@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* Theme variables */
:root {
    --bg: #f0f2f5;
    --text: #333333;
    --text-muted: #666666;
    --sidebar-bg: #2c3e50;
    --sidebar-text: #ecf0f1;
    --sidebar-link: #bdc3c7;
    --sidebar-hover-bg: #34495e;
    --header-border: #e0e0e0;
    --heading: #2c3e50;
    --subheading: #34495e;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --inline-code-bg: #e9ecef;
    --code-bg: #282c34;
    --code-text: #abb2bf;
    --note-bg: #e7f3fe;
    --note-border: #3498db;
    --copy-btn-bg: #6c757d;
    --copy-btn-hover-bg: #5a6268;
    --copy-btn-success-bg: #28a745;
    --elevation: rgba(0,0,0,0.1);
    --panel: #ffffff;
    --primary: #3498db;
}

/* System dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --text: #e5e7eb;
        --text-muted: #a1a1aa;
        --sidebar-bg: #111827;
        --sidebar-text: #e5e7eb;
        --sidebar-link: #9aa4b2;
        --sidebar-hover-bg: #1f2937;
        --header-border: #222222;
        --heading: #e5e7eb;
        --subheading: #e2e8f0;
        --accent: #60a5fa;
        --accent-hover: #3b82f6;
        --inline-code-bg: #272b33;
        --code-bg: #1f2937;
        --code-text: #e5e7eb;
        --note-bg: #0b1220;
        --note-border: #3b82f6;
        --copy-btn-bg: #3b3f45;
        --copy-btn-hover-bg: #4b5563;
        --copy-btn-success-bg: #22c55e;
        --elevation: rgba(0,0,0,0.4);
        --panel: #1a1a1a;
        --primary: #60a5fa;
    }
}

/* Manual theme overrides */
[data-theme="light"] {
    --bg: #f0f2f5;
    --text: #333333;
    --text-muted: #666666;
    --sidebar-bg: #2c3e50;
    --sidebar-text: #ecf0f1;
    --sidebar-link: #bdc3c7;
    --sidebar-hover-bg: #34495e;
    --header-border: #e0e0e0;
    --heading: #2c3e50;
    --subheading: #34495e;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --inline-code-bg: #e9ecef;
    --code-bg: #282c34;
    --code-text: #abb2bf;
    --note-bg: #e7f3fe;
    --note-border: #3498db;
    --copy-btn-bg: #6c757d;
    --copy-btn-hover-bg: #5a6268;
    --copy-btn-success-bg: #28a745;
    --elevation: rgba(0,0,0,0.1);
    --panel: #ffffff;
    --primary: #3498db;
}

[data-theme="dark"] {
    --bg: #0f1115;
    --text: #e5e7eb;
    --text-muted: #a1a1aa;
    --sidebar-bg: #111827;
    --sidebar-text: #e5e7eb;
    --sidebar-link: #9aa4b2;
    --sidebar-hover-bg: #1f2937;
    --header-border: #222222;
    --heading: #e5e7eb;
    --subheading: #e2e8f0;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --inline-code-bg: #272b33;
    --code-bg: #1f2937;
    --code-text: #e5e7eb;
    --note-bg: #0b1220;
    --note-border: #3b82f6;
    --copy-btn-bg: #3b3f45;
    --copy-btn-hover-bg: #4b5563;
    --copy-btn-success-bg: #22c55e;
    --elevation: rgba(0,0,0,0.4);
    --panel: #1a1a1a;
    --primary: #60a5fa;
}

/* Mathematical constants for perfect proportions */
:root {
    --phi: 1.618; /* Golden ratio */
    --phi-inverse: 0.618;
    --sqrt2: 1.414;
    --sqrt3: 1.732;
    
    /* Perfect mathematical spacing scale based on golden ratio */
    --space-xs: calc(var(--phi-inverse) * 1rem); /* ~10px */
    --space-sm: 1rem; /* 16px */
    --space-md: calc(var(--phi) * 1rem); /* ~26px */
    --space-lg: calc(var(--phi) * var(--phi) * 1rem); /* ~42px */
    --space-xl: calc(var(--phi) * var(--phi) * var(--phi) * 1rem); /* ~68px */
    --space-2xl: calc(var(--phi) * var(--phi) * var(--phi) * var(--phi) * 1rem); /* ~110px */
    
