:root {
    --color-primary: #2856f7;
    --color-primary-dark: #1d3fc7;
    --color-secondary: #0f172a;
    --color-accent: #19b6f3;
    --color-muted: #64748b;
    --color-surface: #ffffff;
    --color-surface-soft: #f3f5fb;
    --color-border: #e2e8f0;
    --radius-lg: 20px;
    --radius-md: 14px;
    --radius-sm: 10px;
    --shadow-sm: 0 12px 32px rgba(15, 23, 42, 0.08);
    --shadow-card: 0 30px 60px rgba(15, 23, 42, 0.12);
    --shadow-hover: 0 20px 50px rgba(40, 86, 247, 0.15);
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
    color: var(--color-secondary);
    background: linear-gradient(135deg, #f8faff 0%, #f0f4ff 100%);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    color: var(--color-primary-dark);
}

.container {
    width: min(1100px, 92vw);
    margin: 0 auto;
}

.site-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(15, 23, 42, 0.06);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow var(--transition-smooth);
}

.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22px 0;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 18px;
    text-decoration: none;
    color: inherit;
}

.brand-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 58px;
    height: 58px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    font-weight: 700;
    letter-spacing: 0.5px;
    box-shadow: 0 8px 24px rgba(40, 86, 247, 0.3);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.brand:hover .brand-mark {
    transform: scale(1.05) rotate(2deg);
    box-shadow: 0 12px 32px rgba(40, 86, 247, 0.4);
}

.brand-copy h1 {
    margin: 0;
    font-size: 1.3rem;
}

.brand-copy p {
    margin: 4px 0 0;
    color: var(--color-muted);
    font-size: 0.95rem;
}

.site-nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    padding: 0;
}

.site-nav a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    color: var(--color-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

.site-nav a::before {
    content: "";
    position: absolute;
    bottom: 6px;
    left: 18px;
    right: 18px;
    height: 2px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--transition-fast);
}

.site-nav a:hover,
.site-nav a:focus {
    background: rgba(40, 86, 247, 0.08);
    color: var(--color-primary);
    transform: translateY(-1px);
}

.site-nav a:hover::before {
    transform: scaleX(1);
}

.site-nav .active {
    background: linear-gradient(135deg, var(--color-secondary), #1a2332);
    color: white;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.2);
}

.site-nav .active::before {
    display: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 12px 28px;
    font-weight: 600;
    border: 1px solid transparent;
    transition: all var(--transition-smooth);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn.primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: 0 18px 30px rgba(40, 86, 247, 0.25);
}

.btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 24px 48px rgba(40, 86, 247, 0.35);
}

.btn.primary:active {
    transform: translateY(-1px);
}

.btn.ghost {
    border: 2px solid rgba(40, 86, 247, 0.4);
    color: var(--color-primary);
    background: transparent;
}

.btn.ghost:hover {
    background: rgba(40, 86, 247, 0.1);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(40, 86, 247, 0.2);
}

.hero {
    padding: 72px 0;
}

.hero-home {
    background: 
        radial-gradient(circle at 20% 30%, rgba(40, 86, 247, 0.1), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(25, 182, 243, 0.08), transparent 50%),
        linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
    position: relative;
    overflow: hidden;
}

.hero-home::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(40, 86, 247, 0.02) 2px, rgba(40, 86, 247, 0.02) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(40, 86, 247, 0.02) 2px, rgba(40, 86, 247, 0.02) 4px);
    pointer-events: none;
}

.hero-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    gap: 48px;
    align-items: center;
}

.hero-text h2 {
    margin-top: 12px;
    font-size: clamp(2rem, 4vw, 2.8rem);
    line-height: 1.2;
}

.hero-text p {
    margin-bottom: 18px;
    color: var(--color-muted);
    max-width: 520px;
}

.eyebrow {
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--color-primary-dark);
    font-size: 0.78rem;
    font-weight: 600;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin: 26px 0;
    flex-wrap: wrap;
}

.hero-metrics {
    display: flex;
    gap: 22px;
    list-style: none;
    margin: 32px 0 0;
    padding: 0;
}

.hero-metrics li {
    background: var(--color-surface-soft);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    min-width: 150px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
    border: 1px solid transparent;
}

.hero-metrics li:hover {
    background: var(--color-surface);
    transform: translateY(-2px);
    box-shadow: 0 16px 40px rgba(40, 86, 247, 0.15);
    border-color: rgba(40, 86, 247, 0.2);
}

.hero-metrics strong {
    display: block;
    font-size: 1.3rem;
    color: var(--color-secondary);
}

.hero-metrics span {
    color: var(--color-muted);
    font-size: 0.85rem;
}

.hero-sidecard {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 32px;
    position: relative;
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.hero-sidecard:hover {
    transform: translateY(-4px);
    box-shadow: 0 40px 80px rgba(15, 23, 42, 0.15);
}

.hero-sidecard h3 {
    margin-top: 0;
}

.hero-sidecard ul {
    list-style: none;
    padding: 0;
    margin: 24px 0 0;
    display: grid;
    gap: 16px;
}

.hero-sidecard li {
    padding-left: 26px;
    position: relative;
    color: var(--color-muted);
}

