/* ===========================================================
   Bitcoin Price Tracker — Dark Luxury Aesthetic
   =========================================================== */

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

:root {
    --bg: #09080b;
    --bg-elevated: #121017;
    --panel: #16131c;
    --border: #2a2433;
    --grain-opacity: 0.05;

    --gold: #c9a84c;
    --gold-dim: #8a6820;
    --gold-bright: #f0d27a;

    --text: #f5f1ea;
    --muted: #b8aec2;
    --muted2: #9a8aaa;

    --up: #4fd884;
    --up-bright: #7dffb0;
    --down: #ff6b6b;
    --down-bright: #ff9b9b;

    --font-display: 'Cinzel', serif;
    --font-ui: 'Syne', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

html[data-theme="light"] {
    --bg: #f2ede8;
    --bg-elevated: #ffffff;
    --panel: #fbf8f4;
    --border: #ddd3c5;
    --grain-opacity: 0.03;

    --gold: #8a6820;
    --gold-dim: #b8923f;
    --gold-bright: #6b4f17;

    --text: #211c28;
    --muted: #5b5266;
    --muted2: #6b5f78;

    --up: #1c8c4c;
    --up-bright: #15693a;
    --down: #c43a3a;
    --down-bright: #9c2c2c;
}

* { box-sizing: border-box; }

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-ui);
    overflow-x: hidden;
    position: relative;
    transition: background 0.3s ease, color 0.3s ease;
}

/* Grain overlay */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 999;
    pointer-events: none;
    mix-blend-mode: soft-light;
    opacity: var(--grain-opacity);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 220px 220px;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 2.2vh 3vw;
}

/* ---------- Header ---------- */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 1.6vh;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2vh;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.brand-symbol {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 2.4vw, 3rem);
    color: var(--gold);
    border: 1.5px solid var(--gold-dim);
    border-radius: 50%;
    width: clamp(2.6rem, 3.4vw, 4.2rem);
    height: clamp(2.6rem, 3.4vw, 4.2rem);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.brand-text h1 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: 0.08em;
    font-size: clamp(1.2rem, 1.8vw, 2rem);
    margin: 0;
    color: var(--text);
}

.brand-text p {
    margin: 0.2rem 0 0;
    font-size: clamp(0.65rem, 0.9vw, 0.85rem);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--muted2);
}

.controls {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.status-pill {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: clamp(0.7rem, 0.85vw, 0.85rem);
    color: var(--muted);
    padding: 0.5rem 0.9rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--panel);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--up);
    box-shadow: 0 0 8px var(--up);
}

.status-dot.stale { background: var(--muted2); box-shadow: none; }

.btn {
    font-family: var(--font-ui);
    font-weight: 700;
    letter-spacing: 0.05em;
    font-size: clamp(0.7rem, 0.85vw, 0.85rem);
    text-transform: uppercase;
    padding: 0.65rem 1.2rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    border-color: var(--gold-dim);
    color: var(--gold-bright);
}

.btn.active {
    background: linear-gradient(135deg, var(--gold-dim), var(--gold));
    color: #100c05;
    border-color: var(--gold);
}

.btn-icon {
    width: clamp(2.4rem, 2.8vw, 3rem);
    height: clamp(2.4rem, 2.8vw, 3rem);
    padding: 0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1rem, 1.2vw, 1.3rem);
}

/* ---------- Hero Price ---------- */
.hero {
    flex: 1.3;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding: 1vh 0 2vh;
}

.hero-label {
    font-family: var(--font-ui);
    font-weight: 700;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    font-size: clamp(0.75rem, 1.1vw, 1.1rem);
    color: var(--muted2);
    margin-bottom: 1vh;
}

.hero-price {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: clamp(4.5rem, 11vw, 11rem);
    line-height: 1;
    color: var(--text);
    text-shadow: 0 0 60px rgba(201, 168, 76, 0.18);
    letter-spacing: -0.01em;
    display: flex;
    align-items: flex-start;
}

.hero-price .currency {
    font-size: 0.35em;
    color: var(--gold);
    margin-right: 0.15em;
    margin-top: 0.18em;
    font-family: var(--font-ui);
    font-weight: 800;
}

.hero-price .cents {
    font-size: 0.45em;
    color: var(--muted);
    margin-top: 0.1em;
}

.hero-change {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 2vh;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: clamp(1.6rem, 3vw, 3rem);
}

.hero-change .arrow {
    font-size: 1.1em;
    line-height: 1;
}

.hero-change.up { color: var(--up-bright); }
.hero-change.down { color: var(--down-bright); }
.hero-change.flat { color: var(--muted); }

.hero-change .pct {
    padding: 0.2rem 0.9rem;
    border-radius: 999px;
    background: rgba(255,255,255,0.04);
    border: 1px solid currentColor;
    font-size: 0.6em;
}

.hero-updated {
    margin-top: 1.6vh;
    font-family: var(--font-mono);
    font-size: clamp(0.7rem, 0.9vw, 0.95rem);
    color: var(--muted2);
    letter-spacing: 0.05em;
}

/* ---------- Stats Grid ---------- */
.stats {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.4rem;
    margin-top: 1vh;
}

.stat-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 1.1rem;
    padding: 1.8vh 1.6vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    opacity: 0.6;
}

.stat-label {
    font-family: var(--font-ui);
    font-weight: 700;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    font-size: clamp(0.65rem, 0.85vw, 0.9rem);
    color: var(--muted2);
    margin-bottom: 0.9vh;
}

.stat-value {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: clamp(1.8rem, 3.4vw, 3.4rem);
    color: var(--gold-bright);
    line-height: 1.1;
}

.stat-value.high { color: var(--up-bright); }
.stat-value.low { color: var(--down-bright); }

.stat-sub {
    margin-top: 0.6vh;
    font-family: var(--font-mono);
    font-size: clamp(0.7rem, 0.9vw, 1rem);
    color: var(--muted);
}

/* ---------- Footer ---------- */
.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.4vh;
    margin-top: 1.4vh;
    border-top: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: clamp(0.65rem, 0.85vw, 0.85rem);
    color: var(--muted2);
}

.error-banner {
    display: none;
    background: rgba(255, 107, 107, 0.12);
    border: 1px solid var(--down);
    color: var(--down-bright);
    padding: 0.8rem 1.2rem;
    border-radius: 0.8rem;
    font-family: var(--font-mono);
    font-size: clamp(0.75rem, 0.95vw, 0.95rem);
    margin-bottom: 1.4vh;
    text-align: center;
}

.error-banner.show { display: block; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.loading .hero-price,
.loading .stat-value {
    animation: pulse 1.4s ease-in-out infinite;
}

@media (max-width: 900px) {
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
    .brand-text p { display: none; }
}