/* ===========================================
   CAD MASTER - WORLD-CLASS DESIGN SYSTEM
   Inspired by Stripe, Linear, Vercel, Notion
   =========================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
    /* Premium Color Palette */
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --bg-elevated: #1f1f23;
    --bg-hover: #27272a;

    /* Accent Colors - Electric Gradient */
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #a855f7;
    --accent-glow: rgba(99, 102, 241, 0.5);

    /* Highlight Colors */
    --highlight-cyan: #22d3ee;
    --highlight-emerald: #10b981;
    --highlight-amber: #f59e0b;
    --highlight-rose: #f43f5e;

    /* Text Colors */
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --text-muted: #52525b;

    /* Border & Divider */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.15);

    /* Effects */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glow-sm: 0 0 20px var(--accent-glow);
    --glow-md: 0 0 40px var(--accent-glow);
    --glow-lg: 0 0 80px var(--accent-glow);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.6);

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

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-2xl: 28px;
    --radius-full: 9999px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

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

/* ===== ANIMATED BACKGROUND ===== */
.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
}

.animated-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(168, 85, 247, 0.05) 0%, transparent 50%);
    animation: bgFloat 20s ease-in-out infinite;
}

@keyframes bgFloat {

    0%,
    100% {
        transform: translate(0, 0) rotate(0deg);
    }

    25% {
        transform: translate(2%, -2%) rotate(1deg);
    }

    50% {
        transform: translate(-1%, 2%) rotate(-1deg);
    }

    75% {
        transform: translate(-2%, -1%) rotate(0.5deg);
    }
}

/* Grid Pattern Overlay */
.grid-pattern {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* ===== HEADER - FLOATING GLASS ===== */
.header-world-class {
    position: fixed;
    top: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - var(--space-8));
    max-width: 1400px;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-3) var(--space-6);
    transition: all var(--duration-normal) var(--ease-out);
}

.header-world-class.scrolled {
    background: rgba(10, 10, 11, 0.9);
    border-color: var(--border-default);
    box-shadow: var(--shadow-lg);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
}

.logo-world-class {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon-wc {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: white;
    box-shadow: var(--glow-sm);
}

.logo-text-wc {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-world-class {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav-link-wc {
    padding: var(--space-2) var(--space-4);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--ease-out);
}

.nav-link-wc:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.nav-link-wc.active {
    color: var(--text-primary);
}

.nav-cta-wc {
    margin-left: var(--space-4);
    padding: var(--space-2) var(--space-5);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--duration-fast) var(--ease-out);
    box-shadow: var(--glow-sm);
}

.nav-cta-wc:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-md);
}

/* ===== HERO - CINEMATIC ===== */
.hero-cinematic {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-24) var(--space-8);
    position: relative;
}

.hero-content-wc {
    max-width: 1200px;
    text-align: center;
    position: relative;
    z-index: 1;
}

/* Floating Badge */
.hero-badge-wc {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--glass-bg);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    animation: fadeInDown 0.8s var(--ease-out) forwards;
}

.hero-badge-wc .badge-dot {
    width: 8px;
    height: 8px;
    background: var(--highlight-emerald);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

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

    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

/* Hero Title - Gradient Text */
.hero-title-wc {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.8s var(--ease-out) 0.1s forwards;
    opacity: 0;
}

.hero-title-wc .gradient-text {
    background: linear-gradient(135deg,
            var(--highlight-cyan) 0%,
            var(--accent-primary) 25%,
            var(--accent-secondary) 50%,
            var(--accent-tertiary) 75%,
            var(--highlight-rose) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientShift 5s linear infinite;
}

@keyframes gradientShift {
    0% {
        background-position: 0% center;
    }

    100% {
        background-position: 200% center;
    }
}

.hero-subtitle-wc {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-10);
    line-height: 1.7;
    animation: fadeInUp 0.8s var(--ease-out) 0.2s forwards;
    opacity: 0;
}

/* Bento Grid Stats */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    max-width: 900px;
    margin: 0 auto var(--space-10);
    animation: fadeInUp 0.8s var(--ease-out) 0.3s forwards;
    opacity: 0;
}

.bento-card {
    background: var(--glass-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    text-align: center;
    transition: all var(--duration-normal) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.bento-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.02) 100%);
    opacity: 0;
    transition: opacity var(--duration-normal);
}

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

.bento-card:hover::before {
    opacity: 1;
}

.bento-value {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-1);
}

.bento-label {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
}

/* Hero CTA Buttons */
.hero-cta-group-wc {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    animation: fadeInUp 0.8s var(--ease-out) 0.4s forwards;
    opacity: 0;
}

.btn-primary-wc {
    padding: var(--space-4) var(--space-8);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--duration-fast) var(--ease-out);
    box-shadow: var(--glow-sm);
}

.btn-primary-wc:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--glow-md);
}

.btn-secondary-wc {
    padding: var(--space-4) var(--space-8);
    background: var(--glass-bg);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--duration-fast) var(--ease-out);
}

.btn-secondary-wc:hover {
    background: var(--bg-hover);
    border-color: var(--border-strong);
    transform: translateY(-2px);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

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

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

/* ===== SEARCH SECTION ===== */
.search-section-wc {
    padding: var(--space-8) var(--space-8);
    display: flex;
    justify-content: center;
    margin-top: -80px;
    position: relative;
    z-index: 10;
}

