/* ===================================
   VLSI Verification - Global Styles
   Premium Dark/Light Theme Design
   =================================== */

/* CSS Variables */
:root {
    /* Colors - Light Mode */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #06b6d4;
    --accent: #f59e0b;

    /* Backgrounds - Warm off-white/beige tones */
    --bg-primary: #faf8f5;
    --bg-secondary: #f5f2ed;
    --bg-tertiary: #ebe7e0;
    --bg-card: #fdfcfa;

    /* Text */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;

    /* Borders */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-secondary: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    --gradient-dark: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

    /* Code Colors */
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
    --code-keyword: #c084fc;
    --code-string: #4ade80;
    --code-function: #60a5fa;
    --code-comment: #64748b;
    --code-class: #fbbf24;
    --code-macro: #f472b6;
    --code-type: #2dd4bf;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Spacing */
    --container-max: 1280px;
    --section-padding: 100px;
    --nav-height: 80px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #64748b;

    --border-color: #334155;
    --border-light: #1e293b;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 60px rgba(99, 102, 241, 0.25);
}

/* ===================================
   Reset & Base Styles
   =================================== */

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===================================
   Navigation
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .navbar {
    background: rgba(15, 23, 42, 0.85);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.4rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-accent {
    color: var(--primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 10px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    transform: scale(1.05);
}

.sun-icon,
.moon-icon {
    font-size: 1.2rem;
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.hamburger,
.hamburger::before,
.hamburger::after {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    padding-top: var(--nav-height);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.hero-gradient {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 120%;
    background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

[data-theme="dark"] .hero-gradient {
    background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.25) 0%, transparent 70%);
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border-light) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-light) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 80%);
}

[data-theme="dark"] .hero-grid {
    background-image:
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    opacity: 0.2;
}

.hero-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 60px 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 20px 8px 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    animation: slideUp 0.6s ease;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    animation: blink 2s ease-in-out infinite;
}

@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    animation: slideUp 0.6s ease 0.1s both;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
    animation: slideUp 0.6s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    animation: slideUp 0.6s ease 0.3s both;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

.btn-arrow {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

.hero-stats {
    display: flex;
    gap: 48px;
    animation: slideUp 0.6s ease 0.4s both;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Hero Visual - Code Window */
.hero-visual {
    animation: slideUp 0.6s ease 0.3s both;
}

.code-window {
    background: var(--code-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: transform var(--transition-normal);
}

.code-window:hover {
    transform: perspective(1000px) rotateY(0) rotateX(0);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: #0f172a;
    border-bottom: 1px solid #334155;
}

.code-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background: #ef4444;
}

.dot.yellow {
    background: #f59e0b;
}

.dot.green {
    background: #10b981;
}

.code-title {
    font-size: 0.85rem;
    color: #64748b;
    font-family: 'Fira Code', monospace;
}

.code-content {
    padding: 24px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
    overflow-x: auto;
    color: var(--code-text);
}

.code-content .keyword {
    color: var(--code-keyword);
}

.code-content .class-name {
    color: var(--code-class);
}

.code-content .function {
    color: var(--code-function);
}

.code-content .string {
    color: var(--code-string);
}

.code-content .macro {
    color: var(--code-macro);
}

.code-content .type {
    color: var(--code-type);
}

.code-content .comment {
    color: var(--code-comment);
    font-style: italic;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    animation: fadeIn 1s ease 1s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--primary);
    border-radius: 2px;
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }

    50% {
        transform: translateX(-50%) translateY(12px);
        opacity: 0.5;
    }
}

/* ===================================
   Section Styles
   =================================== */

section {
    padding: var(--section-padding) 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-label {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.section-cta {
    text-align: center;
    margin-top: 48px;
}

/* ===================================
   Features Section
   =================================== */

.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===================================
   Blog Section
   =================================== */

.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.blog-card.featured {
    grid-column: span 2;
    flex-direction: row;
}

.blog-image {
    position: relative;
    background: var(--gradient-primary);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.blog-card.featured .blog-image {
    min-width: 400px;
    min-height: 100%;
}