    /* Mathematical typography scale */
    --text-xs: calc(1rem / var(--phi) / var(--phi)); /* ~10px */
    --text-sm: calc(1rem / var(--phi)); /* ~12px */
    --text-base: 1rem; /* 16px */
    --text-lg: calc(1rem * var(--phi-inverse) + 1rem); /* ~20px */
    --text-xl: calc(1rem * var(--phi)); /* ~26px */
    --text-2xl: calc(1rem * var(--phi) * var(--phi-inverse) + 1rem); /* ~32px */
    --text-3xl: calc(1rem * var(--phi) * var(--phi)); /* ~42px */
    --text-4xl: calc(1rem * var(--phi) * var(--phi) * var(--phi-inverse) + 1rem); /* ~52px */
}

/* Base styles with mathematical precision */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    line-height: var(--phi); /* Golden ratio line height */
    margin: 0;
    padding: 0;
    background-color: var(--bg);
    color: var(--text);
    font-size: var(--text-base);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    cursor: default;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
    box-sizing: border-box;
}

.container.grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
    min-height: 100vh;
}

.page-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
    box-sizing: border-box;
}

.section {
    padding: var(--space-2xl) 0; /* ~110px - golden ratio based */
}

.section-sm {
    padding: var(--space-xl) 0; /* ~68px - golden ratio based */
}

.section-lg {
    padding: calc(var(--space-2xl) * var(--phi)) 0; /* ~178px - extended golden ratio */
}

body {
    padding-top: 120px; /* Account for floating navbar */
}

/* Navigation styles */
.navbar {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    backdrop-filter: saturate(180%) blur(24px);
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    border: 1px solid color-mix(in srgb, var(--header-border) 30%, transparent);
    border-radius: 24px;
    padding: 8px 16px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 32px color-mix(in srgb, var(--elevation) 15%, transparent),
                0 0 0 1px color-mix(in srgb, var(--accent) 5%, transparent);
    max-width: 800px;
    width: calc(100vw - 48px);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 0;
    max-width: none;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    font-family: 'Inter', sans-serif;
    font-size: 1.25rem;
    transition: all 0.3s ease;
    padding: 8px 12px;
    border-radius: 16px;
}

.navbar-brand:hover {
    transform: scale(1.02) translateY(-1px);
    background: linear-gradient(135deg, var(--accent-hover), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    list-style: none;
    margin: 0;
    padding: 4px;
    background: color-mix(in srgb, var(--accent) 8%, transparent);
    border-radius: 20px;
    border: 1px solid color-mix(in srgb, var(--accent) 15%, transparent);
}

.navbar-nav .nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
    padding: 10px 18px;
    border-radius: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.navbar-nav .nav-link:hover {
    background-color: color-mix(in srgb, var(--accent) 12%, transparent);
    color: var(--accent);
    transform: translateY(-1px) scale(1.02);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 20%, transparent);
}

.navbar-nav .nav-link.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: white;
    font-weight: 600;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 30%, transparent);
}

.navbar-toggle {
    display: none;
}

/* Theme toggle removed - using system-only theme detection */

/* Sidebar styles */
.sidebar {
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    border-radius: 12px;
    padding: 12px;
    border: 1px solid var(--header-border);
    position: sticky;
    top: 90px;
    align-self: start;
    max-height: calc(100vh - 110px);
    overflow: auto;
    box-shadow: none;
}

.sidebar h2 {
    font-family: 'Lato', sans-serif;
    color: var(--sidebar-text);
    margin-top: 0;
    margin-bottom: 30px;
    font-size: 1.8rem;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 15px;
}

.sidebar a {
    color: var(--sidebar-link);
    text-decoration: none;
    display: block;
    padding: 12px 15px;
    border-radius: 5px;
    transition: all 0.3s ease-in-out, transform 0.2s ease;
    font-size: 0.95rem;
}

.sidebar a:hover, .sidebar a.active {
    background-color: var(--sidebar-hover-bg);
    color: #fff;
    padding-left: 20px;
    transform: translateX(3px);
    cursor: pointer;
}

/* Main content styles */
.main-content {
    margin-left: 0;
    padding: 0 0 24px;
    width: 100%;
    box-sizing: border-box;
}