.hero-sidecard li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary);
}

.section {
    padding: 70px 0;
}

.section-header {
    max-width: 620px;
    margin-bottom: 40px;
}

.section-header h2 {
    margin: 12px 0 18px;
    font-size: clamp(1.8rem, 3vw, 2.2rem);
}

.section-header p {
    margin: 0;
    color: var(--color-muted);
}

.card-grid {
    display: grid;
    gap: 26px;
}

.card-grid.three-col {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transition: transform var(--transition-smooth);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(40, 86, 247, 0.1);
}

.card:hover::before {
    transform: scaleX(1);
}

.card h3 {
    margin-top: 0;
    transition: color var(--transition-fast);
}

.card:hover h3 {
    color: var(--color-primary);
}

.card p {
    color: var(--color-muted);
    margin-bottom: 18px;
}

.link-arrow {
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

.link-arrow:hover {
    color: var(--color-primary);
    gap: 12px;
}

.link-arrow::after {
    content: "→";
    transition: transform var(--transition-fast);
}

.link-arrow:hover::after {
    transform: translateX(6px);
}

.split-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.split-card {
    background: linear-gradient(135deg, rgba(40, 86, 247, 0.08), rgba(25, 182, 243, 0.12));
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.split-card::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.split-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.split-card:hover::before {
    opacity: 1;
}

.bullet-list {
    margin: 24px 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 14px;
}

.bullet-list li {
    padding-left: 22px;
    position: relative;
    color: var(--color-secondary);
}

.bullet-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.stat-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.stat-pills span {
    padding: 10px 20px;
    background: rgba(15, 23, 42, 0.12);
    border-radius: 999px;
    font-weight: 600;
    color: var(--color-secondary);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.stat-pills span:hover {
    background: rgba(40, 86, 247, 0.15);
    color: var(--color-primary);
    transform: translateY(-2px);
    border-color: rgba(40, 86, 247, 0.3);
    box-shadow: 0 4px 12px rgba(40, 86, 247, 0.2);
}

.section-steps .stepper {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 20px;
}

.stepper li {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 20px;
    padding: 22px 24px;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.step-index {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--color-secondary), #1a2332);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.2);
    transition: all var(--transition-smooth);
}

.stepper li:hover .step-index {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 8px 20px rgba(40, 86, 247, 0.3);
}

.stepper li {
    transition: all var(--transition-smooth);
}

.stepper li:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-hover);
}

.testimonial {
    position: relative;
    padding-top: 36px;
    transition: all var(--transition-smooth);
}

.testimonial::before {
    content: "\201C";
    position: absolute;
    top: 10px;
    left: 24px;
    font-size: 3rem;
    color: rgba(40, 86, 247, 0.25);
    transition: all var(--transition-smooth);
}

.testimonial:hover::before {
    color: var(--color-primary);
    transform: scale(1.2);
}

.testimonial:hover {
    background: linear-gradient(135deg, rgba(40, 86, 247, 0.02), rgba(25, 182, 243, 0.02));
}

.testimonial .meta {
    display: block;
    margin-top: 18px;
    font-weight: 600;
    color: var(--color-secondary);
}

.site-footer {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #0a0f1a 100%);
    color: rgba(226, 232, 240, 0.9);
    padding: 48px 0 32px;
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(40, 86, 247, 0.5), transparent);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 18px;
    align-items: center;
}

.footer-title {
    font-weight: 700;
    margin-bottom: 4px;
}

.footer-links {
    display: flex;
    gap: 18px;
}

.footer-contact {
    margin-top: 4px;
    color: rgba(226, 232, 240, 0.9);
}

.footer-links a {
    color: rgba(226, 232, 240, 0.9);
    font-weight: 500;
}

.footer-links a:hover {
    color: white;
}

/* 页面通用布局 */
.hero-page {
    background: linear-gradient(135deg, rgba(25, 182, 243, 0.15), rgba(40, 86, 247, 0.15));
    padding: 80px 0 60px;
}

.hero-page .hero-body {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
}

.hero-page .hero-sidecard {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(8px);
    box-shadow: none;
    border: 1px solid rgba(255, 255, 255, 0.6);
}

.page-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 240px;
    position: relative;
}

.search-input input {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    font-size: 0.95rem;
}

.filter-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.filter-tags button,
.filter-pill {
    border: 2px solid transparent;
    background: rgba(15, 23, 42, 0.08);
    padding: 10px 18px;
    border-radius: 999px;
    font-weight: 500;
    color: var(--color-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-tags button:hover,
.filter-pill:hover {
    background: rgba(40, 86, 247, 0.1);
    color: var(--color-primary);
    transform: translateY(-2px);
    border-color: rgba(40, 86, 247, 0.3);
}

.filter-tags button.active,
.filter-pill.active {
    background: linear-gradient(135deg, var(--color-secondary), #1a2332);
    color: white;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.2);
}

.filter-tags button.active:hover,
.filter-pill.active:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.3);
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.resource-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.resource-card .meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.resource-card .tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.resource-card .tag-list span {
    background: rgba(40, 86, 247, 0.1);
    color: var(--color-primary);
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
}

.contract-samples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 26px;
    margin-top: 32px;
}

.contract-sample {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
    padding: 26px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
    position: relative;
}

