:root {
    --bg:           #f7f7f7;
    --surface:      #ffffff;
    --border:       #e2e2e2;
    --border-dark:  #c8c8c8;
    --text:         #0d0d0d;
    --muted:        #6b6b6b;
    --accent:       #e8630a;
    --accent-hover: #cf550a;
    --accent-soft:  #fff4ee;
    --accent-glow:  rgba(232,99,10,0.18);
    --green:        #16a34a;
    --green-soft:   #f0fdf4;
    --green-glow:   rgba(22,163,74,0.2);
    --red:          #dc2626;
    --red-soft:     #fff1f1;
    --shadow:       0 2px 20px rgba(0,0,0,0.06), 0 1px 4px rgba(0,0,0,0.04);
    --radius:       18px;
    --radius-sm:    11px;
    --radius-xs:    7px;
    --font:         'DM Sans', sans-serif;

    --card-px:         clamp(16px, 5vw, 28px);
    --card-py-header:  clamp(18px, 4vw, 26px);
    --card-py-body:    clamp(18px, 4vw, 24px);
    --gap-body:        clamp(16px, 4vw, 20px);
  }

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

  body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: clamp(16px, 4vw, 32px) clamp(14px, 4vw, 20px);
    -webkit-font-smoothing: antialiased;
  }

  /* ── Animated background orb ── */
  body::before {
    content: '';
    position: fixed;
    top: -200px; right: -200px;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(232,99,10,0.07) 0%, transparent 65%);
    border-radius: 50%;
    pointer-events: none;
    animation: orbFloat 8s ease-in-out infinite;
    z-index: 0;
  }
  body::after {
    content: '';
    position: fixed;
    bottom: -150px; left: -150px;
    width: 450px; height: 450px;
    background: radial-gradient(circle, rgba(232,99,10,0.04) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: orbFloat 11s ease-in-out infinite reverse;
    z-index: 0;
  }
  @keyframes orbFloat {
    0%, 100% { transform: translateY(0) scale(1); }
    50%       { transform: translateY(20px) scale(1.04); }
  }

  /* ── Card ── */
  .card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    width: 100%;
    max-width: 480px;
    overflow: hidden;
    position: relative;
    z-index: 1;
    animation: cardIn 0.5s cubic-bezier(0.22,1,0.36,1) both;
  }
  @keyframes cardIn {
    from { opacity: 0; transform: translateY(22px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
  }

  /* Subtle top accent stripe */
  .card::before {
    content: '';
    display: block;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, #f59e0b 60%, transparent 100%);
    border-radius: var(--radius) var(--radius) 0 0;
  }

  /* ── Header ── */
  .card-header {
    padding: var(--card-py-header) var(--card-px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: clamp(10px, 3vw, 14px);
  }

  /* Solstice sun logo mark */
  .logo-mark {
    width: clamp(38px, 10vw, 46px);
    height: clamp(38px, 10vw, 46px);
    background: var(--accent-soft);
    border: 1.5px solid rgba(232,99,10,0.22);
    border-radius: 12px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
    box-shadow: 0 4px 14px var(--accent-glow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }
  .logo-mark:hover {
    transform: rotate(15deg) scale(1.08);
    box-shadow: 0 6px 22px rgba(232,99,10,0.28);
  }
  .logo-mark svg {
    width: clamp(20px, 5.5vw, 26px);
    height: clamp(20px, 5.5vw, 26px);
  }

  .header-info { flex: 1; min-width: 0; }
  .header-info h1 {
    font-size: clamp(0.95rem, 4vw, 1.15rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .header-info h1 span { color: var(--accent); }
  .header-info p {
    font-size: clamp(0.68rem, 2.5vw, 0.76rem);
    color: var(--muted);
    margin-top: 2px;
    font-weight: 400;
  }

  /* Brand badge */
  .brand-badge {
    font-size: 0.64rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid rgba(232,99,10,0.2);
    padding: 4px 10px;
    border-radius: 999px;
    flex-shrink: 0;
    white-space: nowrap;
  }

  /* ── Body ── */
  .card-body {
    padding: var(--card-py-body) var(--card-px);
    display: flex;
    flex-direction: column;
    gap: var(--gap-body);
  }

