/* ===================================
   QuantumLab Pro - Premium Styles
   =================================== */

/* CSS Variables */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: rgba(26, 26, 37, 0.8);
    --bg-glass: rgba(26, 26, 37, 0.6);

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;

    --accent-cyan: #00f5ff;
    --accent-purple: #bf00ff;
    --accent-blue: #3b82f6;
    --accent-pink: #ec4899;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;

    --gradient-primary: linear-gradient(135deg, #00f5ff 0%, #bf00ff 100%);
    --gradient-secondary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(0, 245, 255, 0.15) 0%, transparent 70%);

    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(0, 245, 255, 0.3);

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

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(0, 245, 255, 0.15);
    --shadow-glow-purple: 0 0 40px rgba(191, 0, 255, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

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

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* Particle Canvas */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.5;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-base);
}

.navbar.scrolled {
    padding: var(--spacing-sm) 0;
    background: rgba(10, 10, 15, 0.95);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--spacing-sm) 0;
    position: relative;
    transition: var(--transition-base);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Buttons */
.btn-ghost {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: var(--transition-base);
}

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

.btn-ghost svg {
    width: 20px;
    height: 20px;
}

.btn-ghost .icon-moon {
    display: none;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--bg-primary);
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition-base);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-primary svg {
    width: 18px;
    height: 18px;
}

.btn-primary.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.btn-outline:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 245, 255, 0.1);
    box-shadow: var(--shadow-glow);
}

.btn-outline svg {
    width: 18px;
    height: 18px;
}

.btn-outline.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem var(--spacing-xl) var(--spacing-3xl);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-glow);
    pointer-events: none;
}

.hero-content {
    flex: 1;
    max-width: 700px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

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

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

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-lg);
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
}

.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2xl);
}

.stat {
    display: flex;
    flex-direction: column;
}

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

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Hero Visual - Quantum Sphere */
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.quantum-sphere {
    width: 400px;
    height: 400px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

.sphere-ring {
    position: absolute;
    border: 2px solid transparent;
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.ring-1 {
    width: 300px;
    height: 300px;
    border-color: rgba(0, 245, 255, 0.4);
    animation-duration: 15s;
}

.ring-2 {
    width: 350px;
    height: 200px;
    border-color: rgba(191, 0, 255, 0.3);
    transform: rotateX(60deg);
    animation-duration: 20s;
    animation-direction: reverse;
}

.ring-3 {
    width: 350px;
    height: 200px;
    border-color: rgba(59, 130, 246, 0.3);
    transform: rotateX(60deg) rotateY(60deg);
    animation-duration: 25s;
}

@keyframes rotate {
    from {
        transform: rotateZ(0deg);
    }

    to {
        transform: rotateZ(360deg);
    }
}

.sphere-core {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow:
        0 0 60px rgba(0, 245, 255, 0.5),
        0 0 120px rgba(191, 0, 255, 0.3),
        inset 0 0 30px rgba(255, 255, 255, 0.2);
    animation: glow 3s ease-in-out infinite;
}

@keyframes glow {

    0%,
    100% {
        box-shadow: 0 0 60px rgba(0, 245, 255, 0.5), 0 0 120px rgba(191, 0, 255, 0.3);
    }

    50% {
        box-shadow: 0 0 80px rgba(0, 245, 255, 0.7), 0 0 160px rgba(191, 0, 255, 0.5);
    }
}

.qubit-particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.qubit {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--accent-cyan);
    animation: orbit 10s linear infinite;
}

.q1 {
    animation-duration: 8s;
    animation-delay: 0s;
}

.q2 {
    animation-duration: 10s;
    animation-delay: -2s;
}

.q3 {
    animation-duration: 12s;
    animation-delay: -4s;
}

.q4 {
    animation-duration: 9s;
    animation-delay: -6s;
    animation-direction: reverse;
}

.q5 {
    animation-duration: 11s;
    animation-delay: -8s;
}

.q6 {
    animation-duration: 7s;
    animation-delay: -3s;
    animation-direction: reverse;
}

@keyframes orbit {
    0% {
        transform: rotate(0deg) translateX(150px) rotate(0deg);
    }

    100% {
        transform: rotate(360deg) translateX(150px) rotate(-360deg);
    }
}

/* ===================================
   Section Styles
   =================================== */
section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-cyan);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Features Section
   =================================== */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.feature-card:hover::before {
    opacity: 0.05;
}

