/* ═══════════════════════════════════════════════════════════════════
   Velt Premium Theme - Fumadocs Inspired
   A stunning documentation theme with glassmorphism & micro-animations
   ═══════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─────────────────────────────────────────────────────────────────────
   CSS Variables - Light Mode (Default)
   ───────────────────────────────────────────────────────────────────── */
:root {
    /* Background & Surface */
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f4f4f5;
    --bg-glass: rgba(255, 255, 255, 0.8);

    /* Text */
    --text-primary: #18181b;
    --text-secondary: #3f3f46;
    --text-muted: #71717a;
    --text-inverted: #fafafa;

    /* Borders */
    --border-subtle: rgba(0, 0, 0, 0.06);
    --border-default: #e4e4e7;
    --border-strong: #d4d4d8;

    /* Accents */
    --accent-primary: #6366f1;
    --accent-primary-hover: #4f46e5;
    --accent-primary-ghost: rgba(99, 102, 241, 0.1);
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);

    /* Semantic Colors */
    --color-info: #3b82f6;
    --color-info-bg: rgba(59, 130, 246, 0.08);
    --color-info-border: rgba(59, 130, 246, 0.3);
    --color-success: #10b981;
    --color-success-bg: rgba(16, 185, 129, 0.08);
    --color-success-border: rgba(16, 185, 129, 0.3);
    --color-warning: #f59e0b;
    --color-warning-bg: rgba(245, 158, 11, 0.08);
    --color-warning-border: rgba(245, 158, 11, 0.3);
    --color-error: #ef4444;
    --color-error-bg: rgba(239, 68, 68, 0.08);
    --color-error-border: rgba(239, 68, 68, 0.3);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --sidebar-width: 280px;
    --topbar-height: 64px;
    --content-max-width: 820px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─────────────────────────────────────────────────────────────────────
   Dark Mode Override
   ───────────────────────────────────────────────────────────────────── */
html.dark {
    --bg-primary: #09090b;
    --bg-secondary: #0f0f11;
    --bg-tertiary: #18181b;
    --bg-glass: rgba(15, 15, 17, 0.85);

    --text-primary: #fafafa;
    --text-secondary: #d4d4d8;
    --text-muted: #a1a1aa;
    --text-inverted: #18181b;

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: #27272a;
    --border-strong: #3f3f46;

    --accent-primary-ghost: rgba(99, 102, 241, 0.15);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 60px rgba(99, 102, 241, 0.2);
}

/* ─────────────────────────────────────────────────────────────────────
   Base Reset & Defaults
   ───────────────────────────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* ─────────────────────────────────────────────────────────────────────
   Layout Structure
   ───────────────────────────────────────────────────────────────────── */
.layout {
    display: flex;
    min-height: 100vh;
}

/* ─────────────────────────────────────────────────────────────────────
   Sidebar - Glassmorphism Style
   ───────────────────────────────────────────────────────────────────── */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-right: 1px solid var(--border-subtle);
    z-index: 100;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem 1.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    border-bottom: 1px solid var(--border-subtle);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.brand-icon {
    -webkit-text-fill-color: initial;
    font-size: 1.5rem;
}

.brand:hover {
    opacity: 0.8;
    text-decoration: none;
}

/* Mobile menu toggle - hidden on desktop */
.mobile-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 10px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border-color: var(--border-default);
}

.sidebar nav {
    flex: 1;
    padding: 1.25rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
}

/* Navigation sections for directory grouping */
.nav-section {
    margin-top: 1rem;
}

.nav-section-title {
    padding: 0.5rem 0.875rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    opacity: 0.7;
}

.sidebar nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar nav::-webkit-scrollbar-thumb {
    background: var(--border-default);
    border-radius: 4px;
}

.sidebar a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.875rem;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    color: var(--text-muted);
    border-radius: 8px;
    transition: all var(--transition-fast);
    position: relative;
}

.sidebar a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--accent-gradient);
    border-radius: 0 2px 2px 0;
    transition: height var(--transition-fast);
}

.sidebar a:hover {
    color: var(--text-primary);
    background: var(--accent-primary-ghost);
}

.sidebar a.active {
    color: var(--accent-primary);
    background: var(--accent-primary-ghost);
}

.sidebar a.active::before {
    height: 60%;
}

/* ─────────────────────────────────────────────────────────────────────
   Main Content Area
   ───────────────────────────────────────────────────────────────────── */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ─────────────────────────────────────────────────────────────────────
   Top Bar - Glassmorphism Header
   ───────────────────────────────────────────────────────────────────── */
.topbar {
    height: var(--topbar-height);
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    z-index: 50;
}

.search-placeholder {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    min-width: 240px;
    font-size: 0.875rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-placeholder:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.search-placeholder::before {
    content: '⌘K';
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 4px;
    margin-left: auto;
}

#theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 10px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

#theme-toggle:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border-color: var(--border-default);
}

/* Topbar actions container */
.topbar-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Language Switcher */
.lang-switcher {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 10px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border-color: var(--border-default);
}

.lang-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    min-width: 140px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    z-index: 100;
}