/* Header styles */
header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: saturate(180%) blur(10px);
    background: color-mix(in srgb, var(--bg) 86%, transparent);
    border-bottom: 1px solid var(--header-border);
    padding: 10px 0;
}

header h1 {
    font-family: 'Lato', sans-serif;
    font-size: 3rem;
    margin-bottom: 10px;
    color: var(--heading);
}

header p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* Section styles */
section {
    margin-bottom: 50px;
    padding-top: 70px;
    margin-top: -70px;
    position: relative;
    transition: all 0.3s ease;
}

section:hover {
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}

section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-hover));
    transition: width 0.3s ease;
}

section:hover::after {
    width: 100%;
}

/* Heading styles */
h1 {
    font-family: 'Inter', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--heading);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

h2 {
    font-family: 'Inter', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--heading);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-top: 0;
    margin-bottom: 24px;
}

h3 {
    font-family: 'Inter', sans-serif;
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--subheading);
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin-top: 32px;
    margin-bottom: 16px;
}

h4 {
    font-family: 'Inter', sans-serif;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--heading);
    line-height: 1.4;
    margin-top: 24px;
    margin-bottom: 12px;
}

.display-1 {
    font-size: calc(var(--text-4xl) * var(--phi)); /* ~84px - golden ratio scaled */
    font-weight: 900;
    line-height: calc(1 / var(--phi-inverse)); /* ~1.11 - mathematical precision */
    letter-spacing: calc(-0.03em * var(--phi-inverse));
    margin-bottom: var(--space-md);
}

.display-2 {
    font-size: var(--text-4xl); /* ~52px - mathematically derived */
    font-weight: 800;
    line-height: calc(var(--phi) / var(--sqrt2)); /* ~1.14 */
    letter-spacing: calc(-0.02em * var(--phi-inverse));
    margin-bottom: var(--space-sm);
}

.text-lg {
    font-size: var(--text-lg); /* ~20px - golden ratio based */
    line-height: calc(var(--phi) + 0.1); /* ~1.72 */
}

.text-xl {
    font-size: var(--text-xl); /* ~26px - golden ratio based */
    line-height: var(--phi); /* Perfect golden ratio */
}

.font-medium {
    font-weight: 500;
}

.font-semibold {
    font-weight: 600;
}

.font-bold {
    font-weight: 700;
}

/* Code styles */
code {
    background-color: var(--inline-code-bg);
    padding: 0.25em 0.5em;
    margin: 0;
    font-size: 0.875rem;
    border-radius: 6px;
    font-family: 'JetBrains Mono', 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-weight: 500;
}

pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: var(--space-sm);
    border-radius: calc(var(--space-xs) + 2px); /* ~12px */
    overflow-x: auto;
    position: relative;
    margin-top: var(--space-sm);
    margin-bottom: var(--space-md);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--elevation) 12%, transparent);
    border: 1px solid var(--header-border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
    font-size: var(--text-sm);
    line-height: var(--phi);
}

pre:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px color-mix(in srgb, var(--elevation) 20%, transparent);
    border-color: color-mix(in srgb, var(--primary) 50%, var(--header-border));
}

pre:hover .copy-btn {
    opacity: 0.9;
    transform: translateY(-1px) scale(1);
    transition-delay: 0.1s;
}

pre code {
    background: none;
    padding: 0;
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Copy button styles */
.copy-btn {
    position: absolute;
    top: var(--space-xs);
    right: var(--space-xs);
    background: color-mix(in srgb, var(--panel) 85%, transparent);
    border: 1px solid color-mix(in srgb, var(--header-border) 60%, transparent);
    border-radius: calc(var(--space-xs) * 0.75); /* ~8px */
    padding: calc(var(--space-xs) * 0.6) var(--space-xs);
    color: var(--text-muted);
    cursor: pointer;
    font-size: calc(var(--text-sm) * 0.9);
    font-weight: 500;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    user-select: none;
    display: flex;
    align-items: center;
    gap: calc(var(--space-xs) * 0.5);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: 0.01em;
    opacity: 0.7;
    z-index: 10;
    min-height: 32px;
    box-shadow: 0 2px 8px color-mix(in srgb, var(--elevation) 8%, transparent);
    transform: translateY(-1px) scale(0.95);
}

.copy-btn:hover {
    background: color-mix(in srgb, var(--panel) 95%, var(--primary));
    border-color: color-mix(in srgb, var(--primary) 30%, transparent);
    transform: translateY(-1px) scale(1.02);
    opacity: 1;
    color: var(--primary);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--primary) 15%, transparent);
}