.feature-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.1) 0%, rgba(191, 0, 255, 0.1) 100%);
    border-color: var(--border-glow);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-icon.blue {
    color: var(--accent-blue);
}

.feature-icon.purple {
    color: var(--accent-purple);
}

.feature-icon.cyan {
    color: var(--accent-cyan);
}

.feature-icon.green {
    color: var(--accent-green);
}

.feature-icon.orange {
    color: var(--accent-orange);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    position: relative;
    z-index: 1;
}

.feature-link {
    display: inline-flex;
    align-items: center;
    margin-top: var(--spacing-md);
    color: var(--accent-cyan);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition-base);
    position: relative;
    z-index: 1;
}

.feature-link:hover {
    gap: var(--spacing-sm);
}

/* ===================================
   Scope & Limitations Section
   =================================== */
.scope-section {
    background: var(--bg-primary);
}

.scope-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.scope-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
}

.scope-card:hover {
    border-color: var(--border-glow);
}

.scope-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    color: var(--accent-cyan);
}

.scope-icon.warning {
    color: var(--accent-orange);
}

.scope-icon svg {
    width: 24px;
    height: 24px;
}

.scope-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.scope-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.scope-card strong {
    color: var(--accent-cyan);
    font-weight: 600;
}

.scope-card ul {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.8;
    padding-left: var(--spacing-lg);
    list-style: disc;
}

.scope-card ul li {
    margin-bottom: var(--spacing-xs);
}

/* ===================================
   Simulator Section
   =================================== */
.simulator-section {
    background: var(--bg-primary);
    overflow: visible;
}

.simulator-wrapper {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.simulator-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 var(--spacing-sm);
}

.tool-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: var(--transition-base);
}

.tool-btn svg {
    width: 18px;
    height: 18px;
}

.tool-btn:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.tool-btn.active {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}

.tool-btn.danger:hover {
    background: rgba(239, 68, 68, 0.2);
    color: var(--accent-red);
}

.tool-btn.success {
    background: var(--accent-green);
    color: var(--bg-primary);
}

.tool-btn.success:hover {
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.4);
}

.simulator-main {
    display: grid;
    grid-template-columns: 250px 1fr 300px;
    min-height: 500px;
}

/* Gates Panel */
.gates-panel {
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: 600px;
}

.gates-category {
    margin-bottom: var(--spacing-xl);
}

.gates-category h4 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.gates-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.gate-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: grab;
    transition: var(--transition-base);
}

.gate-item:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 245, 255, 0.1);
    transform: translateY(-2px);
}

.gate-item:active {
    cursor: grabbing;
}

.gate-symbol {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.gate-name {
    font-size: 0.625rem;
    color: var(--text-muted);
    margin-top: 2px;
    text-align: center;
}

.gate-item.multi .gate-symbol {
    color: var(--accent-purple);
}

.gate-item.measure .gate-symbol {
    font-size: 1.25rem;
}

/* Circuit Canvas */
.circuit-canvas-container {
    padding: var(--spacing-lg);
    overflow-x: auto;
    background:
        radial-gradient(circle at 1px 1px, var(--border-color) 1px, transparent 0);
    background-size: 20px 20px;
}

.circuit-canvas {
    min-width: 600px;
    min-height: 200px;
}

.qubit-row {
    display: flex;
    align-items: center;
    height: 60px;
    margin-bottom: var(--spacing-md);
}

.qubit-label {
    width: 50px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.qubit-wire {
    flex: 1;
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

.wire-line {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--text-muted);
    transform: translateY(-50%);
}

.gate-slots {
    display: flex;
    gap: var(--spacing-md);
    position: relative;
    z-index: 1;
    padding: 0 var(--spacing-md);
}

.placed-gate {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 2px solid var(--accent-cyan);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--accent-cyan);
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
}

.placed-gate:hover {
    transform: scale(1.1);
    box-shadow: 0 0 25px rgba(0, 245, 255, 0.5);
}

.qubit-output {
    width: 50px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-cyan);
    text-align: right;
}

/* Results Panel */
.results-panel {
    background: var(--bg-card);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.results-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-md);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    transition: var(--transition-base);
}

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

.tab-btn.active {
    color: var(--accent-cyan);
    background: var(--bg-tertiary);
    border-bottom: 2px solid var(--accent-cyan);
}