.blog-image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
}

.blog-icon {
    font-size: 4rem;
    opacity: 0.8;
}

.blog-category {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--primary-dark);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.blog-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.blog-meta {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.blog-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
}

.blog-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    flex-grow: 1;
}

.blog-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.tag {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
}

.blog-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.blog-link svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.blog-link:hover svg {
    transform: translateX(4px);
}

/* ===================================
   Tutorials Section
   =================================== */

.tutorials {
    background: var(--bg-secondary);
}

.tutorials-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.tutorial-track {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.track-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: var(--gradient-primary);
    color: white;
}

.track-icon {
    font-size: 2rem;
}

.track-info {
    flex-grow: 1;
}

.track-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.track-description {
    font-size: 0.9rem;
    opacity: 0.9;
}

.track-lessons {
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
}

.track-modules {
    padding: 16px;
}

.module {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.module:hover {
    background: var(--bg-tertiary);
}

.module-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-tertiary);
}

.module-content {
    flex-grow: 1;
}

.module-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.module-content p {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.module-status {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
}

.module-status.completed {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.module-status.current {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
}

.track-cta {
    display: block;
    text-align: center;
    padding: 20px;
    color: var(--primary);
    font-weight: 600;
    border-top: 1px solid var(--border-color);
    transition: background var(--transition-fast);
}

.track-cta:hover {
    background: rgba(99, 102, 241, 0.05);
}

/* ===================================
   AMBA Section
   =================================== */

.amba-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.protocol-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.protocol-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.protocol-header {
    padding: 32px 24px;
    text-align: center;
    position: relative;
}

.protocol-card.axi .protocol-header {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
}

.protocol-card.ahb .protocol-header {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1) 0%, rgba(14, 165, 233, 0.1) 100%);
}

.protocol-card.apb .protocol-header {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(52, 211, 153, 0.1) 100%);
}

.protocol-badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.protocol-card.ahb .protocol-badge {
    background: #0891b2;
}

.protocol-card.apb .protocol-badge {
    background: #059669;
}

.protocol-name {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.protocol-full-name {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.protocol-features {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.protocol-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    font-size: 0.95rem;
}

.feature-icon {
    font-size: 1.1rem;
}

.protocol-topics {
    padding: 24px;
}

.protocol-topics h4 {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.protocol-topics ul {
    list-style: none;
}

.protocol-topics li {
    padding: 6px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
}

.protocol-topics li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.protocol-cta {
    display: block;
    text-align: center;
    padding: 20px;
    color: var(--primary);
    font-weight: 600;
    border-top: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.protocol-cta:hover {
    background: rgba(99, 102, 241, 0.05);
}

/* ===================================
   Quiz Section
   =================================== */

.quiz {
    background: var(--bg-secondary);
}

.quiz-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.quiz-demo {
    position: sticky;
    top: calc(var(--nav-height) + 24px);
}

.quiz-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.quiz-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.progress-bar {
    width: 120px;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

.quiz-question {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.4;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    text-align: left;
    transition: all var(--transition-fast);
}

.quiz-option:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.quiz-option.selected {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.quiz-option.correct {
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.quiz-option.incorrect {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.option-letter {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.85rem;
}

.option-text {
    flex-grow: 1;
    font-size: 0.95rem;
}

.quiz-feedback {
    margin-top: 20px;
    padding: 16px;
    border-radius: var(--radius-md);
    display: none;
}

.quiz-feedback.show {
    display: block;
}

.quiz-feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.quiz-feedback.incorrect {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.quiz-next {
    width: 100%;
    margin-top: 20px;
    padding: 14px;
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.quiz-next:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.quiz-list h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.quiz-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quiz-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.quiz-item:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}

.quiz-item-icon {
    font-size: 1.5rem;
}

.quiz-item-info {
    flex-grow: 1;
}

.quiz-item-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.quiz-item-info p {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.quiz-item-score {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-tertiary);
}

/* ===================================
   Interview Section
   =================================== */

.interview-container {
    max-width: 900px;
    margin: 0 auto;
}

.interview-categories {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.category-btn {
    padding: 12px 24px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.category-btn:hover,
.category-btn.active {
    background: var(--primary);
    color: white;
}

