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

/* === Custom Properties === */
:root {
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 48px;
    --space-2xl: 80px;
    --space-3xl: 120px;

    /* Layout */
    --container-max: 1120px;
    --nav-height: 64px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    /* Colors — Light theme (default) */
    --bg-page: #FAFAFA;
    --bg-card: #FFFFFF;
    --bg-card-hover: #F7F7F8;
    --bg-nav: rgba(255, 255, 255, 0.85);
    --bg-code: #F2F2F7;

    --text-primary: #000000;
    --text-secondary: #808080;
    --text-muted: #B0B0B0;

    --border: #F0F0F0;
    --border-hover: #E0E0E0;

    --btn-primary-bg: #000000;
    --btn-primary-text: #FFFFFF;
    --btn-primary-hover: #1C1C1E;
    --btn-secondary-bg: transparent;
    --btn-secondary-text: #000000;
    --btn-secondary-border: #E0E0E0;
    --btn-secondary-hover-bg: #F7F7F8;

    --accent: #007AFF;

    --pricing-pro-border: #000000;
    --pricing-pro-bg: #FAFAFA;

    --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.03);
    --shadow-nav: 0 1px 0 rgba(0,0,0,0.06);
}

/* === Dark Theme === */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-page: #1C1C1E;
        --bg-card: #2C2C2E;
        --bg-card-hover: #3A3A3C;
        --bg-nav: rgba(28, 28, 30, 0.85);
        --bg-code: #3A3A3C;

        --text-primary: #FFFFFF;
        --text-secondary: #98989D;
        --text-muted: #636366;

        --border: #3A3A3C;
        --border-hover: #48484A;

        --btn-primary-bg: #FFFFFF;
        --btn-primary-text: #000000;
        --btn-primary-hover: #E5E5EA;
        --btn-secondary-text: #FFFFFF;
        --btn-secondary-border: #48484A;
        --btn-secondary-hover-bg: #3A3A3C;

        --pricing-pro-border: #FFFFFF;
        --pricing-pro-bg: #2C2C2E;

        --shadow-card: 0 1px 3px rgba(0,0,0,0.2), 0 4px 12px rgba(0,0,0,0.15);
        --shadow-nav: 0 1px 0 rgba(255,255,255,0.06);
    }
}

/* === Base === */
html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-page);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
}

/* === Container === */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* === Nav === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: var(--bg-nav);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-nav);
    z-index: 100;
    transition: box-shadow 0.2s;
}

.nav-scrolled {
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.15s;
}

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

.lang-toggle {
    font-size: 13px;
    font-weight: 600;
    padding: 6px 14px;
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--text-primary);
    transition: all 0.15s;
}

.lang-toggle:hover {
    background: var(--bg-card-hover);
}

/* === Buttons === */
.btn-primary {
    display: inline-block;
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border: none;
    border-radius: var(--radius-full);
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
    text-align: center;
}

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

.btn-secondary {
    display: inline-block;
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border: 1px solid var(--btn-secondary-border);
    border-radius: var(--radius-full);
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
}

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

/* === Hero === */
.hero {
    padding-top: calc(var(--nav-height) + var(--space-3xl));
    padding-bottom: var(--space-2xl);
    text-align: center;
}

.hero-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    max-width: 700px;
}

.hero-subtitle {
    margin-top: var(--space-lg);
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.5;
    max-width: 560px;
}

.hero-cta {
    margin-top: var(--space-xl);
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

/* === Hero Demo Animation === */
.hero-demo {
    margin-top: var(--space-2xl);
    max-width: 700px;
    width: 100%;
}

.demo-screen {
    position: relative;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3), 0 2px 8px rgba(0,0,0,0.2);
}

/* --- HUD overlay (matches real Velllab overlay) --- */
.demo-hud {
    position: absolute;
    top: 58px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    background: rgba(20, 20, 20, 0.92);
    border-radius: 20px;
    z-index: 2;
    opacity: 0;
    transition: opacity 0.3s ease;
    max-width: calc(100% - 32px);
}

.demo-hud.visible {
    opacity: 1;
}

.demo-hud-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #FF3B30;
    flex-shrink: 0;
}

.demo-hud-dot.recording {
    animation: pulse-rec 1s ease-in-out infinite;
}

.demo-hud-dot.done {
    background: #34C759;
    animation: none;
}

@keyframes pulse-rec {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(255, 59, 48, 0.4); }
    50% { opacity: 0.6; box-shadow: 0 0 0 6px rgba(255, 59, 48, 0); }
}

/* Audio bars */
.demo-hud-bars {
    display: flex;
    align-items: flex-end;
    gap: 2px;
    height: 18px;
    flex-shrink: 0;
}

.demo-bar {
    width: 3px;
    background: #FF3B30;
    border-radius: 1px;
    min-height: 3px;
    transition: height 0.1s ease;
}

.demo-hud-bars.done .demo-bar {
    background: #34C759;
}

/* Timer */
.demo-hud-timer {
    font-family: 'Segoe UI', var(--font-main);
    font-size: 12px;
    font-weight: 500;
    color: #98989D;
    flex-shrink: 0;
}

.demo-hud-text {
    font-family: 'Segoe UI', var(--font-main);
    font-size: 14px;
    font-weight: 500;
    color: #FFFFFF;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* --- Mock app window --- */
.demo-app {
    background: #1C1C1E;
}