.results-content {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.statevector-display {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.state-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    position: relative;
    overflow: hidden;
}

.state-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, rgba(0, 245, 255, 0.2) 0%, rgba(191, 0, 255, 0.2) 100%);
    border-radius: var(--radius-md);
    transition: width 0.5s ease;
}

.state-basis {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--accent-cyan);
    width: 50px;
    position: relative;
    z-index: 1;
}

.state-amplitude {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

.probability-chart,
.bloch-container {
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#prob-canvas,
#bloch-canvas {
    max-width: 100%;
    max-height: 100%;
}

/* ===================================
   Algorithms Section
   =================================== */
.algorithms-section {
    background: var(--bg-secondary);
}

.algorithms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.algorithm-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition-base);
}

.algorithm-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.algo-visual {
    height: 160px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
}

.algo-animation {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Grover Animation */
.search-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.search-item {
    width: 24px;
    height: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    animation: searchPulse 2s infinite;
}

.search-item.target {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px var(--accent-cyan);
    animation: targetGlow 1s infinite;
}

@keyframes searchPulse {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

@keyframes targetGlow {

    0%,
    100% {
        box-shadow: 0 0 20px var(--accent-cyan);
    }

    50% {
        box-shadow: 0 0 40px var(--accent-cyan);
    }
}

/* Shor Animation */
.factor-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
}

.factor-display .number {
    color: var(--text-primary);
}

.factor-display .equals,
.factor-display .times {
    color: var(--text-muted);
}

.factor-display .factor {
    color: var(--accent-purple);
    animation: factorPop 2s infinite;
}

@keyframes factorPop {

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

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

/* QFT Animation */
.wave-container {
    width: 120px;
    height: 60px;
}

.wave-container svg {
    width: 100%;
    height: 100%;
}

.wave {
    fill: none;
    stroke-width: 2;
    animation: waveMove 2s ease-in-out infinite;
}

.wave1 {
    stroke: var(--accent-cyan);
}

.wave2 {
    stroke: var(--accent-purple);
    animation-delay: 0.5s;
}

@keyframes waveMove {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(5px);
    }
}

/* VQE Animation */
.molecule {
    display: flex;
    align-items: center;
}

.atom {
    width: 30px;
    height: 30px;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.5);
    animation: atomPulse 2s infinite;
}

.bond {
    width: 30px;
    height: 4px;
    background: var(--text-muted);
    animation: bondStretch 2s infinite;
}

@keyframes atomPulse {

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

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

@keyframes bondStretch {

    0%,
    100% {
        width: 30px;
    }

    50% {
        width: 40px;
    }
}

/* QAOA Animation */
.graph-nodes {
    position: relative;
    width: 100px;
    height: 100px;
}

.graph-nodes .node {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--accent-green);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-green);
}

.node.n1 {
    top: 10%;
    left: 10%;
}

.node.n2 {
    top: 10%;
    right: 10%;
}

.node.n3 {
    bottom: 10%;
    right: 10%;
}

.node.n4 {
    bottom: 10%;
    left: 10%;
}

.graph-nodes .edges {
    position: absolute;
    width: 100%;
    height: 100%;
}

.graph-nodes .edges line {
    stroke: var(--text-muted);
    stroke-width: 1;
}

/* BB84 Animation */
.key-stream {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.5rem;
}

.photon-stream {
    display: flex;
    gap: var(--spacing-sm);
}

.photon {
    width: 8px;
    height: 8px;
    background: var(--accent-orange);
    border-radius: 50%;
    animation: photonMove 1s infinite;
}

.photon:nth-child(2) {
    animation-delay: 0.3s;
}

.photon:nth-child(3) {
    animation-delay: 0.6s;
}

@keyframes photonMove {
    0% {
        transform: translateX(-20px);
        opacity: 0;
    }

    50% {
        opacity: 1;
    }

    100% {
        transform: translateX(20px);
        opacity: 0;
    }
}

.algo-content {
    padding: var(--spacing-lg);
}

.algo-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.algo-content p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-md);
}

.algo-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.algo-meta .tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.algo-meta .complexity {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(191, 0, 255, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--accent-purple);
}

/* ===================================
   Visualizer Section
   =================================== */
.visualizer-section {
    background: var(--bg-primary);
}

.visualizer-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: var(--spacing-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-2xl);
    overflow: hidden;
}

