/* ==================== CSS CUSTOM PROPERTIES ==================== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a28;
    --bg-card-hover: #222236;
    --bg-input: #15152a;
    --text-primary: #eaeaf0;
    --text-secondary: #9090a8;
    --text-muted: #606078;
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --accent-dark: #4834d4;
    --accent-glow: rgba(108, 92, 231, 0.3);
    --success: #00cec9;
    --success-glow: rgba(0, 206, 201, 0.2);
    --warning: #fdcb6e;
    --danger: #ff6b6b;
    --danger-glow: rgba(255, 107, 107, 0.2);
    --gradient-1: linear-gradient(135deg, #6c5ce7, #a29bfe);
    --gradient-2: linear-gradient(135deg, #0a0a0f 0%, #1a1a28 100%);
    --gradient-hero: linear-gradient(135deg, #0a0a12, #12122a 40%, #1a1040 70%, #0a0a12);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--accent-glow);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--accent);
    color: white;
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--accent-dark);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* ==================== NAVIGATION ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    transition: var(--transition);
    backdrop-filter: blur(0px);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    padding: 0.6rem 0;
    box-shadow: 0 1px 30px rgba(0, 0, 0, 0.5);
    border-bottom: 1px solid rgba(108, 92, 231, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.5px;
}

.logo-icon {
    font-size: 1.6rem;
    color: var(--accent-light);
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background: rgba(108, 92, 231, 0.15);
}

/* ==================== LANGUAGE SWITCHER ==================== */
.lang-switcher {
    position: relative;
    margin-left: auto;
    margin-right: 1rem;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.8rem;
    background: rgba(108, 92, 231, 0.12);
    border: 1px solid rgba(108, 92, 231, 0.2);
    border-radius: 50px;
    color: var(--text-primary);
    cursor: pointer;
    font-family: var(--font-main);
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}

.lang-current:hover {
    background: rgba(108, 92, 231, 0.2);
    border-color: rgba(108, 92, 231, 0.4);
}

.lang-current svg {
    transition: transform 0.2s ease;
}

.lang-switcher.open .lang-current svg {
    transform: rotate(180deg);
}

.lang-flag {
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--accent-light);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.2);
    border-radius: var(--radius-md);
    padding: 0.4rem;
    min-width: 180px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
    z-index: 1002;
}

.lang-switcher.open .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    width: 100%;
    padding: 0.6rem 0.8rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: var(--font-main);
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    text-align: left;
}

.lang-option:hover {
    background: rgba(108, 92, 231, 0.12);
    color: var(--text-primary);
}

.lang-option.active {
    background: rgba(108, 92, 231, 0.2);
    color: var(--accent-light);
    font-weight: 600;
}

.lang-code {
    font-weight: 800;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    color: var(--accent-light);
    min-width: 24px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
    border-radius: 2px;
}

/* ==================== HERO ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--gradient-hero);
    overflow: hidden;
}

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

.hero-particles {
    position: absolute;
    inset: 0;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--accent-light);
    border-radius: 50%;
    opacity: 0;
    animation: particleFloat 8s ease-in-out infinite;
}

@keyframes particleFloat {
    0% { opacity: 0; transform: translateY(100vh) scale(0); }
    20% { opacity: 0.6; }
    80% { opacity: 0.3; }
    100% { opacity: 0; transform: translateY(-100px) scale(1.5); }
}

.hero-content {
    text-align: center;
    z-index: 2;
    padding: 2rem;
    max-width: 800px;
}

.hero-subtitle {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent-light);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -2px;
    background: linear-gradient(135deg, #fff 0%, var(--accent-light) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 2.5rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--accent-light);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.hero-cta {
    display: inline-block;
    padding: 1rem 3rem;
    background: var(--gradient-1);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.5px;
    transition: var(--transition);
    box-shadow: var(--shadow-glow);
}

.hero-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 50px var(--accent-glow);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-arrow {
    width: 24px;
    height: 38px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    width: 4px;
    height: 8px;
    background: var(--accent-light);
    border-radius: 2px;
    transform: translateX(-50%);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(10px); opacity: 0.3; }
}

