/* =========================================================
   Navigation theme — slate + teal, formal / technical
   Loaded after style.css to refine the live & export home.
   ========================================================= */

:root {
    --nav-bg: #edf1f6;
    --nav-surface: #ffffff;
    --nav-surface-2: #f7fafc;
    --nav-ink: #0f172a;
    --nav-muted: #64748b;
    --nav-line: rgba(15, 23, 42, 0.08);
    --nav-accent: #0f766e;
    --nav-accent-2: #14b8a6;
    --nav-accent-soft: rgba(15, 118, 110, 0.12);
    --nav-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
    --nav-radius: 14px;
    --nav-font: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --nav-display: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

[data-bs-theme="dark"] {
    --nav-bg: #0b1220;
    --nav-surface: #121a2b;
    --nav-surface-2: #182235;
    --nav-ink: #e8eef8;
    --nav-muted: #94a3b8;
    --nav-line: rgba(148, 163, 184, 0.16);
    --nav-accent: #2dd4bf;
    --nav-accent-2: #5eead4;
    --nav-accent-soft: rgba(45, 212, 191, 0.14);
    --nav-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
}

body {
    font-family: var(--nav-font);
    background-color: transparent;
    color: var(--nav-ink);
}

/* ---------- Top bar ---------- */
.nav-shell {
    position: sticky;
    top: 0;
    z-index: 1040;
    background: color-mix(in srgb, var(--nav-surface) 86%, transparent) !important;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--nav-line);
    box-shadow: none !important;
    padding: 0.55rem 0.75rem;
}

.nav-shell.scrolled {
    box-shadow: var(--nav-shadow) !important;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--nav-ink) !important;
    text-decoration: none;
    font-family: var(--nav-display);
}

.brand-glyph {
    width: 2.1rem;
    height: 2.1rem;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: linear-gradient(145deg, var(--nav-accent), #115e59);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18);
    font-size: 0.95rem;
}

.brand-text {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    line-height: 1.1;
}

.nav-actions .btn-nav,
.nav-actions .btn-nav-ghost,
.nav-actions .btn-nav-icon {
    border-radius: 10px;
    border: 1px solid var(--nav-line);
    background: var(--nav-surface-2);
    color: var(--nav-ink);
    font-size: 0.85rem;
    padding: 0.35rem 0.8rem;
    transition: border-color 0.25s ease, background 0.25s ease, color 0.25s ease, transform 0.2s ease;
}

.nav-actions .btn-nav:hover,
.nav-actions .btn-nav-ghost:hover,
.nav-actions .btn-nav-icon:hover {
    border-color: var(--nav-accent);
    color: var(--nav-accent);
    background: var(--nav-accent-soft);
    transform: translateY(-1px);
}

.nav-actions .btn-nav-icon {
    width: 2.2rem;
    height: 2.2rem;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ---------- Sidebar ---------- */
.layout-shell {
    min-height: calc(100vh - 64px);
}

.sidebar {
    background: color-mix(in srgb, var(--nav-surface) 92%, transparent) !important;
    border-right: 1px solid var(--nav-line);
    box-shadow: none !important;
    min-height: calc(100vh - 64px);
}

.sidebar-inner {
    padding: 1.25rem 0.4rem 2rem;
}

.sidebar-label {
    text-align: center;
    font-size: 0.95rem;
    letter-spacing: 0.2em;
    color: var(--nav-ink);
    margin-bottom: 1.1rem;
    font-weight: 700;
    opacity: 0.92;
}

.sidebar .list-group-item {
    color: color-mix(in srgb, var(--nav-ink) 78%, var(--nav-muted));
    border-radius: 12px !important;
    margin: 0.25rem 0.3rem;
    border-left: none !important;
    padding: 0.95rem 0.4rem;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    line-height: 1.25;
}

.sidebar .list-group-item span {
    display: block;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar .list-group-item i {
    color: var(--nav-accent);
    margin-bottom: 0.4rem;
    font-size: 1.25rem;
    opacity: 0.95;
}

.sidebar .list-group-item:hover {
    background: var(--nav-accent-soft);
    color: var(--nav-accent);
}

.sidebar .list-group-item:hover i {
    color: var(--nav-accent);
}

.sidebar .list-group-item.active {
    background: linear-gradient(180deg, var(--nav-accent-soft), transparent) !important;
    color: var(--nav-accent) !important;
    border-left: none !important;
    font-weight: 700;
}

.sidebar .list-group-item.active i {
    color: var(--nav-accent) !important;
}

.sidebar .list-group-item.active::after {
    left: 50%;
    top: auto;
    bottom: 6px;
    transform: translateX(-50%);
    width: 28%;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--nav-accent), var(--nav-accent-2));
}

/* ---------- Hero ---------- */
.main-panel {
    position: relative;
}

.hero-section {
    position: relative;
    isolation: isolate;
    min-height: 0;
    padding: clamp(1.5rem, 3.5vh, 2.5rem) 1.25rem 1.1rem;
    text-align: center;
    overflow: hidden;
    border-bottom: 1px solid var(--nav-line);
}

.hero-atmosphere {
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, var(--nav-accent-soft), transparent 60%),
        linear-gradient(180deg, color-mix(in srgb, var(--nav-surface) 70%, transparent), transparent 80%);
    pointer-events: none;
}

