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

:root {
    --bg: #050505;
    --surface: #111111;
    --border: #1a1a1a;
    --text: #f5f5f5;
    --text-secondary: #aaa;
    --lived: #3a3a3a;
    --remaining: #22c55e;
    --current: #ffffff;
    --accent: #22c55e;
    --accent-dim: #166534;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

.app {
    max-width: 520px;
    margin: 0 auto;
    padding: 2rem 1.25rem 3rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.4rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* Form */
#settings {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.field {
    margin-bottom: 1.25rem;
}

.field label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.field input {
    width: 100%;
    padding: 0.7rem 0.8rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
    -webkit-appearance: none;
}

.field input:focus {
    border-color: var(--accent);
}

.field input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    opacity: 0.5;
}

button[type="submit"],
.download-btn {
    width: 100%;
    padding: 0.9rem;
    background: var(--accent);
    color: #000;
    border: none;
    border-radius: 12px;
    font-size: 1.05rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}

button[type="submit"]:hover,
.download-btn:hover {
    opacity: 0.9;
}

button[type="submit"]:active,
.download-btn:active {
    transform: scale(0.98);
}

/* Result */
#result {
    transition: opacity 0.4s ease, transform 0.4s ease;
}

#result.hidden {
    display: none;
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem 0.5rem;
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    margin-bottom: 0.25rem;
}

.stat:nth-child(2) .stat-value {
    color: var(--accent);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Preview */
.preview-wrapper {
    margin-bottom: 1.25rem;
}

.preview-container {
    background: #000;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border);
}

#preview {
    display: block;
    width: 100%;
    height: auto;
}

/* Legend */
.legend {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.legend-box {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    display: inline-block;
}

.legend-box.lived {
    background: var(--lived);
}

.legend-box.current {
    background: var(--current);
}

.legend-box.remaining {
    background: var(--remaining);
}

/* Download */
.download-section {
    text-align: center;
}

.download-hint {
    margin-top: 0.6rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 400px) {
    .app {
        padding: 1.25rem 1rem 2rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .stats {
        gap: 0.4rem;
    }

    .stat {
        padding: 0.75rem 0.25rem;
    }

    .stat-value {
        font-size: 1.1rem;
    }
}