.interview-questions {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.question-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.question-card:hover {
    border-color: var(--primary);
}

.question-card.open {
    box-shadow: var(--shadow-md);
}

.question-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
}

.question-number {
    padding: 6px 12px;
    background: var(--gradient-primary);
    color: white;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: var(--radius-md);
}

.question-text {
    flex-grow: 1;
    font-size: 1rem;
    font-weight: 600;
}

.question-toggle {
    font-size: 1.5rem;
    color: var(--text-tertiary);
    transition: transform var(--transition-fast);
}

.question-card.open .question-toggle {
    transform: rotate(45deg);
}

.question-answer {
    display: none;
    padding: 0 24px 24px;
    border-top: 1px solid var(--border-color);
    margin-top: 0;
    animation: slideDown 0.3s ease;
}

.question-card.open .question-answer {
    display: block;
    padding-top: 24px;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.question-answer p {
    margin-bottom: 12px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.question-answer ul {
    margin: 12px 0;
    padding-left: 20px;
}

.question-answer li {
    margin-bottom: 8px;
    color: var(--text-secondary);
    list-style: disc;
}

.code-snippet {
    margin-top: 16px;
    background: var(--code-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.code-snippet pre {
    padding: 20px;
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    line-height: 1.7;
    overflow-x: auto;
    color: var(--code-text);
}

/* ===================================
   Forum Section
   =================================== */

.forum {
    background: var(--bg-secondary);
}

.forum-container {
    max-width: 900px;
    margin: 0 auto;
}

.forum-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-bottom: 48px;
}

.forum-stat {
    text-align: center;
}

.forum-stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.forum-stat-label {
    font-size: 0.9rem;
    color: var(--text-tertiary);
}

.forum-threads {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 40px;
}

.thread-card {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.thread-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.thread-votes {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.vote-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    transition: all var(--transition-fast);
}

.vote-btn:hover {
    background: var(--primary);
    color: white;
}

.vote-count {
    font-weight: 700;
    font-size: 1.1rem;
}

.thread-content {
    flex-grow: 1;
}

.thread-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.thread-meta {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.thread-tags {
    display: flex;
    gap: 8px;
}

.forum-cta {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* ===================================
   Trends Section
   =================================== */

.trends-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.trend-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-normal);
}

.trend-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.trend-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.trend-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.trend-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.trend-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.trend-link:hover {
    color: var(--primary-dark);
}

/* ===================================
   Newsletter Section
   =================================== */

.newsletter {
    padding: 60px 0;
}

.newsletter-card {
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    padding: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.newsletter-content {
    max-width: 500px;
}

.newsletter-title {
    font-size: 2rem;
    font-weight: 800;
    color: white;
    margin-bottom: 8px;
}

.newsletter-description {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
}

.newsletter-form {
    display: flex;
    gap: 12px;
}

.newsletter-form input {
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    color: white;
    font-size: 1rem;
    min-width: 300px;
    outline: none;
    transition: all var(--transition-fast);
}

.newsletter-form input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.newsletter-form input:focus {
    background: rgba(255, 255, 255, 0.3);
    border-color: white;
}

.newsletter-form .btn-primary {
    background: white;
    color: var(--primary);
    box-shadow: none;
}

.newsletter-form .btn-primary:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: var(--bg-secondary);
    padding: 80px 0 40px;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand .nav-logo {
    margin-bottom: 16px;
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
    max-width: 300px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

.footer-legal a:hover {
    color: var(--primary);
}

/* ===================================
   Modal
   =================================== */

.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal.open {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    max-width: 800px;
    max-height: 90vh;
    width: 100%;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(20px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    z-index: 10;
}

.modal-close:hover {
    background: var(--primary);
    color: white;
}

.modal-body {
    padding: 48px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-body h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.modal-body p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.modal-body h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 32px 0 16px;
}

.modal-body ul {
    margin: 16px 0;
    padding-left: 24px;
}

.modal-body li {
    margin-bottom: 8px;
    color: var(--text-secondary);
    list-style: disc;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1200px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        max-width: 600px;
        margin: 0 auto;
    }