.contract-sample:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-left-width: 6px;
    border-left-color: var(--color-accent);
}

.contract-sample h3 {
    margin-top: 0;
    margin-bottom: 16px;
}

.contract-meta {
    color: var(--color-muted);
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.contract-body {
    display: grid;
    gap: 10px;
    color: var(--color-secondary);
    line-height: 1.7;
}

.contract-body strong {
    display: inline-block;
    margin-right: 6px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.data-table thead {
    background: linear-gradient(135deg, rgba(40, 86, 247, 0.1), rgba(25, 182, 243, 0.08));
    text-align: left;
}

.data-table th,
.data-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.92rem;
    transition: background var(--transition-fast);
}

.data-table tbody tr {
    transition: all var(--transition-fast);
}

.data-table tbody tr:hover {
    background: rgba(40, 86, 247, 0.04);
    transform: scale(1.01);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.form-card {
    background: var(--color-surface);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 22px;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-field label {
    font-weight: 600;
}

.form-field input,
.form-field select,
.form-field textarea {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    font-size: 0.95rem;
    resize: vertical;
    min-height: 46px;
    transition: all var(--transition-fast);
    background: var(--color-surface);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(40, 86, 247, 0.1);
    transform: translateY(-1px);
}

.form-field input:hover,
.form-field select:hover,
.form-field textarea:hover {
    border-color: rgba(40, 86, 247, 0.4);
}

.support-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.support-card {
    background: rgba(40, 86, 247, 0.08);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition-smooth);
    border: 1px solid transparent;
}

.support-card:hover {
    background: rgba(40, 86, 247, 0.12);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(40, 86, 247, 0.2);
    border-color: rgba(40, 86, 247, 0.3);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.dashboard-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: all var(--transition-smooth);
    border: 1px solid transparent;
}

.dashboard-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(40, 86, 247, 0.15);
}

.dashboard-card .meta {
    color: var(--color-muted);
    font-size: 0.85rem;
}

.timeline {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 16px;
}

.timeline li {
    padding-left: 24px;
    position: relative;
}

.timeline li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-primary);
}

.empty-state {
    background: var(--color-surface-soft);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    color: var(--color-muted);
}

@media (max-width: 960px) {
    .hero-body {
        grid-template-columns: 1fr;
    }

    .hero-sidecard {
        order: -1;
    }

    .site-nav ul {
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .hero-metrics {
        flex-direction: column;
    }
}

/* Header样式 */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(15, 23, 42, 0.06);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow var(--transition-smooth);
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 0;
    gap: 24px;
}

header h1 {
    margin: 0;
    font-size: 1.4rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

header nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

header nav ul li {
    display: flex;
    align-items: center;
}

header nav a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    color: var(--color-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

header nav a:hover {
    background: rgba(40, 86, 247, 0.08);
    color: var(--color-primary);
    transform: translateY(-1px);
}

header nav .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-border);
    transition: all var(--transition-fast);
    cursor: pointer;
}

header nav .avatar:hover {
    border-color: var(--color-primary);
    transform: scale(1.05);
}

/* Footer样式 */
footer {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #0a0f1a 100%);
    color: rgba(226, 232, 240, 0.9);
    padding: 48px 0 32px;
    position: relative;
    overflow: hidden;
    margin-top: 80px;
}

footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(40, 86, 247, 0.5), transparent);
}

footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 18px;
}

footer p {
    margin: 0;
}

footer ul {
    list-style: none;
    display: flex;
    gap: 18px;
    margin: 0;
    padding: 0;
}

footer a {
    color: rgba(226, 232, 240, 0.9);
    font-weight: 500;
    transition: color var(--transition-fast);
}

footer a:hover {
    color: white;
}

/* Banner/Hero Section */
#banner {
    background: 
        radial-gradient(circle at 20% 30%, rgba(40, 86, 247, 0.1), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(25, 182, 243, 0.08), transparent 50%),
        linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

#banner::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(40, 86, 247, 0.02) 2px, rgba(40, 86, 247, 0.02) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(40, 86, 247, 0.02) 2px, rgba(40, 86, 247, 0.02) 4px);
    pointer-events: none;
}

#banner h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin: 0 0 20px;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#banner p {
    font-size: 1.2rem;
    color: var(--color-muted);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

#banner .buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

#banner .btn {
    padding: 14px 32px;
    font-size: 1rem;
}

/* Features Section */
#features {
    padding: 80px 0;
}

#features h2 {
    text-align: center;
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    margin-bottom: 50px;
}

#features .feature {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
    border: 1px solid transparent;
    text-align: center;
}

#features .feature:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(40, 86, 247, 0.1);
}

#features .feature h3 {
    margin-top: 0;
    color: var(--color-primary);
    font-size: 1.3rem;
}

#features .feature p {
    color: var(--color-muted);
    margin-bottom: 0;
}

/* 登录和注册页面样式 */
#login, #register {
    padding: 80px 0;
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
}

#login .container, #register .container {
    max-width: 500px;
}

#login h2, #register h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 32px;
    color: var(--color-secondary);
}

#login-form, #register-form {
    background: var(--color-surface);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#login-form input, #register-form input,
#login-form textarea, #register-form textarea {
    padding: 14px 18px;
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--color-surface);
    font-family: inherit;
}