/* ==================== SECTIONS ==================== */
.section {
    padding: 6rem 0;
    position: relative;
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: rgba(108, 92, 231, 0.15);
    color: var(--accent-light);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 1rem;
    border: 1px solid rgba(108, 92, 231, 0.2);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 1rem;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== CALCULATOR TABS ==================== */
.calc-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.calc-tab {
    padding: 0.7rem 1.4rem;
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    color: var(--text-secondary);
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    font-family: var(--font-main);
    transition: var(--transition);
}

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

.calc-tab.active {
    background: var(--gradient-1);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

/* ==================== CALCULATOR PANELS ==================== */
.calc-panel {
    display: none;
    animation: fadeSlideUp 0.4s ease;
}

.calc-panel.active {
    display: block;
}

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.calc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: start;
}

.calc-inputs {
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.calc-inputs h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.calc-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.input-group {
    margin-bottom: 1.2rem;
}

.input-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input[type="number"],
.input-group select {
    width: 100%;
    padding: 0.8rem 1rem;
    background: var(--bg-input);
    border: 1px solid rgba(108, 92, 231, 0.15);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-mono);
    transition: var(--transition);
    outline: none;
}

.input-group input[type="number"]:focus,
.input-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-group input[type="range"] {
    width: 100%;
    margin-top: 0.5rem;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    outline: none;
}

.input-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
}

.btn-calculate {
    width: 100%;
    padding: 1rem;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-main);
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.5rem;
    letter-spacing: 0.5px;
}

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

/* ==================== RESULTS ==================== */
.calc-results {
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.calc-results h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.result-card {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.2rem;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(108, 92, 231, 0.05);
}

.result-item.highlight {
    border-color: var(--accent);
    background: rgba(108, 92, 231, 0.08);
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.result-value {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-light);
}

.result-value.small {
    font-size: 0.8rem;
    font-family: var(--font-main);
    text-align: right;
    max-width: 250px;
    color: var(--text-secondary);
}

/* DOF Visualization */
.dof-visualization {
    margin-top: 1rem;
}

.dof-bar {
    height: 40px;
    background: var(--bg-input);
    border-radius: 20px;
    position: relative;
    overflow: hidden;
}

.dof-sharp {
    position: absolute;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--success), transparent);
    opacity: 0.4;
    border-radius: 20px;
    transition: all 0.5s ease;
}

.dof-subject {
    position: absolute;
    top: 50%;
    width: 12px;
    height: 12px;
    background: var(--accent-light);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px var(--accent-glow);
    transition: left 0.5s ease;
}

.dof-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* FOV Canvas */
.fov-visualization {
    margin-top: 1rem;
    text-align: center;
}

.fov-visualization canvas {
    width: 100%;
    max-width: 400px;
    border-radius: var(--radius-sm);
}

/* Crop Comparison */
.crop-comparison {
    position: relative;
    width: 100%;
    aspect-ratio: 3/2;
    margin-top: 1rem;
    border: 2px solid var(--text-muted);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--bg-input);
}

.crop-frame {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.5s ease;
}

.crop-frame.fullframe {
    inset: 0;
    border: 2px dashed var(--text-muted);
}

.crop-frame.fullframe span {
    position: absolute;
    top: 5px;
    left: 8px;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.crop-frame.cropped {
    border: 2px solid var(--accent-light);
    background: rgba(108, 92, 231, 0.1);
}

.crop-frame.cropped span {
    font-size: 0.75rem;
    color: var(--accent-light);
    font-weight: 600;
}

/* ==================== COMPOSITION RULES ==================== */
.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 2rem;
}

.rule-card {
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.rule-card:hover {
    transform: translateY(-5px);
    border-color: rgba(108, 92, 231, 0.3);
    box-shadow: var(--shadow-lg);
}

.rule-canvas-container {
    position: relative;
    background: var(--bg-input);
    aspect-ratio: 4/3;
}

.rule-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.rule-overlay {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.rule-number {
    font-size: 0.8rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--accent-light);
    background: rgba(10, 10, 15, 0.7);
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-sm);
}

.rule-content {
    padding: 1.5rem;
}

.rule-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.rule-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.rule-tips {
    list-style: none;
    margin-bottom: 1.2rem;
}