.copy-btn:active {
    transform: translateY(0) scale(0.98);
    transition-duration: 0.1s;
}

.copy-btn.copied {
    background: color-mix(in srgb, #22c55e 20%, var(--panel));
    border-color: color-mix(in srgb, #22c55e 40%, transparent);
    color: #22c55e;
    transform: scale(1.05);
    animation: success-pulse 0.6s ease-out;
}

.copy-btn:focus {
    outline: 2px solid color-mix(in srgb, var(--primary) 60%, transparent);
    outline-offset: 2px;
    opacity: 1;
    transform: translateY(-1px) scale(1.02);
}

.copy-btn:focus:not(:focus-visible) {
    outline: none;
}

@keyframes success-pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 2px 8px color-mix(in srgb, var(--elevation) 8%, transparent);
    }
    50% {
        transform: scale(1.08);
        box-shadow: 0 8px 24px color-mix(in srgb, #22c55e 25%, transparent);
    }
    100% {
        transform: scale(1.05);
        box-shadow: 0 4px 16px color-mix(in srgb, #22c55e 20%, transparent);
    }
}

/* Note styles */
.note {
    background-color: var(--note-bg);
    border-left: 6px solid var(--note-border);
    padding: 20px;
    margin: 30px 0;
    border-radius: 5px;
    color: var(--heading);
}

.note p {
    margin: 0;
    font-size: 0.95rem;
}

/* List styles */
ul, ol {
    margin-left: 20px;
    margin-bottom: 20px;
}

ul li, ol li {
    margin-bottom: 8px;
}

/* Link styles */
a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s, transform 0.2s ease;
    cursor: pointer;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
    transform: translateY(-1px);
}

/* Template header and layout */
html {
    scroll-behavior: smooth;
}

.bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: 1px solid var(--header-border);
    border-radius: 12px;
    background: var(--panel);
    color: var(--heading);
    cursor: pointer;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn:hover {
    box-shadow: 0 6px 24px var(--elevation);
    background-color: var(--accent);
    color: white;
    transform: translateY(-2px);
}

.btn-primary {
    background-color: var(--accent);
    color: white;
    border-color: var(--accent);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
}

.icon {
    width: 18px;
    height: 18px;
    opacity: 0.8;
}

.search {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border: 1px solid var(--header-border);
    border-radius: 12px;
    background: var(--panel);
}

.search input {
    flex: 1;
    background: transparent;
    border: 0;
    outline: 0;
    color: var(--heading);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: 0.2px;
    color: var(--heading);
}

.pill {
    font-size: 12px;
    border: 1px solid var(--header-border);
    padding: 4px 8px;
    border-radius: 999px;
    color: var(--text-muted);
}

.layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 24px;
    padding: 24px 0;
}

/* Sidebar refinements */
nav.sidebar {
    border: 1px solid var(--header-border);
    background: var(--panel);
    border-radius: 12px;
    height: calc(100dvh - 120px);
    overflow: auto;
}

nav .section {
    padding: 14px 16px;
    border-bottom: 1px dashed var(--header-border);
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.12em;
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 8px;
}

.nav-item {
    margin: 2px 0;
}

.nav-link {
    display: block;
    padding: 10px;
    border-radius: 10px;
    color: var(--heading);
}

.nav-link:hover {
    background: color-mix(in srgb, var(--accent) 14%, transparent);
}

.nav-link.active {
    background: color-mix(in srgb, var(--accent) 22%, transparent);
}

/* Sidebar and content search inputs */
.sidebar .search, .content-search {
    width: calc(100% - 24px);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border: 1px solid var(--header-border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--heading);
    margin: 8px 12px;
    position: relative;
    z-index: 1;
}

.sidebar .search input, .content-search input {
    flex: 1;
    border: 0;
    outline: 0;
    background: transparent;
    color: inherit;
    font-size: 13px;
    pointer-events: auto;
    user-select: text;
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    padding: 0;
    margin: 0;
    transition: all 0.3s ease;
}

.search input:focus, .content-search input:focus {
    transform: scale(1.02);
    box-shadow: 0 0 0 3px rgba(106,165,255,0.1);
}

.search-results {
    list-style: none;
    margin: 8px 0 0;
    padding: 0;
    max-height: 250px;
    overflow-y: auto;
    border: 1px solid var(--header-border);
    border-radius: 8px;
    background: var(--panel);
    width: calc(100% - 24px);
    margin-left: 12px;
}