#login-form input:focus, #register-form input:focus,
#login-form textarea:focus, #register-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(40, 86, 247, 0.1);
}

#login-form label, #register-form label {
    font-weight: 600;
    color: var(--color-secondary);
    margin-top: 8px;
}

#login-form .btn, #register-form .btn {
    margin-top: 8px;
    width: 100%;
    padding: 14px;
    font-size: 1rem;
}

#login p, #register p {
    text-align: center;
    margin-top: 24px;
    color: var(--color-muted);
}

#login a, #register a {
    color: var(--color-primary);
    font-weight: 600;
}

/* 头像预览 */
#avatar-preview {
    margin-top: 20px;
    text-align: center;
}

#avatar-image {
    max-width: 300px;
    max-height: 300px;
    border-radius: var(--radius-md);
    margin: 0 auto 16px;
    box-shadow: var(--shadow-sm);
}

/* 问答页面样式 */
#qa-showcase {
    padding: 60px 0;
}

#qa-showcase h2 {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    margin-bottom: 32px;
    color: var(--color-secondary);
}

.qa-list {
    display: grid;
    gap: 24px;
    margin-bottom: 32px;
}

.qa-item {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
    border: 1px solid transparent;
    border-left: 4px solid var(--color-primary);
}

.qa-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-left-width: 6px;
    border-left-color: var(--color-accent);
}

.qa-item h3 {
    margin-top: 0;
    margin-bottom: 12px;
}

.qa-item h3 a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.qa-item h3 a:hover {
    color: var(--color-primary);
}

.qa-item p {
    color: var(--color-muted);
    margin-bottom: 0;
    line-height: 1.6;
}

.qa-actions {
    text-align: center;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--color-surface);
    margin: 5% auto;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    width: 90%;
    max-width: 600px;
    position: relative;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-content h2 {
    margin-top: 0;
    margin-bottom: 24px;
    color: var(--color-secondary);
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.modal-content input,
.modal-content textarea {
    padding: 14px 18px;
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--color-surface);
    font-family: inherit;
}

.modal-content input:focus,
.modal-content textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(40, 86, 247, 0.1);
}

.modal-content textarea {
    min-height: 120px;
    resize: vertical;
}

.close {
    color: var(--color-muted);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
    position: absolute;
    right: 20px;
    top: 20px;
}

.close:hover,
.close:focus {
    color: var(--color-secondary);
}

/* 问题详情页面 */
#question-detail {
    padding: 60px 0;
}

#question-detail h2 {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    margin-bottom: 16px;
    color: var(--color-secondary);
}

#question-detail > .container > p {
    color: var(--color-muted);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 32px;
}

.answers {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 2px solid var(--color-border);
}

.answers h3 {
    font-size: 1.5rem;
    margin-bottom: 24px;
    color: var(--color-secondary);
}

#answers-list {
    display: grid;
    gap: 20px;
    margin-bottom: 32px;
}

.answer-item {
    background: var(--color-surface-soft);
    border-radius: var(--radius-md);
    padding: 20px;
    border-left: 4px solid var(--color-accent);
}

.answer-form {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    margin-top: 32px;
}

.answer-form h3 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--color-secondary);
}

.answer-form textarea {
    width: 100%;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    font-size: 1rem;
    min-height: 120px;
    resize: vertical;
    font-family: inherit;
    transition: all var(--transition-fast);
    margin-bottom: 16px;
}

.answer-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(40, 86, 247, 0.1);
}

/* 我的问题页面 */
#my-questions {
    padding: 60px 0;
}

#my-questions h2 {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--color-secondary);
}

#my-questions h2:first-child {
    margin-top: 0;
}

#my-questions p {
    font-size: 1.1rem;
    color: var(--color-muted);
    margin-bottom: 16px;
}

.card-container {
    display: grid;
    gap: 20px;
    margin-bottom: 40px;
}

.card-container .card {
    margin-bottom: 0;
}

.card-container .meta {
    display: flex;
    gap: 20px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    color: var(--color-muted);
    font-size: 0.9rem;
}

.card-container .actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.empty-message {
    text-align: center;
    color: var(--color-muted);
    padding: 40px;
    background: var(--color-surface-soft);
    border-radius: var(--radius-md);
    font-style: italic;
}

/* 通知样式 */
.notification-badge {
    display: inline-block;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 0.75rem;
    line-height: 20px;
    text-align: center;
    font-weight: 600;
    margin-left: 8px;
}

.notification-card {
    position: relative;
    padding-left: 16px;
}

.notification-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--color-accent);
    border-radius: 2px;
}

.notification-card.unread {
    background: rgba(25, 182, 243, 0.05);
}

.notification-time {
    color: var(--color-muted);
    font-size: 0.85rem;
}

/* ========== 首页 V2 布局（参考 U-Choice 智能高考志愿问答平台） ========== */
.site-header-v2 {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 16px rgba(15, 23, 42, 0.06);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    gap: 24px;
    flex-wrap: wrap;
}

.brand-v2 {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #374151;
    letter-spacing: -0.02em;
}

.brand-tagline {
    font-size: 0.8rem;
    color: var(--color-muted);
}

.nav-v2 {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.nav-v2 > a {
    color: var(--color-secondary);
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-v2 > a:hover {
    color: var(--color-primary);
    background: rgba(40, 86, 247, 0.08);
}