    .code-window {
        transform: none;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .amba-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .trends-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    :root {
        --section-padding: 80px;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        padding: 24px;
        flex-direction: column;
        gap: 8px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .blog-card.featured {
        grid-column: span 1;
        flex-direction: column;
    }

    .blog-card.featured .blog-image {
        min-width: 100%;
        min-height: 200px;
    }

    .tutorials-container {
        grid-template-columns: 1fr;
    }

    .quiz-container {
        grid-template-columns: 1fr;
    }

    .quiz-demo {
        position: static;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .newsletter-card {
        flex-direction: column;
        text-align: center;
    }

    .newsletter-form {
        flex-direction: column;
        width: 100%;
    }

    .newsletter-form input {
        min-width: 100%;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
        --nav-height: 70px;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 12px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .hero-scroll {
        display: none;
    }

    .features-grid,
    .blog-grid,
    .amba-grid,
    .trends-grid {
        grid-template-columns: 1fr;
    }

    .forum-stats {
        flex-direction: column;
        gap: 24px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .thread-card {
        flex-direction: column;
    }

    .thread-votes {
        flex-direction: row;
        justify-content: flex-start;
    }

    .interview-categories {
        gap: 8px;
    }

    .category-btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }

    .modal-body {
        padding: 24px;
    }
}

@media (max-width: 480px) {

    /* LOGO FIXES */
    .nav-logo {
        gap: 6px;
        white-space: nowrap;
        /* Never wrap text */
        max-width: 70%;
        /* Leave room for hamburger */
    }

    .logo-text {
        font-size: 1.1rem;
        /* Scale down from 1.5rem */
    }

    .logo-icon {
        font-size: 1.2rem;
    }

    .container {
        padding: 0 16px;
    }

    .nav-container {
        padding: 0 16px;
    }

    .hero-container {
        padding: 40px 16px;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .code-content {
        font-size: 0.75rem;
        padding: 16px;
    }

    .feature-card,
    .blog-content,
    .protocol-header,
    .protocol-features,
    .protocol-topics {
        padding: 20px;
    }

    .quiz-card {
        padding: 20px;
    }

    .question-header {
        padding: 16px;
    }

    .question-answer {
        padding: 0 16px 16px;
    }

    .thread-card {
        padding: 16px;
    }

    .newsletter-card {
        padding: 32px 20px;
    }
}

/* Smooth scrolling for older browsers */
@supports not (scroll-behavior: smooth) {
    html {
        scroll-behavior: auto;
    }
}

/* Print styles */
@media print {

    .navbar,
    .hero-scroll,
    .theme-toggle,
    .newsletter,
    .footer-social {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .hero {
        min-height: auto;
        padding: 40px 0;
    }
}

/* ===================================
   AdSense Placeholders
   =================================== */

.ad-placeholder-sidebar {
    width: 100%;
    height: 250px;
    /* Standard rect ad size */
    background-color: var(--bg-tertiary);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    margin-top: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    font-weight: 500;
}


.ad-placeholder-sidebar::before {
    content: 'Advertisement';
}

/* Vertical Ad Rails (Skyscrapers) */
.ad-rail-left,
.ad-rail-right {
    position: fixed;
    top: calc(var(--nav-height) + 40px);
    width: 160px;
    height: 600px;
    background-color: var(--bg-tertiary);
    border: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    z-index: 10;
    display: none;
    /* Hidden by default on small screens */
}

.ad-rail-left::before,
.ad-rail-right::before {
    content: "Ad Rail";
    transform: rotate(-90deg);
}

.ad-rail-left {
    left: 20px;
}

.ad-rail-right {
    right: 20px;
}

/* Show Rails on very wide screens */
@media (min-width: 1650px) {

    .ad-rail-left,
    .ad-rail-right {
        display: flex;
    }
}

/* Top Content Banner */
.ad-banner-top {
    width: 100%;
    height: 90px;
    /* Leaderboard size */
    background-color: var(--bg-tertiary);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.ad-banner-top::before {
    content: "Advertisement - Top Banner";
}
/* Update Note Badge */
.hero-update-note {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    font-size: 0.9rem;
    font-weight: 500;
}