.search-results li {
    padding: 8px 12px;
    border-bottom: 1px solid var(--header-border);
    margin: 0;
    transition: background-color 0.2s ease;
}

.search-results li:last-child {
    border-bottom: none;
}

.search-results li:hover {
    background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.search-results a {
    color: var(--heading);
    text-decoration: none;
    display: block;
    font-weight: 500;
}

.search-results a:hover {
    text-decoration: underline;
}

.search-results mark {
    background-color: var(--primary);
    color: white;
    padding: 1px 3px;
    border-radius: 3px;
    font-weight: 600;
}

.no-results {
    padding: 16px;
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
}

/* Folder Card Styles */
.folder-card {
    background: var(--panel);
    border: 1px solid var(--header-border);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px color-mix(in srgb, var(--elevation) 8%, transparent);
}

.folder-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 12%, transparent);
    transform: translateY(-1px);
}

.folder-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 6%, transparent), color-mix(in srgb, var(--accent) 3%, transparent));
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 1px solid color-mix(in srgb, var(--header-border) 50%, transparent);
}

.folder-header:hover {
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 10%, transparent), color-mix(in srgb, var(--accent) 5%, transparent));
}

.folder-icon {
    color: var(--accent);
    display: flex;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    filter: drop-shadow(0 2px 4px color-mix(in srgb, var(--accent) 20%, transparent));
}

.folder-card.expanded .folder-icon {
    transform: rotate(12deg) scale(1.1);
    color: var(--accent-hover);
}

.folder-title {
    color: var(--heading);
    font-size: 15px;
    font-weight: 700;
    margin: 0;
    flex: 1;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    font-size: 12px;
}

.folder-toggle {
    color: var(--text-muted);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    opacity: 0.7;
}

.folder-toggle:hover {
    opacity: 1;
    color: var(--accent);
}

.folder-card.expanded .folder-toggle .chevron {
    transform: rotate(180deg);
    color: var(--accent);
}

.folder-content {
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--bg);
    opacity: 0;
    visibility: hidden;
    padding: 0;
    margin: 0;
}

.folder-card.expanded .folder-content {
    max-height: 800px;
    opacity: 1;
    visibility: visible;
    padding: 0;
}

.folder-content .nav-list {
    border-left: 3px solid color-mix(in srgb, var(--accent) 15%, transparent);
    margin: 0;
    padding: 8px 0 8px 20px;
    background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 2%, transparent), transparent);
}

.folder-content .nav-link {
    color: var(--text);
    padding: 10px 16px;
    font-size: 13px;
    border-left: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
    margin: 2px 8px;
}

.folder-content .nav-link:hover {
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    color: var(--accent);
    transform: translateX(8px);
    border-left: 3px solid var(--accent);
}

.folder-content .nav-link.active {
    background: var(--accent);
    color: white;
    transform: translateX(8px);
    box-shadow: 0 2px 8px color-mix(in srgb, var(--accent) 25%, transparent);
    border-left: 3px solid var(--accent-hover);
    font-weight: 600;
}

/* Professional hover effects */
.nav-link, .btn, .tab {
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link::before, .btn::before, .tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s ease;
}

.nav-link:hover::before, .btn:hover::before, .tab:hover::before {
    left: 100%;
}

.nav-link:hover, .btn:hover, .tab:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.nav-link:active, .btn:active, .tab:active {
    transform: translateY(0);
    transition: transform 0.1s ease;
}

/* Brand logo images with automatic light/dark switching */
.brand-logo {
    width: 28px;
    height: 28px;
    display: block;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.brand-logo:hover {
    transform: rotate(5deg) scale(1.1);
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
}

.logo-dark {
    display: none;
}

.logo-light {
    display: block;
}

@media (prefers-color-scheme: dark) {
    .logo-light {
        display: none;
    }
    .logo-dark {
        display: block;
    }
}

[data-theme="light"] .logo-light { display: block; }
[data-theme="light"] .logo-dark { display: none; }
[data-theme="dark"] .logo-light { display: none; }
[data-theme="dark"] .logo-dark { display: block; }

