/* RL Dungeon — Landing page styles (web/index.html).
 * 게임 본체 (web/play.html / css/style.css) 와 분리. :root 변수는 동일 톤 복제.
 */

:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --accent: #e94560;
    --text-primary: #eee;
    --text-secondary: #aaa;
    --text-muted: #888;
    --success: #4ade80;
    --warning: #fbbf24;
    --border: rgba(255, 255, 255, 0.08);
}

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

html, body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.landing-body {
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
}

/* === Top bar (lang toggle 만) === */
.landing-topbar {
    display: flex;
    justify-content: flex-end;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

.lang-toggle {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}

.lang-toggle:hover {
    border-color: var(--accent);
    background: rgba(233, 69, 96, 0.08);
}

/* === Hero === */
.landing-hero {
    text-align: center;
    padding: 80px 24px 64px;
    width: 100%;
    max-width: 880px;
    margin: 0 auto;
}

.hero-logo {
    font-size: clamp(2.6rem, 7vw, 4.5rem);
    font-weight: 800;
    letter-spacing: 0.04em;
    color: var(--accent);
    text-shadow: 0 0 32px rgba(233, 69, 96, 0.35);
    margin-bottom: 18px;
}

.hero-tagline {
    font-size: clamp(1.05rem, 2.2vw, 1.35rem);
    color: var(--text-primary);
    margin-bottom: 10px;
    font-weight: 500;
}

.hero-subtagline {
    font-size: clamp(0.95rem, 1.6vw, 1.05rem);
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.15s, background 0.15s;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 16px rgba(233, 69, 96, 0.25);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(233, 69, 96, 0.4);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border);
}

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

/* === Section common === */
.landing-section {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 48px 24px;
}

.landing-section h2 {
    font-size: clamp(1.4rem, 3vw, 1.8rem);
    color: var(--text-primary);
    margin-bottom: 24px;
    text-align: center;
    letter-spacing: 0.01em;
}

/* === Concept grid === */
.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
}

.concept-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: border-color 0.15s, transform 0.15s;
}

.concept-card:hover {
    border-color: rgba(233, 69, 96, 0.4);
    transform: translateY(-2px);
}

.concept-card h3 {
    font-size: 1.1rem;
    color: var(--accent);
    margin-bottom: 10px;
    letter-spacing: 0.01em;
}

.concept-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* === Screenshots === */
.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    margin-bottom: 12px;
}

.screenshot-figure {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    object-position: center top;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: block;
}

.muted {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
}

/* === Quickstart === */
.quickstart-list {
    list-style: none;
    max-width: 640px;
    margin: 0 auto;
    padding: 0;
}

.quickstart-list li {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 18px;
    margin-bottom: 10px;
    font-size: 0.98rem;
    color: var(--text-primary);
}

.quickstart-list li::before {
    content: '▸';
    color: var(--accent);
    margin-right: 10px;
    font-weight: 600;
}

/* === Footer === */
.landing-footer {
    margin-top: auto;
    padding: 40px 24px 32px;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.landing-footer p {
    margin-bottom: 6px;
}

.landing-footer .footnote {
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 18px;
}

.landing-footer a {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--border);
    text-underline-offset: 2px;
    transition: text-decoration-color 0.15s;
}

.landing-footer a:hover {
    text-decoration-color: var(--accent);
}

/* === Mobile === */
@media (max-width: 600px) {
    .landing-topbar {
        padding: 12px 16px;
    }

    .lang-toggle {
        padding: 5px 12px;
        font-size: 0.85rem;
    }

    .landing-hero {
        padding: 56px 20px 40px;
    }

    .landing-section {
        padding: 36px 20px;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 280px;
    }

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

    .concept-card {
        padding: 20px;
    }

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

    .screenshot-figure {
        aspect-ratio: 16 / 9;
    }

    .quickstart-list li {
        padding: 12px 14px;
        font-size: 0.92rem;
    }
}