.search-box-wc {
    width: 100%;
    max-width: 700px;
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-2);
    transition: all var(--duration-normal) var(--ease-out);
}

.search-box-wc:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

.search-input-wc {
    flex: 1;
    background: transparent;
    border: none;
    padding: var(--space-4) var(--space-5);
    font-size: 1rem;
    color: var(--text-primary);
    outline: none;
}

.search-input-wc::placeholder {
    color: var(--text-tertiary);
}

.search-icon-wc {
    padding: 0 var(--space-4);
    color: var(--text-tertiary);
    font-size: 1.25rem;
}

.search-btn-wc {
    padding: var(--space-3) var(--space-6);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    font-weight: 600;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--duration-fast);
}

.search-btn-wc:hover {
    transform: scale(1.02);
}

/* ===== CONTENT HUB - THREE COLUMN LAYOUT ===== */
.content-hub-wc {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--space-12) var(--space-8);
}

.hub-header-wc {
    text-align: center;
    margin-bottom: var(--space-12);
}

.hub-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--glass-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-4);
}

.hub-title-wc {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

.hub-subtitle-wc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* Filter Tabs */
.filter-tabs-wc {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-8);
    padding: var(--space-2);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.filter-tab {
    padding: var(--space-3) var(--space-6);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--duration-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.filter-tab:hover {
    color: var(--text-primary);
}

.filter-tab.active {
    background: var(--accent-primary);
    color: white;
    box-shadow: var(--glow-sm);
}

.filter-tab .count {
    font-size: 0.75rem;
    padding: 2px 8px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
}

/* Content Grid - Masonry Style */
.content-grid-wc {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: var(--space-5);
}

/* Premium Card */
.card-wc {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--duration-normal) var(--ease-out);
    position: relative;
}

.card-wc::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary));
    opacity: 0;
    transition: opacity var(--duration-fast);
}

.card-wc:hover {
    border-color: var(--border-strong);
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.card-wc:hover::before {
    opacity: 1;
}

.card-header-wc {
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    color: white;
    font-size: 2.5rem;
}

.card-header-wc.tutorial {
    background: linear-gradient(135deg, #6366f1, #818cf8);
}

.card-header-wc.tip {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
}

.card-header-wc.feature {
    background: linear-gradient(135deg, #10b981, #34d399);
}

.card-type-badge-wc {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    padding: var(--space-1) var(--space-3);
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-body-wc {
    padding: var(--space-5);
}

.card-tags-wc {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.tag-wc {
    padding: var(--space-1) var(--space-2);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.tag-wc.difficulty {
    color: white;
}

.tag-wc.beginner {
    background: var(--highlight-emerald);
}

.tag-wc.intermediate {
    background: var(--highlight-amber);
}

.tag-wc.advanced {
    background: var(--highlight-rose);
}

.card-title-wc {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    letter-spacing: -0.01em;
}

.card-desc-wc {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    line-height: 1.5;
    margin-bottom: var(--space-4);
}

/* Hashtags */
.card-hashtags-wc {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.hashtag-wc {
    font-size: 0.75rem;
    color: var(--accent-primary);
    font-weight: 500;
}

.card-footer-wc {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-subtle);
}

.card-link-wc {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.875rem;
    transition: gap var(--duration-fast);
}

.card-link-wc:hover {
    gap: var(--space-3);
}

/* Load More */
.load-more-wc {
    text-align: center;
    margin-top: var(--space-12);
}

.btn-load-more-wc {
    padding: var(--space-4) var(--space-10);
    background: var(--glass-bg);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    font-weight: 600;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    transition: all var(--duration-fast);
}

.btn-load-more-wc:hover {
    background: var(--bg-hover);
    border-color: var(--border-strong);
    transform: scale(1.02);
}

/* ===== FOOTER ===== */
.footer-wc {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-20) var(--space-8) var(--space-8);
}

.footer-grid-wc {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-16);
    margin-bottom: var(--space-12);
}

.footer-brand-wc p {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    margin-top: var(--space-4);
    max-width: 300px;
    line-height: 1.7;
}

.footer-title-wc {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-4);
}

.footer-links-wc {
    list-style: none;
}

.footer-links-wc li {
    margin-bottom: var(--space-3);
}

.footer-links-wc a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--duration-fast);
}

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

.footer-bottom-wc {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copy-wc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid-wc {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .header-world-class {
        top: var(--space-2);
        width: calc(100% - var(--space-4));
    }

    .nav-world-class {
        display: none;
    }

    .hero-cinematic {
        padding: var(--space-20) var(--space-4);
    }

    .hero-title-wc {
        font-size: 2.5rem;
    }

    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }

    .bento-card {
        padding: var(--space-4);
    }

    .bento-value {
        font-size: 1.75rem;
    }

    .hero-cta-group-wc {
        flex-direction: column;
        gap: var(--space-3);
    }

    .filter-tabs-wc {
        flex-wrap: wrap;
        width: 100%;
    }

    .content-grid-wc {
        grid-template-columns: 1fr;
    }

    .footer-grid-wc {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .footer-bottom-wc {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}

/* ===== MICRO INTERACTIONS ===== */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

.shimmer {
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}