:root {
    --bg: #14161b;
    --card: #1b1e25;
    --line: #2a2e37;
    --text: #e8eaed;
    --muted: #9aa0aa;
    --accent: #5bd6a0;
    --accent-ink: #06281c;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    color: var(--text);
    padding: 24px;
}

.app {
    width: 100%;
    max-width: 420px;
    text-align: center;
}

.modes {
    display: flex;
    gap: 6px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 6px;
    margin-bottom: 36px;
}

.mode {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--muted);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode:hover { color: var(--text); }
.mode.active { background: var(--accent); color: var(--accent-ink); font-weight: 600; }

.clock { position: relative; width: 260px; height: 260px; margin: 0 auto 36px; }

.ring { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring-track { fill: none; stroke: var(--line); stroke-width: 10; }
.ring-fill {
    fill: none;
    stroke: var(--accent);
    stroke-width: 10;
    stroke-linecap: round;
    stroke-dasharray: 628;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear;
}

.readout {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.time { font-size: 3.6rem; font-weight: 700; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.label { color: var(--muted); font-size: 0.95rem; margin-top: 6px; }

.controls { display: flex; gap: 10px; justify-content: center; margin-bottom: 28px; }

.btn {
    padding: 12px 22px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--card);
    color: var(--text);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; min-width: 110px; }
.btn.primary:hover { transform: translateY(-1px); }

.dots { display: flex; gap: 8px; justify-content: center; min-height: 12px; margin-bottom: 30px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.dot.done { background: var(--accent); }

.settings-open {
    background: none;
    border: none;
    color: var(--muted);
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: underline;
}
.settings-open:hover { color: var(--text); }

.panel {
    margin-top: 22px;
    text-align: left;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 20px;
}

.panel h2 { font-size: 1rem; margin-bottom: 16px; }
.panel label { display: block; font-size: 0.9rem; color: var(--muted); margin-bottom: 14px; }
.panel label.row { display: flex; align-items: center; gap: 8px; }
.panel input[type="number"] {
    width: 70px;
    margin-left: 8px;
    padding: 6px 8px;
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: 6px;
    color: var(--text);
}

@media (max-width: 420px) {
    .clock { width: 220px; height: 220px; }
    .time { font-size: 3rem; }
}