.header-search {
    display: flex;
    align-items: center;
    background: #f3f4f6;
    border-radius: var(--radius-md);
    padding: 8px 14px;
    min-width: 180px;
}

.header-search .search-icon {
    font-size: 0.9rem;
    color: var(--color-muted);
    margin-right: 8px;
}

.header-search input {
    border: none;
    background: transparent;
    font-size: 0.9rem;
    width: 100%;
    outline: none;
}

.header-search input::placeholder {
    color: var(--color-muted);
}

.header-search-form {
    display: flex;
    align-items: center;
    background: #f3f4f6;
    border-radius: var(--radius-md);
    padding: 8px 14px;
    min-width: 180px;
}

.header-search-form .search-icon {
    font-size: 0.9rem;
    color: var(--color-muted);
    margin-right: 8px;
}

.header-search-form input {
    border: none;
    background: transparent;
    font-size: 0.9rem;
    width: 100%;
    outline: none;
}

.header-search-form input::placeholder {
    color: var(--color-muted);
}

.header-avatar-wrap {
    flex-shrink: 0;
}

.header-avatar-wrap .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-border);
}

/* Hero V2 */
.hero-v2 {
    position: relative;
    padding: 80px 0 100px;
    text-align: center;
    overflow: hidden;
}

.hero-bg-waves {
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(135deg, rgba(147, 197, 253, 0.25) 0%, transparent 50%),
        linear-gradient(225deg, rgba(196, 181, 253, 0.2) 0%, transparent 50%),
        linear-gradient(180deg, #f8faff 0%, #f0f4ff 100%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 700;
    color: var(--color-primary);
    margin: 0 0 16px;
    line-height: 1.25;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--color-muted);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-buttons .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-smooth);
}

.btn-star {
    font-size: 0.9em;
}

.btn-ask {
    background: linear-gradient(135deg, #7c3aed, #6d28d9);
    color: white;
    border: none;
    box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
}

.btn-ask:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(124, 58, 237, 0.4);
}

.btn-ask .btn-star {
    color: white;
}

.btn-answer {
    background: white;
    color: #7c3aed;
    border: 2px solid #7c3aed;
}

.btn-answer:hover {
    background: rgba(124, 58, 237, 0.08);
    transform: translateY(-2px);
}

.btn-answer .btn-star {
    color: #7c3aed;
}

/* 功能导航 */
.features-nav {
    padding: 60px 0 80px;
}

.features-nav .section-title {
    text-align: left;
    font-size: clamp(1.4rem, 2.5vw, 1.8rem);
    margin: 0 0 28px;
    color: var(--color-secondary);
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    transition: all var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(40, 86, 247, 0.2);
}

.feature-card .card-stars {
    font-size: 1rem;
    color: #d1d5db;
    margin-bottom: 14px;
    letter-spacing: 2px;
}

.feature-card h3 {
    margin: 0 0 6px;
    font-size: 1.2rem;
    color: var(--color-secondary);
}

.feature-card .card-subtitle {
    font-size: 0.85rem;
    color: var(--color-muted);
    margin: 0 0 12px;
}

.feature-card .card-desc {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.55;
    margin: 0 0 16px;
}

.card-icon-placeholder {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #e5e7eb 0%, #d1d5db 100%);
    margin-top: 8px;
}

/* Footer V2 */
.footer-v2 {
    margin-top: 60px;
}

.footer-v2 .footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-v2 .footer-copy {
    margin: 0;
    font-size: 0.9rem;
    color: rgba(226, 232, 240, 0.85);
}

.footer-links-v2 {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 20px;
}

.footer-links-v2 a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: rgba(226, 232, 240, 0.95);
    font-weight: 500;
}

.footer-links-v2 a:hover {
    color: white;
}

.footer-icon {
    font-size: 0.9em;
    opacity: 0.9;
}

/* ========== 问题广场页面布局 ========== */
.plaza-layout {
    display: flex;
    min-height: calc(100vh - 140px);
    max-width: 1280px;
    margin: 0 auto;
    padding: 24px 20px 40px;
    gap: 32px;
}

.plaza-sidebar {
    flex-shrink: 0;
    width: 200px;
}

.sidebar-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0 0 20px;
}

.sidebar-icon {
    font-size: 1rem;
    color: var(--color-primary);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sidebar-btn {
    width: 100%;
    padding: 12px 16px;
    text-align: left;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-secondary);
    background: rgba(147, 197, 253, 0.25);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-btn:hover {
    background: rgba(147, 197, 253, 0.4);
    color: var(--color-primary);
}

.sidebar-btn.active {
    background: var(--color-primary);
    color: white;
}

.plaza-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.plaza-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.plaza-filters {
    display: flex;
    gap: 10px;
}

.filter-select {
    padding: 10px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    font-size: 0.9rem;
    background: var(--color-surface);
    color: var(--color-secondary);
    cursor: pointer;
}

.plaza-search {
    display: flex;
    align-items: center;
    background: #f3f4f6;
    border-radius: var(--radius-md);
    padding: 10px 14px;
    min-width: 200px;
}

.plaza-search .search-icon {
    margin-right: 8px;
    color: var(--color-muted);
}