  /* ── Field label ── */
  .field-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 8px;
  }

  /* ── Input group ── */
  .input-group {
    display: flex;
    gap: 8px;
    align-items: stretch;
    flex-wrap: wrap;
  }

  .input-wrap {
    flex: 1 1 120px;
    position: relative;
    min-width: 0;
  }

  .input-wrap input[type=number] {
    width: 100%;
    padding: 12px 52px 12px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: max(1rem, 16px);
    font-weight: 600;
    color: var(--text);
    background: var(--bg);
    outline: none;
    transition: border-color 0.18s, box-shadow 0.18s, background 0.18s;
    appearance: textfield;
    -moz-appearance: textfield;
  }
  .input-wrap input[type=number]::-webkit-inner-spin-button,
  .input-wrap input[type=number]::-webkit-outer-spin-button { -webkit-appearance: none; }
  .input-wrap input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: #fff;
  }

  .input-unit {
    position: absolute;
    right: 13px; top: 50%;
    transform: translateY(-50%);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--muted);
    pointer-events: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  /* ── Buttons ── */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 0 clamp(12px, 3.5vw, 20px);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: clamp(0.82rem, 3vw, 0.88rem);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.18s, transform 0.12s, box-shadow 0.18s, opacity 0.18s;
    white-space: nowrap;
    height: 46px;
    flex-shrink: 0;
    min-width: 44px;
    touch-action: manipulation;
  }
  .btn svg {
    width: 14px; height: 14px;
    fill: none; stroke: currentColor;
    stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round;
    flex-shrink: 0;
  }
  .btn:active:not(:disabled) { transform: scale(0.96); }
  .btn:disabled { opacity: 0.35; cursor: not-allowed; }

  .btn-start {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 10px var(--accent-glow);
  }
  .btn-start:hover:not(:disabled) {
    background: var(--accent-hover);
    box-shadow: 0 4px 18px rgba(232,99,10,0.3);
  }

  .btn-stop {
    background: var(--red-soft);
    color: var(--red);
    border: 1.5px solid rgba(220,38,38,0.18);
  }
  .btn-stop:hover:not(:disabled) {
    background: var(--red);
    color: #fff;
    border-color: var(--red);
  }

  /* ── Progress ── */
  .progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
  }

  .progress-pct {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--green);
    font-variant-numeric: tabular-nums;
    transition: color 0.3s;
  }
  .progress-pct.burning { color: var(--accent); }

  .progress-track {
    height: 7px;
    background: var(--border);
    border-radius: 999px;
    overflow: hidden;
  }

  .progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), #f59e0b);
    border-radius: 999px;
    transition: width 0.4s cubic-bezier(0.4,0,0.2,1);
    position: relative;
    overflow: hidden;
  }
  .progress-fill.done {
    background: linear-gradient(90deg, #16a34a, #4ade80);
  }
  .progress-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 0, rgba(255,255,255,0.45) 50%, transparent 100%);
    background-size: 200% 100%;
    animation: shimmer 1.3s linear infinite;
    opacity: 0;
  }
  .progress-fill.active::after { opacity: 1; }

  @keyframes shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position:  200% 0; }
  }

  /* ── Stats Grid ── */
  .stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(8px, 2.5vw, 10px);
  }

  .stat-card {
    background: var(--bg);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: clamp(10px, 3vw, 14px) clamp(12px, 3.5vw, 16px);
    transition: border-color 0.18s, background 0.18s, transform 0.18s, box-shadow 0.18s;
    min-width: 0;
  }
  .stat-card.highlight {
    border-color: rgba(232,99,10,0.3);
    background: var(--accent-soft);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px var(--accent-glow);
  }
  .stat-card.done-highlight {
    border-color: var(--green-glow);
    background: var(--green-soft);
  }

  .stat-title {
    font-size: clamp(0.6rem, 2vw, 0.67rem);
    font-weight: 600;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .stat-value {
    font-size: clamp(0.85rem, 3.5vw, 1rem);
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
    word-break: break-all;
    font-variant-numeric: tabular-nums;
    transition: color 0.2s;
  }
  .stat-card.highlight .stat-value { color: var(--accent); }
  .stat-card.done-highlight .stat-value { color: var(--green); }

