:root {
    --bg: #f5f7fb;
    --surface: rgba(255, 255, 255, 0.84);
    --surface-strong: #ffffff;
    --surface-muted: #eef2f7;
    --border: rgba(15, 23, 42, 0.08);
    --border-strong: rgba(15, 23, 42, 0.14);
    --text: #111827;
    --text-soft: #4b5563;
    --text-faint: #6b7280;
    --accent: #2563eb;
    --accent-soft: rgba(37, 99, 235, 0.12);
    --success: #0f766e;
    --success-soft: rgba(15, 118, 110, 0.12);
    --warning: #b45309;
    --warning-soft: rgba(180, 83, 9, 0.12);
    --danger: #b42318;
    --danger-soft: rgba(180, 35, 24, 0.12);
    --shadow: 0 18px 50px rgba(15, 23, 42, 0.07);
    --radius-lg: 24px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --container: 1120px;
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: light;
}

body {
    margin: 0;
    font-family: "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(37, 99, 235, 0.09), transparent 26%),
        radial-gradient(circle at top right, rgba(15, 118, 110, 0.08), transparent 24%),
        linear-gradient(180deg, #f8fafc 0%, #f5f7fb 100%);
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

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

button,
input,
textarea,
select {
    font: inherit;
}

.site-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.trial-banner {
    background: linear-gradient(90deg, rgba(180, 83, 9, 0.16), rgba(37, 99, 235, 0.12));
    border-bottom: 1px solid rgba(180, 83, 9, 0.18);
}

.trial-banner__inner {
    width: min(calc(100% - 32px), var(--container));
    margin: 0 auto;
    padding: 12px 0;
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    color: var(--warning);
}

.trial-banner__inner strong {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
}

.trial-banner__inner a {
    color: var(--accent);
    font-weight: 600;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(16px);
    background: rgba(245, 247, 251, 0.8);
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.site-header__inner,
.page,
.site-footer {
    width: min(calc(100% - 32px), var(--container));
    margin: 0 auto;
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 18px 0;
    position: relative;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}

.brand__mark {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f172a, #334155);
    color: white;
    font-weight: 700;
    letter-spacing: 0.08em;
}

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

.brand__text strong {
    font-size: 1rem;
}

.brand__text small {
    color: var(--text-faint);
}

.site-header__menu,
.site-nav,
.site-header__actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.site-header__menu {
    flex: 1;
    justify-content: flex-end;
    gap: 16px;
}

.site-nav a,
.user-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 14px;
    border-radius: 999px;
    color: var(--text-soft);
}

.site-nav a:hover,
.site-nav a:focus-visible {
    background: rgba(255, 255, 255, 0.72);
    color: var(--text);
}

.user-badge {
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid var(--border);
}

.mobile-nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.mobile-nav-button {
    display: none;
    width: 48px;
    height: 48px;
    border-radius: 16px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--border);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
    cursor: pointer;
}

.mobile-nav-button span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: var(--text);
    transition: transform 0.18s ease, opacity 0.18s ease;
}

.inline-form {
    margin: 0;
}

.page {
    flex: 1;
    padding: 34px 0 56px;
}

.messages {
    display: grid;
    gap: 12px;
    margin-bottom: 24px;
}

.message {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.86);
    color: var(--text-soft);
}

.message--success {
    background: var(--success-soft);
    border-color: rgba(15, 118, 110, 0.18);
    color: var(--success);
}

.message--error {
    background: var(--danger-soft);
    border-color: rgba(180, 35, 24, 0.18);
    color: var(--danger);
}

.message--warning {
    background: var(--warning-soft);
    border-color: rgba(180, 83, 9, 0.18);
    color: var(--warning);
}

.hero,
.panel,
.auth-card,
.empty-state,
.detail-section,
.content-card,
.error-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    backdrop-filter: blur(14px);
}

.hero,
.panel,
.detail-section,
.content-card,
.error-card {
    padding: 28px;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.9fr);
    gap: 24px;
    margin-bottom: 24px;
}

.hero__eyebrow,
.section-heading__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
}

.hero h1,
.section-heading h1,
.section-heading h2,
.content-card h1,
.content-card h2,
.auth-card h1,
.error-card h1 {
    margin: 16px 0 12px;
    line-height: 1.15;
}

.hero h1 {
    font-size: clamp(2rem, 4vw, 3.5rem);
}

.hero p,
.section-heading p,
.meta,
.content-text,
.supporting-text,
.empty-state p,
.error-card p {
    color: var(--text-soft);
    line-height: 1.75;
}

.hero__actions,
.page-actions,
.card-actions,
.stack-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.button,
button,
input[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    appearance: none;
    border: none;
    border-radius: 999px;
    padding: 12px 18px;
    background: var(--text);
    color: white;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
    box-shadow: 0 10px 24px rgba(17, 24, 39, 0.12);
}

.button:hover,
button:hover,
input[type="submit"]:hover {
    transform: translateY(-1px);
}

.button--secondary {
    background: white;
    color: var(--text);
    border: 1px solid var(--border-strong);
    box-shadow: none;
}