.plaza-search input {
    border: none;
    background: transparent;
    font-size: 0.9rem;
    width: 100%;
    outline: none;
}

.question-list-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.section-head h3 {
    margin: 0;
    font-size: 1.15rem;
    color: var(--color-secondary);
}

.section-head-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.more-link {
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 500;
}

.more-link:hover {
    text-decoration: underline;
}

.question-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.question-card {
    display: block;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-smooth);
}

.question-card:hover {
    border-color: rgba(40, 86, 247, 0.3);
    box-shadow: 0 8px 24px rgba(40, 86, 247, 0.12);
}

.card-thumb-wrap {
    position: relative;
    margin-bottom: 12px;
}

.card-thumb {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, #e5e7eb 0%, #d1d5db 100%);
}

.card-star {
    position: absolute;
    top: 4px;
    left: 4px;
    font-size: 0.9rem;
    color: #f59e0b;
}

.card-question-title {
    margin: 0 0 12px;
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--color-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.question-card:hover .card-question-title {
    color: var(--color-primary);
}

.card-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.8rem;
    color: var(--color-muted);
}

.card-meta span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.hot-questions-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.hot-questions-section h3 {
    margin: 0 0 16px;
    font-size: 1.15rem;
    color: var(--color-secondary);
}

.hot-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.hot-list li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    border-bottom: 1px solid var(--color-border);
}

.hot-list li:last-child {
    border-bottom: none;
}

.hot-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-secondary);
}

.hot-list a {
    color: var(--color-secondary);
    font-size: 0.95rem;
    text-decoration: none;
}

.hot-list a:hover {
    color: var(--color-primary);
}

.question-grid-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 48px 24px;
    color: var(--color-muted);
    font-size: 1rem;
}

.question-grid-empty a {
    color: var(--color-primary);
    font-weight: 600;
}

.hot-list-empty {
    color: var(--color-muted);
    font-size: 0.9rem;
    list-style: none;
    padding-left: 0;
}

.hot-list-empty::before {
    display: none;
}

.btn-ask {
    background: linear-gradient(135deg, #7c3aed, #6d28d9);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-ask:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
}

a.btn-ask {
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ========== 发布问题页面 ========== */
.ask-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.ask-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 20px 60px;
    position: relative;
}

.ask-bg {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(165deg, rgba(255, 255, 255, 0.95) 0%, transparent 40%),
        linear-gradient(200deg, rgba(147, 197, 253, 0.2) 0%, transparent 45%),
        linear-gradient(260deg, rgba(196, 181, 253, 0.25) 0%, transparent 50%),
        linear-gradient(135deg, #f8faff 0%, #f0f4ff 50%, #e8eeff 100%);
    pointer-events: none;
}

.ask-card {
    position: relative;
    width: 100%;
    max-width: 640px;
    background: var(--color-surface);
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.1), 0 4px 20px rgba(40, 86, 247, 0.06);
    padding: 40px 44px 44px;
}

.ask-help {
    position: absolute;
    top: 24px;
    right: 24px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--color-muted);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.05);
    transition: all var(--transition-fast);
}

.ask-help:hover {
    color: var(--color-primary);
    background: rgba(40, 86, 247, 0.08);
}

.ask-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.ask-row {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ask-row-two {
    flex-direction: row;
    gap: 20px;
}

.ask-row-two .ask-field {
    flex: 1;
    min-width: 0;
}

.ask-field label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: 6px;
}

.ask-field-desc label {
    font-weight: 600;
    margin-bottom: 4px;
}

.ask-hint {
    margin: 0 0 8px;
    font-size: 0.85rem;
    color: var(--color-muted);
    line-height: 1.5;
}

.ask-info {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    margin-left: 6px;
    font-size: 0.85rem;
    color: var(--color-primary);
    background: rgba(40, 86, 247, 0.12);
    border-radius: 50%;
    cursor: help;
    vertical-align: middle;
}

.ask-field-desc label {
    font-size: 0.9rem;
    color: var(--color-muted);
}

.ask-field input,
.ask-field textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: inherit;
    background: #f9fafb;
    color: var(--color-secondary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.ask-field input::placeholder,
.ask-field textarea::placeholder {
    color: var(--color-muted);
}

.ask-field input:focus,
.ask-field textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(40, 86, 247, 0.12);
    background: var(--color-surface);
}

.ask-field textarea {
    resize: vertical;
    min-height: 140px;
}

.ask-actions {
    display: flex;
    justify-content: center;
    margin-top: 12px;
}

.btn-publish {
    padding: 14px 48px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #374151, #1f2937);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-smooth);
    box-shadow: 0 4px 14px rgba(31, 41, 55, 0.25);
}

.btn-publish:hover {
    background: linear-gradient(135deg, #4b5563, #374151);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(31, 41, 55, 0.3);
}

@media (max-width: 640px) {
    .ask-card {
        padding: 28px 20px 32px;
    }

    .ask-row-two {
        flex-direction: column;
        gap: 16px;
    }

    .ask-help {
        position: static;
        margin-bottom: 8px;
        display: inline-block;
    }
}

@media (max-width: 900px) {
    .feature-cards {
        grid-template-columns: 1fr;
    }