.demo-app-bar {
    display: flex;
    align-items: center;
    padding: 14px 18px;
    background: #2C2C2E;
    border-bottom: 1px solid #3A3A3C;
}

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

.demo-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #48484A;
}

.demo-app-body {
    padding: 56px 28px 40px;
    font-size: 18px;
    color: #F5F5F7;
    line-height: 1.7;
    min-height: 180px;
}

.demo-cursor {
    color: #007AFF;
    font-weight: 300;
    animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@media (max-width: 767px) {
    .demo-app-body {
        padding: 48px 20px 32px;
        font-size: 16px;
        min-height: 140px;
    }

    .demo-hud {
        top: 50px;
        padding: 10px 18px;
    }

    .demo-hud-text {
        font-size: 13px;
    }
}

/* === Sections (shared) === */
.features,
.steps,
.pricing,
.faq {
    padding: var(--space-2xl) 0;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    text-align: center;
    max-width: 560px;
    margin: calc(-1 * var(--space-lg)) auto var(--space-xl);
}

/* === Features Grid === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-card);
    transition: border-color 0.15s;
}

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

.feature-icon {
    font-size: 28px;
    margin-bottom: var(--space-sm);
}

.feature-title {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.feature-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* === Steps === */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    text-align: center;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.step-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.step-desc {
    font-size: 15px;
    color: var(--text-secondary);
}

kbd {
    display: inline-block;
    padding: 3px 8px;
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-hover);
    border-radius: 6px;
    box-shadow: 0 1px 0 var(--border-hover);
}

/* === Pricing === */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    max-width: 800px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl) var(--space-lg);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
}

.pricing-card.pro {
    border-color: var(--pricing-pro-border);
    border-width: 2px;
}

.pricing-plan {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.pricing-price {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: var(--space-sm) 0;
}

.pricing-price-note {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.pricing-features {
    list-style: none;
    flex: 1;
    margin-bottom: var(--space-lg);
}

.pricing-features li {
    padding: var(--space-sm) 0;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.pricing-features li::before {
    content: "";
    display: inline-block;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.pricing-features li.included::before {
    content: "\2713";
    color: #34C759;
    font-weight: 700;
    font-size: 15px;
}

.pricing-features li.excluded::before {
    content: "\2717";
    color: var(--text-muted);
    font-weight: 700;
    font-size: 15px;
}

.pricing-features li.excluded {
    color: var(--text-muted);
}

.pricing-card .btn-primary,
.pricing-card .btn-secondary {
    width: 100%;
}

/* === FAQ === */
.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border);
}

.faq-item summary {
    cursor: pointer;
    padding: var(--space-md) 0;
    font-size: 17px;
    font-weight: 500;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    font-size: 22px;
    font-weight: 300;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: transform 0.2s;
}

.faq-item[open] summary::after {
    content: "\2212";
}

.faq-answer {
    padding-bottom: var(--space-md);
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

/* === Footer === */
.footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.footer-brand {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    color: var(--text-secondary);
    transition: color 0.15s;
}

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

.footer-copy {
    color: var(--text-muted);
}

/* === Responsive === */
@media (max-width: 767px) {
    .hero {
        padding-top: calc(var(--nav-height) + var(--space-xl));
        padding-bottom: var(--space-xl);
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 17px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta .btn-primary,
    .hero-cta .btn-secondary {
        width: 100%;
        max-width: 320px;
    }

    .section-title {
        font-size: 28px;
    }

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

    .steps-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

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

    .pricing-price {
        font-size: 40px;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* === Thank You Page === */
.thankyou {
    padding-top: calc(var(--nav-height) + var(--space-3xl));
    padding-bottom: var(--space-2xl);
    text-align: center;
}

.thankyou-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.thankyou-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: #34C759;
    color: #fff;
    font-size: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.thankyou-title {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.thankyou-text {
    margin-top: var(--space-md);
    font-size: 18px;
    color: var(--text-secondary);
}

.thankyou-steps {
    margin-top: var(--space-xl);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-xl);
    text-align: left;
    max-width: 480px;
    width: 100%;
}

.thankyou-steps-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.thankyou-steps-list {
    padding-left: var(--space-lg);
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.8;
}

.thankyou-cta {
    margin-top: var(--space-xl);
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

@media (max-width: 767px) {
    .thankyou {
        padding-top: calc(var(--nav-height) + var(--space-xl));
    }

    .thankyou-title {
        font-size: 28px;
    }

    .thankyou-cta {
        flex-direction: column;
        align-items: center;
    }

    .thankyou-cta .btn-primary,
    .thankyou-cta .btn-secondary {
        width: 100%;
        max-width: 320px;
    }
}

/* === Legal Pages (Privacy, Terms) === */
.legal {
    padding-top: calc(var(--nav-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
}

.legal-inner {
    max-width: 720px;
    margin: 0 auto;
}

.legal-title {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
}

.legal-updated {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: var(--space-xl);
}

.legal h2 {
    font-size: 22px;
    font-weight: 600;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
}

.legal h3 {
    font-size: 17px;
    font-weight: 600;
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.legal p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.legal ul {
    padding-left: var(--space-lg);
    margin-bottom: var(--space-md);
}

.legal ul li {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    padding: var(--space-xs) 0;
}

.footer-email {
    color: var(--text-secondary);
    transition: color 0.15s;
}

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

.footer-tagline {
    color: var(--text-secondary);
}

@media (max-width: 767px) {
    .legal-title {
        font-size: 28px;
    }
}