/* Modern Card System */
.card {
    background: var(--panel);
    border: 1px solid color-mix(in srgb, var(--header-border) 40%, transparent);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card:hover {
    border-color: color-mix(in srgb, var(--accent) 30%, transparent);
    box-shadow: 0 20px 40px color-mix(in srgb, var(--elevation) 60%, transparent);
    transform: translateY(-2px);
}

.card-lg {
    padding: 48px;
}

.card-sm {
    padding: 24px;
}

/* Modern Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: 1px solid color-mix(in srgb, var(--header-border) 60%, transparent);
    border-radius: 12px;
    background: var(--panel);
    color: var(--heading);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn:hover {
    border-color: var(--accent);
    background: var(--accent);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 10px 30px color-mix(in srgb, var(--accent) 30%, transparent);
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 12px 35px color-mix(in srgb, var(--accent) 40%, transparent);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 600;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

/* Hero Section */
.hero {
    position: relative;
    text-align: center;
    padding: 120px 24px 100px;
    background: linear-gradient(135deg, 
        color-mix(in srgb, var(--accent) 3%, var(--bg)) 0%,
        var(--bg) 50%,
        color-mix(in srgb, var(--accent) 5%, var(--bg)) 100%
    );
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, color-mix(in srgb, var(--accent) 8%, transparent) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, color-mix(in srgb, var(--accent) 6%, transparent) 0%, transparent 50%);
    pointer-events: none;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--heading), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .subtitle {
    font-size: 1.3rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.feature-card {
    background: var(--panel);
    border: 1px solid var(--header-border);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s ease;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    border-color: var(--accent);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.feature-card p {
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

.feature-card .btn {
    margin-top: 10px;
}

/* Project card styles */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.project-card {
    background: var(--panel);
    border: 1px solid var(--header-border);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    border-color: var(--accent);
}

.project-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(45deg, var(--accent), var(--accent-hover));
}

.project-card-content {
    padding: 25px;
}

.project-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--heading);
}

.project-card p {
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

/* Blog styles */
.blog-post {
    background: var(--panel);
    border: 1px solid var(--header-border);
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 30px;
    transition: all 0.3s ease;
}

.blog-post:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(0,0,0,0.1);
    border-color: var(--accent);
}

.blog-post h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    border: none;
    padding: 0;
}

.blog-post h2 a {
    color: var(--heading);
}

.blog-post h2 a:hover {
    color: var(--accent);
}

.blog-post .meta {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.blog-post .excerpt {
    color: var(--text);
    margin-bottom: 20px;
    line-height: 1.6;
}

/* Contact form styles */
.contact-form {
    max-width: 600px;
    margin: 40px auto;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--heading);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--header-border);
    border-radius: 8px;
    background: var(--panel);
    color: var(--text);
    font-size: 16px;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Responsive adjustments */
@media (max-width: 1200px) {
    .page-container {
        padding: 0 20px;
    }
    
    .navbar {
        max-width: 700px;
    }
    
    .hero {
        padding: 100px 24px 80px;
    }
}

@media (max-width: 1000px) {
    .layout {
        grid-template-columns: 1fr;
    }
    
    nav.sidebar {
        position: fixed;
        inset: 64px 0 0 auto;
        width: min(88%, 320px);
        max-width: 92vw;
        transform: translateX(110%);
        transition: 0.25s transform ease;
        box-shadow: 0 10px 30px var(--elevation);
    }
    
    nav.sidebar.open {
        transform: translateX(0);
    }
    
    .scrim {
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        display: none;
    }
    
    .scrim.show {
        display: block;
    }
    
    .navbar-nav {
        display: none;
    }
}

@media (max-width: 992px) {
    .container.grid {
        grid-template-columns: 1fr;
    }
    
    .page-container {
        padding: 0 20px;
    }
    
    .main-content {
        padding: 0 0 24px;
    }
    
    .display-1 {
        font-size: 3rem;
    }
    
    .display-2 {
        font-size: 2.5rem;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    h3 {
        font-size: 1.5rem;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-sm {
        padding: 40px 0;
    }
    
    .section-lg {
        padding: 80px 0;
    }
    
    .hero {
        padding: 80px 20px 60px;
    }
    
    .card-lg {
        padding: 32px;
    }
    
    .btn-lg {
        padding: 14px 28px;
        font-size: 15px;
    }
}

@media (max-width: 768px) {
    .container.grid {
        grid-template-columns: 1fr;
    }
    
