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

:root {
    --color-bg: #1e1e28;
    --color-bg-raised: #2a2a35;
    --color-bg-surface: #32323f;
    --color-bg-hover: #3a3a48;
    --color-border: #4e4e6033;
    --color-border-strong: #4e4e6066;
    --color-text: #ececf0;
    --color-text-muted: #a0a0b8;
    --color-text-dim: #787890;
    --color-accent: #8b80e8;
    --color-accent-hover: #9d94f0;
    --color-accent-muted: #8b80e820;

    --font-sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);

    --max-width: 1080px;
    --section-spacing: 120px;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-accent-hover);
}

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

/* ---- Reveal animation ---- */

.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---- Nav ---- */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(30, 30, 40, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text);
    font-weight: 600;
    font-size: 15px;
    letter-spacing: -0.01em;
}

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

.nav-logo img {
    opacity: 0.85;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.nav-github {
    display: flex;
    align-items: center;
    opacity: 0.6;
    transition: opacity 0.2s ease;
}

.nav-github:hover {
    opacity: 1;
}

/* ---- Hero ---- */

.hero {
    position: relative;
    padding: 160px 24px var(--section-spacing);
    max-width: var(--max-width);
    margin: 0 auto;
    overflow: visible;
}

.hero-glow {
    position: absolute;
    top: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(ellipse at center, rgba(139, 128, 232, 0.12) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-accent);
    background: var(--color-accent-muted);
    padding: 5px 12px;
    border-radius: 100px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.025em;
    color: var(--color-text);
    margin-bottom: 20px;
}

.hero-description {
    font-size: 17px;
    line-height: 1.65;
    color: var(--color-text-muted);
    max-width: 480px;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.hero-platforms {
    margin-top: 16px;
    font-size: 13px;
    color: var(--color-text-dim);
}

.hero-screenshot {
    display: flex;
    justify-content: center;
}

.hero-image {
    width: 100%;
    max-width: 420px;
    height: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

/* ---- Buttons ---- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 22px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 2px 12px rgba(139, 128, 232, 0.3);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    color: #fff;
    box-shadow: 0 4px 20px rgba(139, 128, 232, 0.4);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: var(--color-bg-hover);
    color: var(--color-text);
    transform: translateY(-1px);
}

/* ---- Section headers ---- */

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header h2 {
    font-size: clamp(24px, 3.5vw, 32px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-header p {
    font-size: 16px;
    color: var(--color-text-muted);
    max-width: 480px;
    margin: 0 auto;
}

/* ---- Features ---- */

.features {
    padding: var(--section-spacing) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--color-bg-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 32px 28px;
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

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

.feature-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-muted);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ---- Tutorial ---- */

.tutorial {
    padding: var(--section-spacing) 0;
}

.video-wrapper {
    max-width: 800px;
    margin: 0 auto;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

.video-wrapper iframe {
    width: 100%;
    height: 100%;
}

.video-placeholder {
    width: 100%;
    height: 100%;
    background: var(--color-bg-raised);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--color-text-dim);
    font-size: 15px;
}

.video-placeholder svg {
    opacity: 0.4;
}

/* ---- Screenshots ---- */

.screenshots {
    padding: var(--section-spacing) 0;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.screenshot-slot {
    position: relative;
    background: var(--color-bg-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.screenshot-slot:hover {
    border-color: var(--color-border-strong);
    box-shadow: var(--shadow-md);
}

.screenshot-slot img {
    width: 100%;
    height: auto;
    display: block;
}

.screenshot-slot span {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px 16px;
    background: linear-gradient(transparent, rgba(30, 30, 40, 0.85));
    color: var(--color-text-muted);
    font-size: 13px;
    font-weight: 500;
}

/* ---- FAQ ---- */

.faq {
    padding: var(--section-spacing) 0;
}

.faq-list {
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.faq-item {
    background: var(--color-bg-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.25s ease;
}

.faq-item[open] {
    border-color: var(--color-border-strong);
}

.faq-item summary {
    padding: 18px 24px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    transition: color 0.2s ease;
    user-select: none;
}

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

.faq-item summary::after {
    content: "";
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%23787890' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    transition: transform 0.25s ease;
}

.faq-item[open] summary::after {
    transform: rotate(180deg);
}

.faq-item summary:hover {
    color: var(--color-accent);
}

.faq-answer {
    padding: 0 24px 20px;
}

.faq-answer p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.faq-answer a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.faq-answer code {
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 13px;
    background: var(--color-bg);
    padding: 2px 7px;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    word-break: break-all;
}

.faq-answer p + p {
    margin-top: 10px;
}

/* ---- Footer ---- */

.footer {
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
    margin-top: var(--section-spacing);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--color-text-muted);
}

.footer-brand img {
    opacity: 0.5;
}

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

.footer-links a {
    font-size: 13px;
    color: var(--color-text-dim);
}

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

.footer-copy {
    font-size: 13px;
    color: var(--color-text-dim);
}

/* ---- Lightbox ---- */

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(10, 10, 14, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
    opacity: 0;
    pointer-events: none;
    cursor: pointer;
    transition: opacity 0.25s ease;
}

.lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox img {
    max-width: 100%;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.5);
    transform: scale(0.95);
    transition: transform 0.25s ease;
}

.lightbox.active img {
    transform: scale(1);
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
    :root {
        --section-spacing: 80px;
    }

    .hero {
        padding-top: 120px;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

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

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

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

    .nav-links a:not(.nav-github) {
        display: none;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 28px;
    }

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

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