:root {
    color-scheme: light;
    --gradient-base: #f8fafc;
    --gradient-accent: #e8f1ff;
    --gradient-edge: #f5f3ff;
    --surface: rgba(255, 255, 255, 0.82);
    --surface-strong: rgba(255, 255, 255, 0.94);
    --border: rgba(148, 163, 184, 0.35);
    --text-strong: #0f172a;
    --text-muted: #475569;
    --header-bg: linear-gradient(135deg, #4c51bf 0%, #6366f1 80%);
    --header-text: #f8fafc;
    --header-hover: rgba(255, 255, 255, 0.85);
    --footer-bg: rgba(15, 23, 42, 0.08);
    --footer-border: rgba(148, 163, 184, 0.45);
    --toggle-bg: rgba(99, 102, 241, 0.2);
    --toggle-handle: #4338ca;
    --link: #4338ca;
    --link-hover: #1e3a8a;
    --shadow-soft: 0 18px 45px -28px rgba(15, 23, 42, 0.4);
    --shadow-strong: 0 30px 70px -40px rgba(15, 23, 42, 0.5);
}

html.dark {
    color-scheme: dark;
    --gradient-base: #020617;
    --gradient-accent: #10172a;
    --gradient-edge: #1e1b4b;
    --surface: rgba(15, 23, 42, 0.82);
    --surface-strong: rgba(15, 23, 42, 0.9);
    --border: rgba(99, 102, 241, 0.35);
    --text-strong: #e2e8f0;
    --text-muted: #94a3b8;
    --header-bg: linear-gradient(135deg, #1e1b4b 0%, #4338ca 65%, #7c3aed 100%);
    --header-text: #e0e7ff;
    --header-hover: #f5f3ff;
    --footer-bg: rgba(15, 23, 42, 0.9);
    --footer-border: rgba(99, 102, 241, 0.4);
    --toggle-bg: rgba(79, 70, 229, 0.35);
    --toggle-handle: #c084fc;
    --link: #a855f7;
    --link-hover: #c4b5fd;
    --shadow-soft: 0 18px 45px -28px rgba(2, 6, 23, 0.75);
    --shadow-strong: 0 30px 70px -45px rgba(15, 23, 42, 0.8);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-strong);
    background: radial-gradient(120% 120% at 10% 10%, var(--gradient-accent) 0%, var(--gradient-edge) 48%, var(--gradient-base) 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background 0.6s ease, color 0.3s ease;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: radial-gradient(180% 180% at 85% 15%, transparent 0%, transparent 55%, rgba(99, 102, 241, 0.08) 100%);
    pointer-events: none;
    z-index: -1;
}

a {
    color: var(--link);
    transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
    color: var(--link-hover);
}

.site-main {
    flex: 1;
    position: relative;
    padding-bottom: 4rem;
}

.site-main::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.35) 0%, rgba(148, 163, 184, 0.2) 30%, transparent 100%);
    opacity: 0.65;
    pointer-events: none;
    z-index: -1;
}

html.dark .site-main::before {
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.65) 0%, rgba(30, 27, 75, 0.35) 45%, transparent 100%);
}

.site-header {
    background: var(--header-bg);
    color: var(--header-text);
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: saturate(140%) blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-soft);
}

.site-header a {
    color: inherit;
}

.site-header a:hover {
    color: var(--header-hover);
}

.site-title a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
}

.site-nav a {
    font-weight: 600;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.site-nav a:hover {
    background-color: rgba(255, 255, 255, 0.12);
    transform: translateY(-1px);
}

@media (max-width: 767px) {
    .site-nav {
        transition: opacity 0.2s ease, transform 0.2s ease, max-height 0.25s ease;
        overflow: hidden;
        max-height: 480px;
        opacity: 1;
        transform: translateY(0);
        visibility: visible;
    }

    .site-nav.mobile-nav-hidden {
        opacity: 0;
        transform: translateY(-12px);
        pointer-events: none;
        max-height: 0;
        visibility: hidden;
    }
}

.site-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--toggle-bg);
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    font-weight: 600;
    color: var(--header-text);
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.site-toggle span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background-color: var(--toggle-handle);
    color: #fff;
    font-size: 0.8rem;
}

.site-toggle:hover {
    background-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 20px -15px rgba(15, 23, 42, 0.65);
}

.site-footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--footer-border);
    color: var(--text-muted);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.site-footer a {
    color: inherit;
}

.site-footer a:hover {
    color: var(--link);
}

.theme-surface {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    box-shadow: var(--shadow-soft);
    backdrop-filter: saturate(140%) blur(18px);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

html.dark .theme-surface {
    box-shadow: var(--shadow-strong);
}

.theme-surface-strong {
    background: var(--surface-strong);
    border: 1px solid var(--border);
    border-radius: 1rem;
    box-shadow: var(--shadow-soft);
    backdrop-filter: saturate(150%) blur(20px);
}

.gradient-divider {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(99, 102, 241, 0.45) 50%, transparent 100%);
    opacity: 0.6;
    margin: 3rem auto;
}

.text-muted {
    color: var(--text-muted);
}

.glass-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    box-shadow: var(--shadow-soft);
    padding: 2rem;
    backdrop-filter: blur(18px) saturate(150%);
}

.floating-panel {
    position: relative;
    overflow: hidden;
}

.floating-panel::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(129, 140, 248, 0.25), transparent 55%);
    opacity: 0.65;
    pointer-events: none;
}

html.dark .floating-panel::before {
    background: radial-gradient(circle at top right, rgba(129, 140, 248, 0.35), transparent 60%);
}