.viz-controls {
    padding: var(--spacing-xl);
    border-right: 1px solid var(--border-color);
}

.control-group {
    margin-bottom: var(--spacing-xl);
}

.control-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.state-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.state-btn {
    padding: var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.state-btn:hover {
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

.state-btn.active {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: var(--bg-primary);
}

.slider {
    width: 100%;
    height: 8px;
    appearance: none;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    outline: none;
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-glow);
}

.gate-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.gate-btn {
    width: 40px;
    height: 40px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-cyan);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.gate-btn:hover {
    background: rgba(0, 245, 255, 0.2);
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
}

.state-info {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.state-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.state-equation {
    font-family: var(--font-mono);
    font-size: 1rem;
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.state-equation span {
    color: var(--accent-cyan);
}

.probability-display {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.prob-bar {
    position: relative;
    padding: var(--spacing-sm);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.prob-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    transition: width 0.5s ease;
}

.prob-fill.prob-0 {
    background: linear-gradient(90deg, rgba(0, 245, 255, 0.3) 0%, rgba(0, 245, 255, 0.1) 100%);
}

.prob-fill.prob-1 {
    background: linear-gradient(90deg, rgba(191, 0, 255, 0.3) 0%, rgba(191, 0, 255, 0.1) 100%);
}

.prob-bar span {
    position: relative;
    z-index: 1;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.viz-canvas {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
    padding: var(--spacing-xl);
}

#bloch-main-canvas {
    max-width: 100%;
    max-height: 100%;
}

.viz-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.axis-label {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.axis-label.top {
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
}

.axis-label.bottom {
    bottom: 10%;
    left: 50%;
    transform: translateX(-50%);
}

.axis-label.right {
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
}

.axis-label.left {
    left: 10%;
    top: 50%;
    transform: translateY(-50%);
}

/* ===================================
   Learn Section
   =================================== */
.learn-section {
    background: var(--bg-secondary);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.course-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.course-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.course-number {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: 3rem;
    font-weight: 800;
    color: var(--bg-tertiary);
    line-height: 1;
}

.course-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    color: var(--accent-cyan);
}

.course-icon svg {
    width: 28px;
    height: 28px;
}

.course-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.course-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-md);
}

.course-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.course-progress {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

/* ===================================
   Export Section
   =================================== */
.export-section {
    background: var(--bg-primary);
    padding: var(--spacing-3xl) 0;
}

.export-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.1) 0%, rgba(191, 0, 255, 0.1) 100%);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
}

.export-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.export-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.export-frameworks {
    display: flex;
    gap: var(--spacing-lg);
}

.framework {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.framework img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
}

.framework span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.export-code {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.code-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.code-tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-base);
}

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

.code-tab.active {
    color: var(--accent-cyan);
    background: var(--bg-card);
}

.code-block {
    padding: var(--spacing-lg);
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.7;
    color: var(--text-secondary);
    overflow-x: auto;
}

.copy-btn {
    margin: var(--spacing-md);
    margin-top: 0;
}

.copy-btn svg {
    width: 16px;
    height: 16px;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    max-width: 300px;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: var(--transition-base);
}

.social-links a:hover {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

.footer-links h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: var(--transition-base);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-legal {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-legal a {
    color: var(--text-muted);
    font-size: 0.875rem;
    transition: var(--transition-base);
}

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

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1200px) {
    .simulator-main {
        grid-template-columns: 200px 1fr 250px;
    }

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

@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        padding-top: 6rem;
    }

    .hero-visual {
        order: -1;
        margin-bottom: var(--spacing-2xl);
    }

    .quantum-sphere {
        width: 300px;
        height: 300px;
    }

    .simulator-main {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
    }

    .gates-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        max-height: 200px;
    }

    .gates-grid {
        grid-template-columns: repeat(6, 1fr);
    }

    .results-panel {
        border-left: none;
        border-top: 1px solid var(--border-color);
    }

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

    .viz-controls {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .export-card {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-stats {
        gap: var(--spacing-lg);
    }

    .stat-value {
        font-size: 2rem;
    }

    .feature-card.featured {
        grid-column: span 1;
    }

    .features-grid,
    .algorithms-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }

    .gates-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn-lg {
        width: 100%;
        justify-content: center;
    }

    .hero-stats {
        flex-direction: column;
        align-items: flex-start;
    }

    .gates-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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