  /* ── Status Row ── */
  .status-row {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    background: var(--bg);
    border: 1.5px solid var(--border);
    transition: background 0.25s, border-color 0.25s;
  }
  .status-row.running {
    background: var(--accent-soft);
    border-color: rgba(232,99,10,0.25);
  }
  .status-row.done {
    background: var(--green-soft);
    border-color: rgba(22,163,74,0.25);
  }
  .status-row.error {
    background: var(--red-soft);
    border-color: rgba(220,38,38,0.22);
  }

  .status-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--muted);
    flex-shrink: 0;
    transition: background 0.25s;
  }
  .status-row.running .status-dot {
    background: var(--accent);
    animation: dotPulse 1.1s ease-in-out infinite;
  }
  .status-row.done  .status-dot { background: var(--green); }
  .status-row.error .status-dot { background: var(--red); }

  @keyframes dotPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.4; transform: scale(1.6); }
  }

  .status-text {
    font-size: clamp(0.71rem, 2.5vw, 0.78rem);
    font-weight: 500;
    color: var(--text);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color 0.25s;
  }
  .status-row.running .status-text { color: var(--accent); }
  .status-row.done    .status-text { color: var(--green); }
  .status-row.error   .status-text { color: var(--red); }

  /* ── Footer link row ── */
  .card-footer {
    padding: 14px var(--card-px) 18px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
  }

  .footer-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--muted);
    text-decoration: none;
    letter-spacing: 0.01em;
    transition: color 0.18s;
  }
  .footer-link:hover { color: var(--accent); }
  .footer-link svg {
    width: 13px; height: 13px;
    flex-shrink: 0;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
  }
  .footer-sep {
    width: 3px; height: 3px;
    background: var(--border-dark);
    border-radius: 50%;
  }

  /* ── Burn flame animation (overlay on card while running) ── */
  .flame-ring {
    position: absolute;
    inset: -1px;
    border-radius: var(--radius);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s;
    background: transparent;
    box-shadow: 0 0 0 0 var(--accent-glow);
    z-index: 2;
  }
  .card.burning .flame-ring {
    opacity: 1;
    animation: flamePulse 2s ease-in-out infinite;
  }
  @keyframes flamePulse {
    0%, 100% { box-shadow: 0 0 0  2px var(--accent-glow), 0 0 0  6px transparent; }
    50%       { box-shadow: 0 0 0  4px var(--accent-glow), 0 0 24px rgba(232,99,10,0.09); }
  }

  /* ── Responsive ── */
  @media (min-width: 540px) {
    .card { border-radius: 20px; }
    .stats-grid { gap: 12px; }
  }
  @media (min-width: 640px) {
    body { padding: 40px 24px; }
    .card { max-width: 500px; }
  }
  @media (min-width: 1024px) {
    body { padding: 60px 32px; }
  }
  @media (max-width: 359px) {
    .input-group { flex-direction: column; }
    .input-wrap  { flex: none; width: 100%; }
    .btn-start, .btn-stop { width: 100%; height: 44px; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .stat-value { font-size: 0.82rem; }
  }
  @media (max-width: 479px) {
    .status-text  { font-size: 0.72rem; }
    .brand-badge  { display: none; }
  }
  @media (max-height: 500px) and (orientation: landscape) {
    body { align-items: flex-start; padding-top: 16px; padding-bottom: 16px; }
    .stats-grid { grid-template-columns: repeat(4, 1fr); }
  }
  @media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .card { border-width: 0.5px; }
    .stat-card { border-width: 0.75px; }
    .status-row { border-width: 0.75px; }
  }
  @media (prefers-reduced-motion: reduce) {
    body::before, body::after { animation: none; }
    .progress-fill { transition: width 0.1s; }
    .progress-fill::after { animation: none; opacity: 0 !important; }
    .status-dot { animation: none !important; }
    .card.burning .flame-ring { animation: none; opacity: 0.6; }
    .btn { transition: opacity 0.1s; }
  }