    .question-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .plaza-layout {
        flex-direction: column;
        padding: 16px 12px;
    }

    .plaza-sidebar {
        width: 100%;
    }

    .sidebar-nav {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .sidebar-btn {
        width: auto;
        min-width: 100px;
    }

    .question-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-v2 {
        width: 100%;
    }

    .hero-v2 {
        padding: 56px 0 72px;
    }

    .hero-buttons .btn {
        padding: 12px 22px;
        font-size: 0.95rem;
    }
}

.nav-v2 .nav-active {
    color: var(--color-primary);
    font-weight: 600;
}

/* ========== 登录页面 ========== */
.login-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.login-hero {
    flex: 1;
    position: relative;
    min-height: 560px;
    display: flex;
    align-items: center;
    padding: 48px 24px 60px;
    overflow: hidden;
}

.login-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(129, 140, 248, 0.25) 0%, rgba(99, 102, 241, 0.2) 40%, rgba(79, 70, 229, 0.15) 100%);
    pointer-events: none;
}

.login-bg-charts {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(ellipse 80% 60% at 30% 50%, black 0%, transparent 70%);
}

.login-bg-lines {
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 50 Q25 30 50 50 T100 50' stroke='rgba(255,255,255,0.08)' fill='none' stroke-width='1'/%3E%3Cpath d='M0 70 Q50 40 100 70' stroke='rgba(255,255,255,0.06)' fill='none' stroke-width='1'/%3E%3C/svg%3E");
    opacity: 0.8;
    pointer-events: none;
}

.login-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 48px;
    align-items: start;
}

.login-welcome {
    padding-top: 20px;
}

.login-welcome h1 {
    margin: 0 0 12px;
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.login-brand {
    margin: 0 0 28px;
    font-size: 1.25rem;
    font-weight: 600;
    color: rgba(255,255,255,0.95);
}

.login-desc {
    margin: 0 0 16px;
    font-size: 1rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.9);
    max-width: 420px;
}

.login-form-wrap {
    background: var(--color-surface);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.12), 0 4px 20px rgba(0,0,0,0.06);
    padding: 40px 36px 36px;
    width: 100%;
}

.login-form-v2 {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.login-form-v2 .login-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.login-form-v2 .login-field label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-secondary);
}

.login-form-v2 .login-field input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    background: white;
    color: var(--color-secondary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.login-form-v2 .login-field input::placeholder {
    color: var(--color-muted);
}

.login-form-v2 .login-field input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(40, 86, 247, 0.1);
}

.btn-login {
    width: 100%;
    padding: 14px 24px;
    margin-top: 8px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #374151, #1f2937);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 14px rgba(31, 41, 55, 0.25);
}

.btn-login:hover {
    background: linear-gradient(135deg, #4b5563, #374151);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(31, 41, 55, 0.3);
}

.login-links {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 6px;
}

.login-links a {
    font-size: 0.9rem;
    color: var(--color-secondary);
    text-decoration: none;
}

.login-links a:hover {
    color: var(--color-primary);
}

.login-deco {
    position: absolute;
    z-index: 1;
    pointer-events: none;
}

.login-deco-book {
    left: -20px;
    bottom: 80px;
    width: 140px;
    height: 100px;
    background: linear-gradient(145deg, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.15) 100%);
    border-radius: 4px 12px 12px 4px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.login-deco-tablet {
    right: 60px;
    bottom: 60px;
    width: 180px;
    height: 120px;
    background: linear-gradient(160deg, rgba(255,255,255,0.5) 0%, rgba(255,255,255,0.2) 100%);
    border-radius: 12px;
    box-shadow: 0 12px 32px rgba(0,0,0,0.1);
    transform: rotate(-8deg);
}

.login-deco-tablet::before {
    content: "";
    position: absolute;
    inset: 12px;
    background: linear-gradient(180deg, rgba(147, 197, 253, 0.3) 0%, rgba(196, 181, 253, 0.2) 100%);
    border-radius: 6px;
}

@media (max-width: 900px) {
    .login-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .login-welcome {
        padding-top: 0;
    }

    .login-desc {
        max-width: 100%;
    }

    .login-form-wrap {
        max-width: 400px;
        margin: 0 auto;
    }

    .login-deco-tablet {
        right: 20px;
        bottom: 40px;
        width: 120px;
        height: 80px;
    }

    .login-deco-book {
        left: 20px;
        bottom: 40px;
        width: 100px;
        height: 72px;
    }
}

@media (max-width: 640px) {
    .login-hero {
        padding: 24px 16px 40px;
        min-height: 480px;
    }

    .login-form-wrap {
        padding: 28px 24px;
    }
}

/* ========== 问题详情/回答页面 ========== */
.answer-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: #fff;
}

.answer-main {
    flex: 1;
    position: relative;
    padding: 48px 24px 60px;
    overflow: hidden;
}

.answer-bg {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(165deg, transparent 0%, transparent 50%),
        radial-gradient(ellipse 80% 60% at 85% 90%, rgba(147, 197, 253, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse 70% 50% at 90% 85%, rgba(253, 186, 216, 0.15) 0%, transparent 45%),
        radial-gradient(ellipse 60% 40% at 88% 92%, rgba(196, 181, 253, 0.12) 0%, transparent 50%);
    pointer-events: none;
}

