:root {
  --bg: #fbf6ef;
  --surface: #ffffff;
  --text: #2f2a24;
  --text-muted: #6b6055;
  --accent: #c1622d;
  --accent-dark: #9c4c22;
  --accent-soft: #f3ddc9;
  --success: #3f7a4d;
  --success-soft: #e4f1e6;
  --error: #b3261e;
  --error-soft: #fbe9e7;
  --border: #e7dccb;
  --radius: 14px;
  --shadow: 0 4px 18px rgba(60, 40, 20, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a {
  color: var(--accent-dark);
}
a:hover {
  color: var(--accent);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 18px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: 8px;
  white-space: nowrap;
}
.site-nav a:hover {
  background: var(--accent-soft);
  color: var(--accent-dark);
}
.site-nav a.nav-cta {
  background: var(--accent);
  color: #fff;
}
.site-nav a.nav-cta:hover {
  background: var(--accent-dark);
  color: #fff;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.hero {
  text-align: center;
  padding: 48px 16px 32px;
}

.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.hero p.subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 28px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 24px;
  border-radius: 10px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.05s ease;
}
.btn:active {
  transform: scale(0.98);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-dark);
}
.btn-secondary {
  background: var(--surface);
  color: var(--accent-dark);
  border: 1.5px solid var(--accent);
}
.btn-secondary:hover {
  background: var(--accent-soft);
}
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.section {
  margin-top: 48px;
}

.section h2 {
  font-size: 1.4rem;
  margin-bottom: 6px;
}

.section .section-sub {
  color: var(--text-muted);
  margin-top: 0;
  margin-bottom: 20px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.timing-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.timing-table th,
.timing-table td {
  text-align: left;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}

.timing-table th {
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.timing-table tr:last-child td {
  border-bottom: none;
}

.form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  max-width: 640px;
  margin: 0 auto;
}

.form-card h1 {
  margin-top: 0;
  font-size: 1.6rem;
}

.form-card .form-sub {
  color: var(--text-muted);
  margin-top: -6px;
  margin-bottom: 24px;
}

.field {
  margin-bottom: 20px;
}

.field label.field-label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.field .hint {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 4px;
}

input[type="text"],
input[type="tel"],
select {
  width: 100%;
  min-height: 46px;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
  font-family: inherit;
}

input[type="text"]:focus,
input[type="tel"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 10px;
}

.checkbox-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
  font-size: 0.92rem;
  min-height: 44px;
}

.checkbox-pill:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.checkbox-pill input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  flex-shrink: 0;
}

.checkbox-pill.wide {
  grid-column: span 2;
}

.form-actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.form-message {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 0.95rem;
  display: none;
}
.form-message.visible {
  display: block;
}
.form-message.success {
  background: var(--success-soft);
  color: var(--success);
}
.form-message.error {
  background: var(--error-soft);
  color: var(--error);
}

.field-error {
  color: var(--error);
  font-size: 0.85rem;
  margin-top: 6px;
  display: none;
}
.field-error.visible {
  display: block;
}

.empty-note {
  color: var(--text-muted);
  font-size: 0.9rem;
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 12px 14px;
  display: none;
}
.empty-note.visible {
  display: block;
}

footer.site-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 28px 16px 40px;
}

.admin-login {
  max-width: 380px;
  margin: 64px auto;
}

.admin-table-wrap {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.scroll-hint {
  display: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  margin: -8px 0 12px;
}

@media (max-width: 700px) {
  .scroll-hint {
    display: block;
  }
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

table.data-table th,
table.data-table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  white-space: nowrap;
}

table.data-table th {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

table.data-table tr:last-child td {
  border-bottom: none;
}

.tab-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-btn {
  padding: 10px 18px;
  border-radius: 10px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
}

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

.stat-row {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 22px;
  min-width: 140px;
}

.stat .stat-num {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.stat .stat-label {
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  .site-header {
    flex-wrap: nowrap;
    padding: 14px 16px;
  }
  .brand {
    flex-shrink: 0;
  }
  .brand-name {
    font-size: 1rem;
  }
  .site-nav {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    justify-content: flex-end;
    min-width: 0;
    margin: -4px -4px;
    padding: 4px;
  }
  .site-nav::-webkit-scrollbar {
    display: none;
  }
  .nav-link-secondary {
    display: none;
  }
}

@media (max-width: 480px) {
  .form-card {
    padding: 20px;
  }
  #subjects-grid,
  #batch-grid {
    grid-template-columns: 1fr;
  }
  .checkbox-pill.wide {
    grid-column: span 1;
  }
}