/* ============================================================
   Flappy Bird — Sunny Sky Theme
   accent: #FCD34D (amber/yellow)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;700;800&family=DM+Sans:wght@400;500;600&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
    --fb-accent: #FCD34D;
    --fb-accent-dark: #F59E0B;
    --fb-accent-glow: rgba(252, 211, 77, 0.30);
    --fb-sky: #87CEEB;
    --fb-sky-dark: #5BA3C9;
    --fb-pipe: #4ADE80;
    --fb-pipe-dark: #16A34A;
    --fb-bg: #0c0d10;
    --fb-surface: #141620;
    --fb-surface2: #1e2132;
    --fb-border: rgba(252, 211, 77, 0.15);
    --fb-border-strong: rgba(252, 211, 77, 0.35);
    --fb-text: #f5f5f5;
    --fb-text-dim: rgba(255, 255, 255, 0.55);
    --fb-text-muted: rgba(255, 255, 255, 0.28);
    --fb-radius: 14px;
    --fb-transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Layout ── */
.fb-layout {
    display: flex;
    justify-content: center;
    gap: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 1rem;
    min-height: calc(100vh - 60px);
    align-items: flex-start;
}

.fb-ad-slot { width: 160px; flex-shrink: 0; display: flex; align-items: flex-start; padding-top: 0.5rem; }
.fb-ad-placeholder--vertical {
    width: 160px;
    height: 600px;
    background: var(--fb-surface);
    border: 1px dashed rgba(252, 211, 77, 0.12);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--fb-text-muted);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
}

/* ── App Container ── */
#fb-app {
    flex: 1;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ── Screens ── */
.fb-screen { display: none; width: 100%; }
.fb-screen.active { display: flex; flex-direction: column; align-items: center; }

/* ═══════════════════════════════════════════
   MENU SCREEN
   ═══════════════════════════════════════════ */
.fb-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-top: 0.5rem;
}

.fb-logo-bird {
    display: flex;
    justify-content: center;
    margin-bottom: 0.5rem;
}

.fb-header h1 {
    font-family: 'Syne', sans-serif;
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--fb-accent);
    letter-spacing: 0.08em;
    text-shadow: 0 0 40px var(--fb-accent-glow), 0 2px 0 rgba(0,0,0,0.5);
    margin: 0;
    line-height: 1;
}

.fb-subtitle {
    font-family: 'DM Sans', sans-serif;
    color: var(--fb-text-dim);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    letter-spacing: 0.03em;
}

/* Best Score Box */
.fb-bestbox {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--fb-surface2);
    border: 1px solid var(--fb-border-strong);
    border-radius: var(--fb-radius);
    padding: 0.75rem 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 0 20px rgba(252, 211, 77, 0.08);
}
.fb-bestbox__label {
    font-family: 'Syne', sans-serif;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--fb-text-muted);
    text-transform: uppercase;
}
.fb-bestbox__score {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2rem;
    font-weight: 700;
    color: var(--fb-accent);
    text-shadow: 0 0 20px var(--fb-accent-glow);
    min-width: 3ch;
    text-align: center;
}

/* Medals */
.fb-medals {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.75rem;
    flex-wrap: wrap;
    justify-content: center;
}
.fb-medal {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    background: var(--fb-surface);
    border: 1px solid var(--fb-border);
    border-radius: 10px;
    padding: 0.6rem 0.9rem;
    min-width: 70px;
    transition: border-color var(--fb-transition), box-shadow var(--fb-transition);
}
.fb-medal__icon {
    font-size: 1.4rem;
    filter: grayscale(0.6);
}
.fb-medal__label {
    font-family: 'Syne', sans-serif;
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}
.fb-medal__req {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: var(--fb-text-muted);
}
.fb-medal--bronze { --medal-color: #CD7F32; }
.fb-medal--silver { --medal-color: #C0C0C0; }
.fb-medal--gold   { --medal-color: #FFD700; }
.fb-medal--platinum { --medal-color: #E5E4E2; }
.fb-medal--bronze .fb-medal__label { color: #CD7F32; }
.fb-medal--silver .fb-medal__label { color: #C0C0C0; }
.fb-medal--gold   .fb-medal__label { color: #FFD700; }
.fb-medal--platinum .fb-medal__label { color: #E5E4E2; }
.fb-medal.earned {
    border-color: var(--medal-color);
    box-shadow: 0 0 12px rgba(255,215,0,0.2);
}
.fb-medal.earned .fb-medal__icon { filter: grayscale(0); }

