:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --ink: #f8fafc;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent-soft: #e3f2ef;
  --border: rgba(59, 130, 246, 0.15);
  --danger: #ef4444;
  --radius: 12px;
  --shadow: 0 8px 28px rgba(28, 37, 36, 0.08);
  font-family: "Segoe UI", "Sarabun", "Noto Sans Thai", system-ui, sans-serif;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

.wrap {
  width: min(920px, 100% - 2rem);
  margin-inline: auto;
}

.site-header {
  background: linear-gradient(135deg, #0a4d42 0%, var(--accent) 55%, #148f7a 100%);
  color: #f4fffc;
  padding: 2rem 0 2.25rem;
  box-shadow: var(--shadow);
}

.site-header h1 {
  margin: 0 0 0.35rem;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 700;
}

.tagline {
  margin: 0;
  opacity: 0.92;
  font-size: 0.95rem;
}

.ad-slot {
  min-height: 90px;
  margin: 1rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.85rem;
}

.main {
  padding: 1.25rem 0 3rem;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.tab {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.tab:hover {
  border-color: var(--accent);
}

.tab.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.panel {
  display: none;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(217, 211, 200, 0.6);
}

.panel.is-active {
  display: block;
}

.panel-title {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
}

.hint {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.hint a {
  color: var(--accent);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem 1rem;
}

.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.form-grid input[type="date"],
.form-grid input[type="time"],
.form-grid input[type="text"],
.form-grid input[type="number"] {
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  background: #fff;
}

.check {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
}

.check input {
  width: auto;
}

.span-2 {
  grid-column: span 2;
}

.diff-time {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.btn {
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font: inherit;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn.primary {
  background: var(--accent);
  color: #fff;
}

.btn.primary:hover {
  filter: brightness(1.05);
}

.btn.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
}

.btn.ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.result {
  margin-top: 1.15rem;
  padding: 1rem 1.1rem;
  border-radius: 10px;
  background: var(--accent-soft);
  border: 1px solid #b8dcd4;
  font-size: 0.95rem;
}

.result.warn {
  background: #fff4e5;
  border-color: #e8c48a;
}

.result dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 1rem;
}

.result dt {
  font-weight: 700;
  color: var(--muted);
}

.result dd {
  margin: 0;
}

.subhead {
  margin: 1.25rem 0 0.5rem;
  font-size: 1rem;
}

.timeline-wrap {
  margin-top: 1rem;
  padding-top: 0.5rem;
}

.timeline-meta {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.progress-track {
  height: 14px;
  border-radius: 999px;
  background: #e0ded8;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #2a9d8f);
  transition: width 0.35s ease;
}

.toast {
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  z-index: 50;
  box-shadow: var(--shadow);
}

.site-footer {
  padding: 1.5rem 0 2rem;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
  .span-2,
  .diff-time {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }
}