.table-gradient {
    background: var(--surface-strong);
    border: 1px solid var(--border);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

.table-gradient thead {
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.15) 0%, rgba(129, 140, 248, 0.2) 100%);
}

html.dark .table-gradient thead {
    background: linear-gradient(90deg, rgba(79, 70, 229, 0.35) 0%, rgba(124, 58, 237, 0.4) 100%);
}

.table-gradient th,
.table-gradient td {
    border-bottom: 1px solid var(--border);
    padding: 0.85rem 1rem;
}

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

.site-body .alert {
    border-radius: 0.75rem;
    border: 1px solid rgba(99, 102, 241, 0.4);
    box-shadow: var(--shadow-soft);
}

.alert-warning {
    background: linear-gradient(135deg, rgba(254, 240, 138, 0.9) 0%, rgba(253, 224, 71, 0.85) 100%);
    color: #854d0e;
}

.alert-success {
    background: linear-gradient(135deg, rgba(187, 247, 208, 0.92) 0%, rgba(134, 239, 172, 0.9) 100%);
    color: #166534;
    border-color: rgba(22, 101, 52, 0.25);
}

html.dark .alert-success {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.35) 0%, rgba(16, 185, 129, 0.32) 100%);
    color: #bbf7d0;
    border-color: rgba(16, 185, 129, 0.4);
}

.alert-info {
    background: linear-gradient(135deg, rgba(199, 210, 254, 0.9) 0%, rgba(165, 180, 252, 0.86) 100%);
    color: #1e3a8a;
}

html.dark .alert-info {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.42) 0%, rgba(129, 140, 248, 0.46) 100%);
    color: #e0e7ff;
    border-color: rgba(129, 140, 248, 0.45);
}

html.dark .alert-warning {
    background: linear-gradient(135deg, rgba(202, 138, 4, 0.38) 0%, rgba(251, 191, 36, 0.32) 100%);
    color: #fef3c7;
    border-color: rgba(251, 191, 36, 0.45);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    border-radius: 999px;
    font-weight: 700;
    font-size: 1rem;
    color: #fff;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.95) 0%, rgba(79, 70, 229, 0.95) 100%);
    box-shadow: 0 18px 35px -20px rgba(79, 70, 229, 0.7);
    transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
}

.cta-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 20px 40px -20px rgba(79, 70, 229, 0.75);
    opacity: 0.92;
}

html.dark .cta-button {
    background: linear-gradient(135deg, rgba(129, 140, 248, 0.95) 0%, rgba(124, 58, 237, 0.95) 100%);
    box-shadow: 0 20px 40px -25px rgba(30, 27, 75, 0.9);
}

html.dark .cta-button:hover {
    box-shadow: 0 24px 48px -22px rgba(30, 27, 75, 0.95);
}

.code-block {
    background: rgba(15, 23, 42, 0.92);
    color: #f8fafc;
    border-radius: 1rem;
    border: 1px solid rgba(99, 102, 241, 0.35);
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow-soft);
    overflow-x: auto;
    position: relative;
}

.code-block .copy-btn {
    background: rgba(148, 163, 184, 0.18);
    color: #f8fafc;
    border-radius: 999px;
    padding: 0.4rem 0.9rem;
    font-weight: 600;
    transition: background-color 0.18s ease, color 0.18s ease;
}

.code-block .copy-btn:hover {
    background: rgba(129, 140, 248, 0.35);
}

html:not(.dark) .code-block {
    background: rgba(248, 250, 252, 0.92);
    color: #0f172a;
}

html:not(.dark) .code-block code {
    color: inherit;
}

html:not(.dark) .code-block .text-indigo-200,
html:not(.dark) .code-block .text-indigo-300 {
    color: #3730a3 !important;
}

html:not(.dark) .code-block .text-green-200,
html:not(.dark) .code-block .text-green-300 {
    color: #047857 !important;
}

html:not(.dark) .code-block .text-purple-300 {
    color: #7c3aed !important;
}

html:not(.dark) .code-block .text-gray-300 {
    color: #334155 !important;
}

html:not(.dark) .code-block .text-gray-400 {
    color: #475569 !important;
}

.video-embed {
    position: relative;
    padding-top: 56.25%;
    border-radius: 1.25rem;
    overflow: hidden;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-soft);
}

html.dark .video-embed {
    background: rgba(15, 23, 42, 0.85);
    box-shadow: var(--shadow-strong);
}

.video-embed iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
    background-color: transparent;
}

.accordion-panel {
    padding: 1.75rem 2rem;
    transition: background 0.2s ease, box-shadow 0.2s ease;
}

.accordion-panel:hover {
    box-shadow: 0 20px 45px -30px rgba(79, 70, 229, 0.4);
}

.accordion-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    font-size: 1.125rem;
    font-weight: 600;
    background: transparent;
    border: none;
    color: inherit;
    cursor: pointer;
    text-align: left;
    padding: 0;
    gap: 1rem;
}

.accordion-trigger:focus-visible {
    outline: 2px solid rgba(129, 140, 248, 0.45);
    outline-offset: 6px;
}

.accordion-trigger:hover {
    color: var(--link);
}

.accordion-icon {
    width: 1.25rem;
    height: 1.25rem;
    transition: transform 0.2s ease, color 0.2s ease;
}

.accordion-panel.open .accordion-icon {
    transform: rotate(90deg);
}

.accordion-content {
    margin-top: 1.25rem;
    color: var(--text-muted);
}

.accordion-content a {
    color: var(--link);
    font-weight: 600;
}

.accordion-content a:hover {
    color: var(--link-hover);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}