/* Menu buttons */
.fb-menu-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    max-width: 280px;
    margin-bottom: 1rem;
}

/* Controls hint */
.fb-controls-hint {
    font-size: 0.75rem;
    color: var(--fb-text-muted);
    letter-spacing: 0.04em;
    text-align: center;
}

/* ═══════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════ */
.fb-btn {
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.06em;
    border: none;
    border-radius: var(--fb-radius);
    cursor: pointer;
    transition: all var(--fb-transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    text-transform: uppercase;
    padding: 0.7rem 1.5rem;
    white-space: nowrap;
}
.fb-btn--lg { padding: 0.9rem 2rem; font-size: 1rem; }
.fb-btn--sm { padding: 0.4rem 1rem; font-size: 0.75rem; }
.fb-btn--primary {
    background: var(--fb-accent);
    color: #1a1200;
    box-shadow: 0 4px 20px var(--fb-accent-glow);
}
.fb-btn--primary:hover {
    background: var(--fb-accent-dark);
    box-shadow: 0 6px 28px rgba(252, 211, 77, 0.5);
    transform: translateY(-1px);
}
.fb-btn--primary:active { transform: translateY(0); }
.fb-btn--outline {
    background: transparent;
    color: var(--fb-text);
    border: 1.5px solid var(--fb-border-strong);
}
.fb-btn--outline:hover {
    border-color: var(--fb-accent);
    color: var(--fb-accent);
    background: var(--fb-accent-glow);
}
.fb-btn--ghost {
    background: transparent;
    color: var(--fb-text-dim);
    border: 1px solid transparent;
}
.fb-btn--ghost:hover {
    color: var(--fb-accent);
    background: rgba(252, 211, 77, 0.06);
}

/* ═══════════════════════════════════════════
   GAME SCREEN
   ═══════════════════════════════════════════ */
.fb-hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0 0.25rem 0.5rem;
}

.fb-score-display {
    font-family: 'JetBrains Mono', monospace;
    font-size: 3rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 2px 8px rgba(0,0,0,0.8), 0 0 20px rgba(252,211,77,0.3);
    line-height: 1;
    min-width: 4ch;
    text-align: center;
    width: 100%;
    position: relative;
}

.fb-best-hud {
    display: none; /* shown during game */
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: rgba(255,255,255,0.5);
    position: absolute;
    right: 0;
    top: 0;
}

.fb-canvas-wrap {
    position: relative;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 8px 40px rgba(0,0,0,0.6), 0 0 0 2px rgba(252,211,77,0.1);
    width: 100%;
}

#game-canvas {
    display: block;
    width: 100%;
    height: auto;
    background: #87CEEB;
    border-radius: 18px;
}

.fb-flash {
    position: absolute;
    inset: 0;
    background: white;
    opacity: 0;
    pointer-events: none;
    border-radius: 18px;
    transition: opacity 0.05s;
}
.fb-flash.active {
    opacity: 0.8;
}

/* ═══════════════════════════════════════════
   GAME OVER SCREEN
   ═══════════════════════════════════════════ */
.fb-result-card {
    width: 100%;
    max-width: 380px;
    background: var(--fb-surface);
    border: 1px solid var(--fb-border-strong);
    border-radius: 20px;
    padding: 1.75rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 8px 40px rgba(0,0,0,0.5), 0 0 40px rgba(252,211,77,0.06);
    margin-top: 1rem;
}