.button--ghost {
    background: rgba(255, 255, 255, 0.72);
    color: var(--text);
    border: 1px solid var(--border);
    box-shadow: none;
}

.hero__stats,
.stats-grid,
.card-grid,
.answer-list,
.image-grid {
    display: grid;
    gap: 16px;
}

.hero__stats,
.stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-card,
.list-card,
.answer-card,
.image-card {
    background: var(--surface-strong);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.stat-card {
    padding: 18px;
}

.stat-card strong {
    display: block;
    font-size: 2rem;
    line-height: 1;
    margin-bottom: 10px;
}

.stat-card span {
    color: var(--text-faint);
}

.section-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.section-heading h1,
.section-heading h2 {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.supporting-text {
    margin: 0;
}

.card-grid,
.answer-list {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.list-card,
.answer-card {
    padding: 22px;
}

.list-card h3,
.answer-card h3 {
    margin: 0 0 10px;
    font-size: 1.1rem;
}

.collection-card h3,
.collection-section h4 {
    margin: 0 0 8px;
}

.list-card__meta,
.detail-meta,
.answer-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    color: var(--text-faint);
    font-size: 0.95rem;
    margin-bottom: 14px;
}

.detail-meta--spaced {
    margin-top: 24px;
}

.list-card__summary {
    color: var(--text-soft);
    line-height: 1.7;
    margin: 0 0 18px;
}

.page-stack,
.detail-stack {
    display: grid;
    gap: 24px;
}

.guide-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
    gap: 24px;
    align-items: start;
}

.guide-image-card,
.guide-secondary {
    padding: 18px;
    border-radius: var(--radius-md);
    background: var(--surface-strong);
    border: 1px solid var(--border);
}

.guide-image-card img,
.guide-secondary img {
    width: 100%;
    border-radius: 18px;
    border: 1px solid var(--border);
}

.guide-copy,
.guide-points {
    display: grid;
    gap: 18px;
}

.guide-point {
    padding: 20px 22px;
    border-radius: var(--radius-md);
    background: var(--surface-strong);
    border: 1px solid var(--border);
}

.guide-point h3,
.guide-secondary h3 {
    margin: 0 0 10px;
}

.guide-point p,
.guide-secondary p {
    margin: 0;
    color: var(--text-soft);
    line-height: 1.75;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.dashboard-list {
    display: grid;
    gap: 12px;
}

.dashboard-list__item {
    display: grid;
    gap: 6px;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    background: var(--surface-muted);
    border: 1px solid var(--border);
}

.dashboard-list__item span {
    color: var(--text-faint);
    font-size: 0.95rem;
}

.detail-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.85fr);
    gap: 24px;
}

.content-text {
    white-space: normal;
}

.image-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    margin-top: 18px;
}

.image-card {
    overflow: hidden;
}

.image-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.auth-wrap {
    display: flex;
    justify-content: center;
    padding: 28px 0;
}

.auth-card {
    width: min(100%, 560px);
    padding: 32px;
}

.form-block p {
    margin: 0 0 18px;
}

.form-block label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-block input[type="text"],
.form-block input[type="password"],
.form-block input[type="email"],
.form-block input[type="file"],
.form-block textarea,
.form-block select {
    width: 100%;
    padding: 14px 16px;
    border-radius: 16px;
    border: 1px solid var(--border-strong);
    background: rgba(255, 255, 255, 0.96);
    color: var(--text);
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.form-block textarea {
    min-height: 160px;
    resize: vertical;
}

.form-block input:focus,
.form-block textarea:focus,
.form-block select:focus {
    outline: none;
    border-color: rgba(37, 99, 235, 0.55);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.form-block .helptext,
.form-help,
.subtle-note {
    display: block;
    margin-top: 8px;
    color: var(--text-faint);
    font-size: 0.95rem;
    line-height: 1.6;
}

.form-block ul.errorlist {
    list-style: none;
    padding: 0;
    margin: 0 0 10px;
    color: var(--danger);
}

.form-block ul {
    list-style: none;
    padding: 0;
    margin: 8px 0 0;
}

.form-block ul li + li {
    margin-top: 10px;
}

.form-block input[type="checkbox"] {
    width: auto;
    margin-right: 10px;
}

.form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.empty-state,
.error-card {
    text-align: center;
    padding: 36px 28px;
}

.site-footer {
    padding: 0 0 32px;
}

.site-footer p {
    margin: 0;
    text-align: center;
    color: var(--text-faint);
}

.search-bar {
    display: flex;
    gap: 12px;
    align-items: center;
    margin: 0 0 22px;
    flex-wrap: wrap;
}

.search-bar__field {
    flex: 1 1 320px;
}

.search-bar__field input {
    width: 100%;
    padding: 14px 16px;
    border-radius: 16px;
    border: 1px solid var(--border-strong);
    background: rgba(255, 255, 255, 0.96);
}

.screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.keyword-panel {
    margin: 0 0 18px;
    padding: 14px 16px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: var(--surface-muted);
}