.answer-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    margin: 0 auto;
}

.question-brief {
    margin-bottom: 28px;
}

.question-title-text {
    margin: 0;
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    font-weight: 600;
    color: var(--color-secondary);
    line-height: 1.5;
}

.answer-panel {
    background: linear-gradient(180deg, #93c5fd 0%, #7dd3fc 50%, #67c3e8 100%);
    border-radius: 20px;
    box-shadow: 0 16px 48px rgba(59, 130, 246, 0.2), 0 4px 20px rgba(0, 0, 0, 0.06);
    padding: 36px 40px 40px;
}

.btn-claim {
    width: 100%;
    padding: 14px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #374151, #1f2937);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-claim:hover {
    background: linear-gradient(135deg, #4b5563, #374151);
    transform: translateY(-1px);
}

.answer-panel-author-tip {
    padding: 20px 0;
    text-align: center;
}

.answer-panel-author-tip p {
    margin: 0;
    font-size: 1rem;
    color: var(--color-secondary);
    line-height: 1.6;
}

.answer-panel-author-tip a {
    color: var(--color-primary);
    font-weight: 600;
}

.answer-form-v2 {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.answer-form-v2 .answer-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.answer-form-v2 .answer-field label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-secondary);
}

.answer-form-v2 .answer-field input {
    width: 100%;
    max-width: 280px;
    padding: 12px 16px;
    border: 1px solid rgba(255,255,255,0.8);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    background: white;
    color: var(--color-secondary);
}

.answer-form-v2 .answer-field input::placeholder {
    color: var(--color-muted);
}

.answer-form-v2 .answer-field input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(40, 86, 247, 0.15);
}

.answer-field-text label {
    font-weight: 500;
}

.answer-info {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    margin-left: 6px;
    font-size: 0.85rem;
    color: var(--color-secondary);
    background: rgba(255,255,255,0.9);
    border-radius: 50%;
    cursor: help;
    vertical-align: middle;
}

.answer-field-text label {
    font-weight: 600;
    color: var(--color-secondary);
}

.answer-hint {
    margin: 0 0 8px;
    font-size: 0.85rem;
    color: rgba(31, 41, 55, 0.8);
    line-height: 1.5;
}

.answer-form-v2 .answer-field textarea {
    width: 100%;
    min-height: 200px;
    padding: 16px 18px;
    border: 1px solid rgba(255,255,255,0.9);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: inherit;
    background: white;
    color: var(--color-secondary);
    resize: vertical;
}

.answer-form-v2 .answer-field textarea::placeholder {
    color: var(--color-muted);
}

.answer-form-v2 .answer-field textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(40, 86, 247, 0.15);
}

.answer-actions {
    display: flex;
    justify-content: center;
    margin-top: 8px;
}

.btn-send {
    padding: 14px 48px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #374151, #1f2937);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 14px rgba(31, 41, 55, 0.25);
}

.btn-send:hover {
    background: linear-gradient(135deg, #4b5563, #374151);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(31, 41, 55, 0.3);
}

@media (max-width: 640px) {
    .answer-main {
        padding: 24px 16px 40px;
    }

    .answer-panel {
        padding: 24px 20px 28px;
    }
}

/* ========== 回答发布成功页 ========== */
.success-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: #fff;
}

.success-main {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 24px 80px;
    overflow: hidden;
}

.success-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 100% 60% at 50% 100%, rgba(147, 197, 253, 0.12) 0%, transparent 55%),
        radial-gradient(ellipse 80% 40% at 70% 95%, rgba(255, 255, 255, 0.9) 0%, rgba(191, 219, 254, 0.15) 40%, transparent 70%),
        radial-gradient(ellipse 60% 35% at 30% 92%, rgba(224, 231, 255, 0.2) 0%, transparent 60%);
    pointer-events: none;
}

.success-content {
    position: relative;
    z-index: 2;
    max-width: 640px;
    text-align: center;
}

.success-headline {
    margin: 0 0 24px;
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 700;
    color: var(--color-secondary);
    line-height: 1.3;
}

.success-body {
    margin: 0 0 28px;
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-secondary);
}

.success-link {
    font-size: 1rem;
    color: var(--color-primary);
    text-decoration: underline;
    font-weight: 500;
}

.success-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: center;
}

.success-link:hover {
    color: var(--color-primary-dark);
}

.success-link-secondary {
    color: var(--color-muted);
    font-weight: 500;
}

.success-link-secondary:hover {
    color: var(--color-primary);
}

@media (max-width: 960px) {
    .hero-body {
        grid-template-columns: 1fr;
    }

    .hero-sidecard {
        order: -1;
    }

    .site-nav ul {
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .hero-metrics {
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    header nav ul {
        width: 100%;
        justify-content: space-between;
    }

    .hero {
        padding: 56px 0;
    }

    .hero-actions {
        width: 100%;
    }

    .hero-actions .btn {
        flex: 1 1 auto;
        justify-content: center;
    }

    .card,
    .split-card,
    .form-card {
        padding: 22px;
    }

    #login-form, #register-form {
        padding: 28px 20px;
    }

    .modal-content {
        padding: 28px 20px;
        margin: 10% auto;
    }

    #banner {
        padding: 60px 0;
    }
}