.rule-tips li {
    padding: 0.3rem 0;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.rule-tips li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.7rem;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

.btn-demo {
    padding: 0.6rem 1.5rem;
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent-light);
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-main);
    transition: var(--transition);
}

.btn-demo:hover {
    background: var(--accent);
    color: white;
}

/* ==================== MOTIF SECTION ==================== */
.motif-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 2.5rem;
}

.motif-filter-btn {
    padding: 0.6rem 1.3rem;
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    color: var(--text-secondary);
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    font-family: var(--font-main);
    transition: var(--transition);
}

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

.motif-filter-btn.active {
    background: var(--gradient-1);
    color: white;
    border-color: transparent;
}

.motif-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

.motif-card {
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.motif-card:hover {
    transform: translateY(-4px);
    border-color: rgba(108, 92, 231, 0.3);
}

.motif-card.hidden {
    display: none;
}

.motif-icon {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    background: linear-gradient(135deg, var(--bg-input), var(--bg-card));
}

.motif-info {
    padding: 1.5rem;
}

.motif-info h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.motif-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.motif-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.motif-setting {
    padding: 0.5rem;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    text-align: center;
}

.motif-setting-label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.motif-setting-value {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--accent-light);
}

.motif-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-top: 0.8rem;
}

.motif-tag {
    padding: 0.2rem 0.6rem;
    background: rgba(108, 92, 231, 0.1);
    color: var(--accent-light);
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 500;
}

/* ==================== EXPOSURE TRIANGLE ==================== */
.exposure-interactive {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 3rem;
    align-items: center;
}

.exposure-triangle-visual {
    text-align: center;
}

.exposure-triangle-visual canvas {
    width: 100%;
    max-width: 500px;
}

.exposure-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.exposure-param {
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.param-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
}

.param-header h3 {
    font-size: 1rem;
    font-weight: 700;
}

.param-value {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-light);
    background: rgba(108, 92, 231, 0.1);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
}

.exposure-param input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    outline: none;
    margin: 0.5rem 0;
}

.exposure-param input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    background: var(--gradient-1);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 12px var(--accent-glow);
}

.param-scale {
    display: flex;
    justify-content: space-between;
    font-size: 0.65rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    margin-bottom: 0.5rem;
}

.param-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-style: italic;
}

.exposure-result {
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
}

.ev-meter {
    margin-bottom: 0.8rem;
}

.ev-bar {
    height: 12px;
    background: linear-gradient(90deg, #0984e3, #00cec9, #00b894, #fdcb6e, #e17055, #d63031);
    border-radius: 6px;
    position: relative;
    margin-bottom: 0.5rem;
}

.ev-indicator {
    position: absolute;
    top: -4px;
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    transform: translateX(-50%);
    left: 50%;
    transition: left 0.4s ease;
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
}

.ev-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.ev-text {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--success);
}

/* ==================== QUIZ ==================== */
.quiz-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.quiz-cat-btn {
    padding: 0.6rem 1.3rem;
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    color: var(--text-secondary);
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    font-family: var(--font-main);
    transition: var(--transition);
}

.quiz-cat-btn:hover {
    background: var(--bg-card-hover);
}

.quiz-cat-btn.active {
    background: var(--gradient-1);
    color: white;
    border-color: transparent;
}

.quiz-container {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-start {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-lg);
}

.quiz-start-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.quiz-start h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.quiz-start p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.quiz-info {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.btn-quiz-start, .btn-quiz-restart {
    padding: 0.9rem 2.5rem;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-main);
    cursor: pointer;
    transition: var(--transition);
}

.btn-quiz-start:hover, .btn-quiz-restart:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.quiz-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.quiz-progress-bar {
    flex: 1;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    background: var(--gradient-1);
    border-radius: 3px;
    transition: width 0.4s ease;
    width: 10%;
}

.quiz-progress-text {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.quiz-score-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.quiz-score {
    font-weight: 700;
    color: var(--accent-light);
    font-family: var(--font-mono);
}