.keyword-panel summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    cursor: pointer;
    color: var(--text-soft);
    font-weight: 600;
}

.keyword-summary,
.keyword-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.keyword-list {
    margin-top: 14px;
}

.keyword-list--spaced {
    margin: 0 0 20px;
}

.keyword-chip,
.keyword-count {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--accent);
    font-size: 0.9rem;
}

.keyword-count {
    background: rgba(15, 23, 42, 0.08);
    color: var(--text-soft);
}

.keyword-filter-panel {
    margin: 0 0 24px;
    padding: 20px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--border);
}

.keyword-filter-list,
.overview-list {
    display: grid;
    gap: 12px;
}

.keyword-filter-list {
    grid-template-columns: repeat(auto-fit, minmax(140px, max-content));
}

.keyword-filter-chip {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 12px 16px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--border);
    color: var(--text-soft);
}

.keyword-filter-chip strong {
    font-size: 0.92rem;
    color: var(--accent);
}

.keyword-filter-chip--active {
    background: var(--accent-soft);
    border-color: rgba(37, 99, 235, 0.16);
    color: var(--accent);
}

.overview-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 22px;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: var(--surface-strong);
}

.overview-item h3 {
    margin: 0 0 6px;
}

.overview-item__actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.overview-count {
    display: inline-flex;
    align-items: center;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.08);
    color: var(--text);
    font-weight: 600;
}

.section-heading--compact {
    margin-bottom: 14px;
}

.favorite-trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 18px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--border);
    color: var(--text);
}

.favorite-trigger--active {
    background: rgba(245, 158, 11, 0.16);
    border-color: rgba(245, 158, 11, 0.26);
    color: #b45309;
}

.favorite-modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 50;
    padding: 20px;
}

.favorite-modal:target {
    display: flex;
}

.favorite-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.38);
}

.favorite-modal__card {
    position: relative;
    width: min(100%, 580px);
    max-height: calc(100vh - 40px);
    overflow: auto;
    padding: 28px;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--border);
    box-shadow: 0 24px 80px rgba(15, 23, 42, 0.18);
}

.favorite-modal__close {
    font-size: 1.6rem;
    line-height: 1;
    color: var(--text-faint);
}

.favorite-collections,
.collection-items {
    display: grid;
    gap: 10px;
}

.favorite-collection-option,
.collection-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--border);
}

.collection-card {
    padding: 24px;
    border-radius: 22px;
    background: var(--surface-strong);
    border: 1px solid var(--border);
}

.collection-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.collection-section {
    padding: 20px;
    border-radius: 18px;
    background: rgba(245, 247, 251, 0.92);
    border: 1px solid var(--border);
}

.collection-item {
    flex-direction: column;
    align-items: flex-start;
}

.collection-item span {
    color: var(--text-faint);
    font-size: 0.95rem;
}

@media (max-width: 960px) {
    .site-header__inner,
    .section-heading,
    .hero,
    .detail-layout,
    .guide-layout {
        grid-template-columns: 1fr;
        flex-direction: column;
        align-items: stretch;
    }

    .site-header__inner {
        display: grid;
    }

    .site-header__menu {
        justify-content: flex-start;
    }

    .hero__stats,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .search-bar {
        align-items: stretch;
    }

    .overview-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .dashboard-grid,
    .collection-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .site-header__inner,
    .page,
    .site-footer {
        width: min(calc(100% - 20px), var(--container));
    }

    .hero,
    .panel,
    .detail-section,
    .content-card,
    .auth-card,
    .empty-state,
    .error-card {
        padding: 22px;
        border-radius: 20px;
    }

    .brand__text small {
        display: none;
    }

    .site-header__inner {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: center;
        gap: 14px;
    }

    .mobile-nav-button {
        display: inline-flex;
        justify-self: end;
    }

    .site-header__menu {
        display: none;
        grid-column: 1 / -1;
        width: 100%;
        margin-top: 2px;
        padding: 14px;
        border-radius: 20px;
        background: rgba(255, 255, 255, 0.94);
        border: 1px solid var(--border);
        box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
        flex-direction: column;
        align-items: stretch;
        gap: 14px;
    }

    .mobile-nav-toggle:checked + .mobile-nav-button + .site-header__menu {
        display: flex;
    }

    .mobile-nav-toggle:checked + .mobile-nav-button span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .mobile-nav-toggle:checked + .mobile-nav-button span:nth-child(2) {
        opacity: 0;
    }

    .mobile-nav-toggle:checked + .mobile-nav-button span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .site-nav,
    .site-header__actions {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .site-nav a,
    .user-badge,
    .button,
    button,
    input[type="submit"] {
        width: 100%;
        justify-content: center;
        text-align: center;
    }

    .site-nav a,
    .user-badge {
        padding: 12px 14px;
        border-radius: 14px;
        background: rgba(245, 247, 251, 0.96);
        border: 1px solid var(--border);
    }

    .site-header__actions > * {
        flex: 1 1 100%;
    }
}