.fb-result-header h2 {
    font-family: 'Syne', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    color: var(--fb-accent);
    letter-spacing: 0.1em;
    text-align: center;
    text-shadow: 0 0 30px var(--fb-accent-glow);
}

.fb-result-scores {
    width: 100%;
    background: var(--fb-surface2);
    border-radius: var(--fb-radius);
    padding: 0.875rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.fb-result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.85rem;
    color: var(--fb-text-dim);
    letter-spacing: 0.05em;
}

.fb-result-val {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--fb-text);
}
.fb-result-row:first-child .fb-result-val { color: var(--fb-accent); }

.fb-medal-display {
    font-size: 2.5rem;
    min-height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    filter: drop-shadow(0 0 12px rgba(255,215,0,0.4));
}

.fb-medal-display .medal-name {
    font-family: 'Syne', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
}

.fb-nickname-row {
    width: 100%;
}
.fb-nickname-row input {
    width: 100%;
    background: var(--fb-surface2);
    border: 1.5px solid var(--fb-border);
    border-radius: var(--fb-radius);
    color: var(--fb-text);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.9rem;
    padding: 0.65rem 1rem;
    outline: none;
    transition: border-color var(--fb-transition);
}
.fb-nickname-row input::placeholder { color: var(--fb-text-muted); }
.fb-nickname-row input:focus { border-color: var(--fb-accent); }

.fb-result-actions {
    display: flex;
    gap: 0.75rem;
    width: 100%;
}
.fb-result-actions .fb-btn { flex: 1; }

.fb-save-msg {
    font-size: 0.8rem;
    color: var(--fb-accent);
    min-height: 1.2em;
    text-align: center;
    font-family: 'DM Sans', sans-serif;
}

/* ═══════════════════════════════════════════
   LEADERBOARD SCREEN
   ═══════════════════════════════════════════ */
.fb-lb-card {
    width: 100%;
    max-width: 420px;
    background: var(--fb-surface);
    border: 1px solid var(--fb-border-strong);
    border-radius: 20px;
    padding: 1.75rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    margin-top: 1rem;
    box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

.fb-lb-card h2 {
    font-family: 'Syne', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--fb-accent);
    letter-spacing: 0.1em;
    text-align: center;
}

.fb-lb-list {
    width: 100%;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    max-height: 420px;
    overflow-y: auto;
    padding: 0;
}

.fb-lb-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.875rem;
    background: var(--fb-surface2);
    border-radius: 10px;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.875rem;
    border: 1px solid transparent;
    transition: border-color var(--fb-transition);
}
.fb-lb-list li:hover { border-color: var(--fb-border); }

.fb-lb-rank {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--fb-text-muted);
    min-width: 1.5rem;
    text-align: right;
}
.fb-lb-rank.top1 { color: #FFD700; font-size: 1rem; }
.fb-lb-rank.top2 { color: #C0C0C0; font-size: 0.9rem; }
.fb-lb-rank.top3 { color: #CD7F32; font-size: 0.85rem; }

.fb-lb-nickname {
    flex: 1;
    color: var(--fb-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.fb-lb-score {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: var(--fb-accent);
    font-size: 1rem;
}

.fb-lb-empty {
    text-align: center;
    color: var(--fb-text-muted);
    padding: 2rem;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.875rem;
}

/* ═══════════════════════════════════════════
   MOBILE
   ═══════════════════════════════════════════ */
@media (max-width: 820px) {
    .fb-ad-slot--left,
    .fb-ad-slot--right { display: none; }
}

@media (max-width: 600px) {
    .fb-layout { padding: 0.75rem 0.5rem; }
    .fb-header h1 { font-size: 2.2rem; }
    .fb-score-display { font-size: 2.2rem; }
    .fb-result-card { padding: 1.25rem 1rem; }
    .fb-canvas-wrap { border-radius: 12px; }
    #game-canvas { border-radius: 12px; }
    .fb-flash { border-radius: 12px; }
    .fb-medals { gap: 0.4rem; }
    .fb-medal { padding: 0.5rem 0.5rem; min-width: 58px; }
}