@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

  :root {
    --bg: #0a0e1a;
    --surface: #131829;
    --border: rgba(255,255,255,0.06);
    --text: #e2e8f0;
    --text-dim: #64748b;
    --blue: #3b82f6;
    --cyan: #06b6d4;
    --green: #22c55e;
    --red: #ef4444;
    --orange: #f59e0b;
  }

  body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    overflow: hidden;
  }

  .container {
    width: 100%;
    max-width: 380px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }

  h1 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-dim);
  }

  /* ── Progress Ring ── */
  .ring-wrapper {
    position: relative;
    width: 260px;
    height: 260px;
  }

  .ring-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
  }

  .ring-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 8;
  }

  .ring-fg {
    fill: none;
    stroke: url(#grad);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.4s ease;
  }

  .ring-center {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
  }

  .countdown {
    font-size: 3.2rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    background: linear-gradient(135deg, var(--blue), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .countdown.idle {
    font-size: 1.6rem;
    background: none;
    -webkit-text-fill-color: var(--text-dim);
  }

  .countdown-label {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
  }

  /* ── Status Badge ── */
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.4rem;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    border: 1px solid var(--border);
    background: var(--surface);
  }

  .badge .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
  }

  .badge.running .dot {
    background: var(--cyan);
    box-shadow: 0 0 8px var(--cyan);
    animation: pulse-dot 1.5s ease-in-out infinite;
  }

  .badge.open .dot {
    background: var(--green);
    box-shadow: 0 0 8px var(--green);
  }

  .badge.closed .dot {
    background: var(--red);
    box-shadow: 0 0 6px var(--red);
  }

  .badge.counting .dot {
    background: var(--orange);
    box-shadow: 0 0 8px var(--orange);
    animation: pulse-dot 0.8s ease-in-out infinite;
  }

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

  /* ── Info row ── */
  .info {
    display: flex;
    gap: 1.5rem;
  }

  .info-item {
    text-align: center;
  }

  .info-value {
    font-size: 1.3rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
  }

  .info-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 0.15rem;
  }

  /* ── Glow effect behind ring ── */
  .glow {
    position: absolute;
    inset: 20px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(6,182,212,0.12) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.6s ease;
    pointer-events: none;
  }

  .glow.active {
    opacity: 1;
  }

  /* ── Controls ── */
  .controls {
    display: flex;
    gap: 0.6rem;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .run-container {
    display: flex;
    width: 100%;
    gap: 0.6rem;
  }

  #btn-run {
    flex-grow: 1;
    font-size: 1.4rem;
    padding: 1.2rem;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.65rem 1.2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
  }

  .btn:hover {
    background: rgba(59,130,246,0.12);
    border-color: var(--blue);
  }

  .btn:active {
    transform: scale(0.96);
  }

  .btn.primary {
    background: linear-gradient(135deg, var(--blue), var(--cyan));
    border-color: transparent;
    color: #fff;
  }

  .btn.primary:hover {
    filter: brightness(1.15);
    background: linear-gradient(135deg, var(--blue), var(--cyan));
  }

  .btn.danger {
    border-color: rgba(239,68,68,0.3);
  }

  .btn.danger:hover {
    background: rgba(239,68,68,0.15);
    border-color: var(--red);
  }

  .btn.success {
    border-color: rgba(34,197,94,0.3);
  }

  .btn.success:hover {
    background: rgba(34,197,94,0.15);
    border-color: var(--green);
  }

  .btn:disabled {
    opacity: 0.45;
    pointer-events: none;
  }

  .dur-input-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0 0.8rem;
    transition: border-color 0.15s ease;
  }

  .dur-input-group:focus-within {
    border-color: var(--blue);
  }

  .dur-input {
    width: 64px;
    background: transparent;
    border: none;
    color: var(--text);
    font-family: inherit;
    font-size: 1.2rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    padding: 0.8rem 0;
    outline: none;
    text-align: right;
  }

  .dur-input::-webkit-inner-spin-button { opacity: 0.3; }

  .dur-unit {
    font-size: 0.85rem;
    color: var(--text-dim);
    font-weight: 500;
  }