    .page-container {
        padding: 0 16px;
    }
    
    .navbar {
        top: 16px;
        left: 16px;
        right: 16px;
        width: calc(100vw - 32px);
        transform: none;
        border-radius: 20px;
    }
    
    .navbar .container {
        padding: 0 8px;
        gap: 16px;
    }
    
    .navbar-brand {
        font-size: 1.1rem;
        padding: 6px 10px;
    }
    
    .navbar-nav {
        position: fixed;
        top: 90px;
        left: 16px;
        right: 16px;
        background: color-mix(in srgb, var(--bg) 95%, transparent);
        backdrop-filter: saturate(180%) blur(24px);
        flex-direction: column;
        padding: 16px;
        gap: 8px;
        border-radius: 20px;
        border: 1px solid color-mix(in srgb, var(--header-border) 30%, transparent);
        box-shadow: 0 8px 32px color-mix(in srgb, var(--elevation) 20%, transparent);
        transform: translateY(-150vh);
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 999;
    }
    
    .navbar-nav.show {
        transform: translateY(0);
    }
    
    .navbar-nav .nav-link {
        padding: 14px 20px;
        color: var(--text);
        border-radius: 16px;
        font-size: 14px;
        font-weight: 600;
        text-align: center;
        width: 100%;
        box-sizing: border-box;
    }
    
    .navbar-nav .nav-link:hover {
        background: color-mix(in srgb, var(--accent) 12%, transparent);
        color: var(--accent);
        transform: scale(1.02);
    }
    
    .navbar-nav .nav-link.active {
        background: linear-gradient(135deg, var(--accent), var(--accent-hover));
        color: white;
        transform: scale(1.02);
    }
    
    .navbar-toggle {
        display: flex;
        flex-direction: column;
        justify-content: center;
        width: 32px;
        height: 32px;
        background: color-mix(in srgb, var(--accent) 10%, transparent);
        border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
        border-radius: 12px;
        cursor: pointer;
        padding: 6px;
        transition: all 0.3s ease;
    }
    
    .navbar-toggle:hover {
        background: color-mix(in srgb, var(--accent) 15%, transparent);
        transform: scale(1.05);
    }
    
    .navbar-toggle span {
        display: block;
        height: 2px;
        width: 100%;
        background: var(--accent);
        margin: 2px 0;
        border-radius: 2px;
        transition: all 0.3s ease;
    }
    
    .navbar-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(4px, 4px);
    }
    
    .navbar-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .navbar-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .sidebar {
        position: static;
        top: auto;
        max-height: none;
        padding: 12px;
    }
    
    .sidebar h2 {
        text-align: left;
        border-bottom: none;
        padding-bottom: 0;
        margin-bottom: 20px;
    }
    
    .sidebar a {
        padding: 10px 15px;
    }
    
    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 20px;
    }
    
    .display-1 {
        font-size: 2.5rem;
    }
    
    .display-2 {
        font-size: 2rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
    
    h3 {
        font-size: 1.3rem;
    }
    
    .section {
        padding: 40px 0;
    }
    
    .section-sm {
        padding: 30px 0;
    }
    
    .section-lg {
        padding: 60px 0;
    }
    
    .hero {
        padding: 60px 16px 50px;
    }
    
    .card {
        padding: 24px;
    }
    
    .card-lg {
        padding: 24px;
    }
    
    .btn-lg {
        padding: 12px 24px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .navbar {
        top: 12px;
        left: 12px;
        right: 12px;
        width: calc(100vw - 24px);
        border-radius: 16px;
        padding: 6px 12px;
    }
    
    .navbar-brand {
        font-size: 1rem;
        padding: 6px 8px;
    }
    
    .navbar-nav .nav-link {
        padding: 8px 14px;
        font-size: 12px;
    }
    
    .display-1 {
        font-size: 2.2rem;
    }
    
    .display-2 {
        font-size: 1.8rem;
    }
    
    .hero {
        padding: 50px 12px 40px;
    }
    
    .page-container {
        padding: 0 12px;
    }
    
    .card {
        padding: 20px;
    }
    
    .card-lg {
        padding: 20px;
    }
    
    .btn {
        font-size: 13px;
        padding: 10px 16px;
    }
    
    .btn-lg {
        font-size: 13px;
        padding: 11px 20px;
    }
}
        padding: 12px 24px;
        font-size: 14px;
    }
}

/* Ripple animation */
@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}