.quiz-timer {
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.quiz-question-card {
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.quiz-category-badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: rgba(108, 92, 231, 0.15);
    color: var(--accent-light);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.quiz-question {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.quiz-option {
    padding: 1rem 1.2rem;
    background: var(--bg-input);
    border: 2px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.quiz-option:hover:not(.disabled) {
    border-color: var(--accent);
    background: rgba(108, 92, 231, 0.08);
}

.quiz-option .option-letter {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(108, 92, 231, 0.15);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--accent-light);
    flex-shrink: 0;
}

.quiz-option.correct {
    border-color: var(--success);
    background: var(--success-glow);
}

.quiz-option.correct .option-letter {
    background: var(--success);
    color: white;
}

.quiz-option.wrong {
    border-color: var(--danger);
    background: var(--danger-glow);
}

.quiz-option.wrong .option-letter {
    background: var(--danger);
    color: white;
}

.quiz-option.disabled {
    cursor: default;
    opacity: 0.6;
}

.quiz-explanation {
    padding: 1rem 1.2rem;
    background: rgba(0, 206, 201, 0.08);
    border: 1px solid rgba(0, 206, 201, 0.2);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
}

.quiz-explanation p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.btn-quiz-next {
    width: 100%;
    padding: 0.9rem;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-main);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Quiz Results */
.quiz-results {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--bg-card);
    border: 1px solid rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-lg);
}

.results-circle {
    width: 150px;
    height: 150px;
    margin: 0 auto 1.5rem;
    position: relative;
}

.results-circle svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.results-circle-bg {
    fill: none;
    stroke: var(--bg-input);
    stroke-width: 8;
}

.results-circle-fill {
    fill: none;
    stroke: var(--accent);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 339.292;
    stroke-dashoffset: 339.292;
    transition: stroke-dashoffset 1.5s ease;
}

.results-percent {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: 900;
    font-family: var(--font-mono);
    color: var(--accent-light);
}

.results-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.results-text {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.results-breakdown {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-quiz-review {
    padding: 0.9rem 2.5rem;
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent-light);
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-main);
    cursor: pointer;
    transition: var(--transition);
}

.btn-quiz-review:hover {
    background: var(--accent);
    color: white;
}

/* ==================== FOOTER ==================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid rgba(108, 92, 231, 0.1);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    font-size: 1.2rem;
    font-weight: 700;
}

.footer-brand p {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 0.8rem;
    line-height: 1.6;
}

.footer-links h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.footer-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.3rem 0;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(108, 92, 231, 0.1);
}

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

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .calc-grid {
        grid-template-columns: 1fr;
    }
    .exposure-interactive {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        transition: right 0.3s ease;
        box-shadow: var(--shadow-lg);
        border-left: 1px solid rgba(108, 92, 231, 0.1);
    }
    .nav-menu.open {
        right: 0;
    }
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    .lang-switcher {
        margin-right: 0.5rem;
    }
    .rules-grid {
        grid-template-columns: 1fr;
    }
    .motif-grid {
        grid-template-columns: 1fr;
    }
    .hero-stats {
        gap: 1.5rem;
    }
    .stat-number {
        font-size: 2rem;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .section {
        padding: 4rem 0;
    }
}

/* ==================== SIMULATION TOOLS ==================== */
.sim-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.sim-tab {
    padding: 0.6rem 1.2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.sim-tab:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.sim-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.sim-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.sim-panel.active {
    display: block;
}

.sim-grid {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 2rem;
    align-items: start;
}

.sim-controls {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.sim-controls h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.sim-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.sim-controls .input-group {
    margin-bottom: 1.2rem;
}

.sim-controls .input-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.sim-controls .input-group input[type="range"] {
    width: 100%;
}

.sim-controls .range-value {
    display: inline-block;
    margin-top: 0.3rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 500;
}

.sim-controls .input-group select {
    width: 100%;
    padding: 0.5rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.sim-canvas-wrap {
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.sim-canvas-wrap canvas {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

@media (max-width: 768px) {
    .sim-grid {
        grid-template-columns: 1fr;
    }
    .sim-tabs {
        gap: 0.3rem;
    }
    .sim-tab {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .calc-tabs {
        gap: 0.3rem;
    }
    .calc-tab {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }
    .param-scale {
        display: none;
    }
    .sim-tab {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
    }
}