.hero-atmosphere::after {
    content: none;
}

.hero-section > canvas {
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 820px;
    margin: 0 auto;
    animation: heroRise 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes heroRise {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-brand {
    margin: 0 0 0.45rem;
    font-family: var(--nav-display);
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    line-height: 1.05;
    color: var(--nav-ink);
    text-shadow: none;
}

.hero-title {
    font-size: clamp(1.05rem, 2.2vw, 1.35rem) !important;
    font-weight: 500 !important;
    min-height: 0 !important;
    color: var(--nav-muted) !important;
    letter-spacing: 0.01em;
    margin-bottom: 0.4rem !important;
}

.typewriter-cursor {
    color: var(--nav-accent) !important;
}

.hero-subtitle {
    font-size: 0.98rem !important;
    color: var(--nav-muted) !important;
    max-width: 36rem;
    margin: 0 auto 1rem !important;
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
}

.hero-search {
    max-width: 720px;
    margin: 0 auto;
    animation: heroRise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.12s both;
}

.widget-rail {
    margin-top: 0.85rem !important;
    padding-top: 0.15rem;
}

.search-shell {
    background: var(--nav-surface);
    border: 1px solid var(--nav-line);
    border-radius: 16px !important;
    overflow: hidden;
    box-shadow: var(--nav-shadow) !important;
}

.search-shell .input-group-text,
.search-shell .form-control,
.search-shell .form-select {
    background: transparent !important;
    color: var(--nav-ink) !important;
    box-shadow: none !important;
}

.search-shell .input-group-text {
    color: var(--nav-accent) !important;
}

.search-shell .form-control::placeholder {
    color: color-mix(in srgb, var(--nav-muted) 80%, transparent);
}

.search-engine-selector {
    background: transparent !important;
}

.search-engine-selector::before {
    background: var(--nav-line) !important;
}

#engine-select {
    background-color: transparent !important;
    color: var(--nav-muted) !important;
}

#search-button {
    background: linear-gradient(145deg, var(--nav-accent), #0d9488) !important;
    color: #fff !important;
    border: none !important;
    border-radius: 0 !important;
    padding-inline: 1.4rem !important;
    font-weight: 600;
    letter-spacing: 0.06em;
    animation: none !important;
}

#search-button:hover {
    filter: brightness(1.05);
    animation: none !important;
}

.input-group:focus-within {
    box-shadow: 0 0 0 3px var(--nav-accent-soft), var(--nav-shadow) !important;
    transform: none !important;
}

/* Hide legacy sticky search strip (search moved into hero) */
.search-section {
    display: none !important;
}

/* ---------- Content / cards ---------- */
.widget-rail,
#content-area {
    position: relative;
    z-index: 1;
}

.widget-section-title {
    color: var(--nav-ink);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.widget-section-title i {
    color: var(--nav-accent);
    margin-right: 0.4rem;
}

.category-title {
    color: var(--nav-ink) !important;
    font-weight: 700 !important;
    letter-spacing: 0.02em;
    margin-top: 2rem !important;
}

.category-title::after {
    background: linear-gradient(90deg, var(--nav-accent), transparent) !important;
    height: 2px !important;
    width: 72px !important;
}

.site-card.card,
.card.site-card,
#content-area .card {
    background: var(--nav-surface) !important;
    border: 1px solid var(--nav-line) !important;
    border-radius: var(--nav-radius) !important;
    box-shadow: none !important;
    transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease !important;
}

#content-area .card:hover,
.site-card:hover {
    border-color: color-mix(in srgb, var(--nav-accent) 55%, var(--nav-line)) !important;
    background: linear-gradient(180deg, var(--nav-surface), var(--nav-surface-2)) !important;
    box-shadow: var(--nav-shadow) !important;
}

#content-area .card::before,
.site-card::before {
    display: none;
}

.card-icon-small {
    background: var(--nav-accent-soft) !important;
    border-radius: 12px !important;
}

.card-icon-small i {
    color: var(--nav-accent) !important;
}

.card-title {
    color: var(--nav-ink) !important;
    font-weight: 600;
}

.card-text {
    color: var(--nav-muted) !important;
}

/* Tone down noisy effects from legacy style.css */
#search-button:hover {
    animation: none !important;
}

.card:hover .card-icon-small {
    transform: translateY(-2px) scale(1.04);
}

.card:hover .card-icon-small i {
    animation: none;
}

@media (max-width: 768px) {
    .hero-section {
        min-height: 0;
        padding: 1.35rem 1rem 0.85rem;
    }

    .widget-rail {
        margin-top: 0.65rem !important;
    }

    .hero-brand {
        font-size: 2rem;
        letter-spacing: 0.04em;
    }

    .brand-text {
        font-size: 1.05rem;
    }

    .nav-actions .btn-nav span,
    .nav-actions .btn-nav {
        font-size: 0.8rem;
    }

    .sidebar {
        min-height: auto;
        border-right: none;
        border-bottom: 1px solid var(--nav-line);
    }

    .sidebar-inner {
        padding: 0.75rem 0.25rem;
    }

    .sidebar-label {
        display: none;
    }

    .sidebar .list-group {
        display: flex;
        flex-direction: row;
        overflow-x: auto;
        gap: 0.25rem;
    }

    .sidebar .list-group-item {
        flex: 0 0 auto;
        min-width: 4.5rem;
        margin: 0;
    }
}