:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --text-primary: #f0f0f5;
    --text-secondary: #8888a0;
    --accent-green: #00ff88;
    --accent-red: #ff4466;
    --accent-blue: #4488ff;
    --border-subtle: rgba(255, 255, 255, 0.06);
    --glow-green: rgba(0, 255, 136, 0.15);
    --glow-red: rgba(255, 68, 102, 0.15);
}

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

body {
    font-family: ui-monospace, 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    background-image: 
        radial-gradient(ellipse at 20% 0%, rgba(68, 136, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(0, 255, 136, 0.05) 0%, transparent 50%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-top: 0.5rem;
}

.last-update {
    margin-top: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.refresh-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    width: 28px;
    height: 28px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.refresh-btn:hover {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
    transform: rotate(90deg);
}

.refresh-btn.loading {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.indices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.75rem;
}

.index-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    padding: 1rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.index-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-blue);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.index-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.1);
}

.index-card:hover::before {
    opacity: 1;
}

.index-card.positive::before {
    background: var(--accent-green);
}

.index-card.negative::before {
    background: var(--accent-red);
}

.index-card.positive:hover {
    box-shadow: 0 8px 32px var(--glow-green);
}

.index-card.negative:hover {
    box-shadow: 0 8px 32px var(--glow-red);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.index-name {
    font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
}

.index-flag {
    font-size: 1.1rem;
}

.index-price {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    letter-spacing: -0.02em;
}

.index-change {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
}

.change-value {
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
}

.positive .change-value {
    background: var(--glow-green);
    color: var(--accent-green);
}

.negative .change-value {
    background: var(--glow-red);
    color: var(--accent-red);
}

.change-percent {
    color: var(--text-secondary);
}

.positive .change-percent {
    color: var(--accent-green);
}

.negative .change-percent {
    color: var(--accent-red);
}

.index-year-performance {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-subtle);
    font-size: 0.7rem;
}

.year-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.year-change {
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.year-change.up {
    color: var(--accent-green);
    background: var(--glow-green);
}

.year-change.down {
    color: var(--accent-red);
    background: var(--glow-red);
}

.year-range {
    color: var(--text-secondary);
    font-size: 0.7rem;
    margin-left: auto;
    opacity: 0.7;
}

.loading-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 1s linear infinite;
}

.error-card {
    opacity: 0.5;
}

.error-card .index-price {
    color: var(--text-secondary);
    font-size: 1rem;
}

footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.75rem;
}

footer a {
    color: var(--accent-blue);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

footer .version {
    margin-top: 0.5rem;
    font-size: 0.65rem;
    opacity: 0.5;
}

@media (max-width: 640px) {
    .container {
        padding: 1.5rem 1rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .indices-grid {
        grid-template-columns: 1fr;
    }
}