.lang-switcher:hover .lang-dropdown {
    display: block;
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.lang-option:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

#theme-toggle:active {
    transform: scale(0.95);
}

html:not(.dark) .sun-icon { display: none; }
html:not(.dark) .moon-icon { display: block; }
html.dark .sun-icon { display: block; }
html.dark .moon-icon { display: none; }

/* ─────────────────────────────────────────────────────────────────────
   Content Area
   ───────────────────────────────────────────────────────────────────── */
.content-area {
    flex: 1;
    width: 100%;
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 3rem 2.5rem;
}

/* ─────────────────────────────────────────────────────────────────────
   Typography Styles
   ───────────────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 {
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 1.875rem;
    margin-top: 3rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-default);
}

h3 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-primary-hover);
    text-decoration: underline;
}

strong, b {
    font-weight: 600;
    color: var(--text-primary);
}

/* ─────────────────────────────────────────────────────────────────────
   Lists
   ───────────────────────────────────────────────────────────────────── */
ul, ol {
    margin: 1rem 0 1.5rem 1.5rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
    padding-left: 0.25rem;
}

li::marker {
    color: var(--accent-primary);
}

/* ─────────────────────────────────────────────────────────────────────
   Code & Pre
   ───────────────────────────────────────────────────────────────────── */
code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    padding: 0.2em 0.4em;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    color: var(--accent-primary);
}

pre {
    margin: 1.5rem 0;
    padding: 1.25rem 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 12px;
    overflow-x: auto;
    box-shadow: var(--shadow-sm);
}

pre code {
    padding: 0;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ─────────────────────────────────────────────────────────────────────
   Callout Components - Beautiful Alert Boxes
   ───────────────────────────────────────────────────────────────────── */
.callout {
    position: relative;
    margin: 1.75rem 0;
    padding: 1.25rem 1.5rem;
    padding-left: 3.5rem;
    background: var(--color-info-bg);
    border: 1px solid var(--color-info-border);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.callout::before {
    content: 'ℹ';
    position: absolute;
    left: 1.25rem;
    top: 1.25rem;
    font-size: 1.25rem;
    line-height: 1;
}

.callout-info {
    background: var(--color-info-bg);
    border-color: var(--color-info-border);
}

.callout-info::before {
    content: '💡';
}

.callout-success {
    background: var(--color-success-bg);
    border-color: var(--color-success-border);
}

.callout-success::before {
    content: '✅';
}

.callout-warning {
    background: var(--color-warning-bg);
    border-color: var(--color-warning-border);
}

.callout-warning::before {
    content: '⚠️';
}

.callout-error, .callout-danger {
    background: var(--color-error-bg);
    border-color: var(--color-error-border);
}

.callout-error::before, .callout-danger::before {
    content: '🚨';
}

/* ─────────────────────────────────────────────────────────────────────
   Custom Component Styles
   ───────────────────────────────────────────────────────────────────── */
.hello-component,
.custom-component {
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--accent-primary-ghost), transparent);
    border: 1px solid var(--border-default);
    border-radius: 12px;
    transition: all var(--transition-base);
}

.hello-component:hover,
.custom-component:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.hello-component h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
    color: var(--accent-primary);
}

.counter {
    display: inline-flex;
    gap: 1.5rem;
    padding: 1rem 1.5rem;
    background: var(--bg-tertiary);
    border-radius: 10px;
    font-family: var(--font-mono);
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: 10px;
    margin: 1rem 0;
}

/* ─────────────────────────────────────────────────────────────────────
   Footer
   ───────────────────────────────────────────────────────────────────── */
footer {
    padding: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
}

footer a {
    font-weight: 600;
}

/* ─────────────────────────────────────────────────────────────────────
   Responsive Design
   ───────────────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }

    .content-area {
        padding: 2rem 1.5rem;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        height: 100vh;
        width: 280px;
        z-index: 1000;
        transition: left var(--transition-slow);
        display: flex;
    }

    .sidebar.open {
        left: 0;
    }

    .sidebar.open::after {
        content: '';
        position: fixed;
        top: 0;
        left: 280px;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .search-placeholder {
        min-width: auto;
        flex: 1;
    }

    .search-placeholder::before {
        display: none;
    }
}

/* ─────────────────────────────────────────────────────────────────────
   Animations & Micro-interactions
   ───────────────────────────────────────────────────────────────────── */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.content-area > * {
    animation: fadeIn 0.4s ease-out forwards;
}

.content-area > *:nth-child(1) { animation-delay: 0.05s; }
.content-area > *:nth-child(2) { animation-delay: 0.1s; }
.content-area > *:nth-child(3) { animation-delay: 0.15s; }
.content-area > *:nth-child(4) { animation-delay: 0.2s; }
.content-area > *:nth-child(5) { animation-delay: 0.25s; }

/* ─────────────────────────────────────────────────────────────────────
   Selection Highlight
   ───────────────────────────────────────────────────────────────────── */
::selection {
    background: var(--accent-primary);
    color: var(--text-inverted);
}

::-moz-selection {
    background: var(--accent-primary);
    color: var(--text-inverted);
}