:root {
  --navy: #1c3357;
  --navy-dark: #12233d;
  --wine: #6e2145;
  --green: #2f8f52;
  --gray: #6b7280;
  --gray-light: #e5e7eb;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1f2430;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(20, 30, 50, 0.06), 0 1px 8px rgba(20, 30, 50, 0.05);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--gray-light);
}

.header-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.logo {
  flex-shrink: 0;
  display: block;
  height: 46px;
  width: auto;
}

.header-inner h1 {
  margin: 0;
  padding-left: 18px;
  border-left: 1px solid var(--gray-light);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy);
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

.search-section {
  position: relative;
}

.search-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray);
  margin-bottom: 6px;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

#teacher-search {
  width: 100%;
  padding: 13px 42px 13px 16px;
  font-size: 1rem;
  border: 1.5px solid var(--gray-light);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s ease;
}

#teacher-search:focus {
  border-color: var(--navy);
}

.clear-btn {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--gray);
  cursor: pointer;
  padding: 6px 8px;
}

.clear-btn:hover { color: var(--text); }

.teacher-results {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.teacher-results:empty {
  box-shadow: none;
}

.teacher-results li {
  background: var(--surface);
}

.teacher-results li + li {
  border-top: 1px solid var(--gray-light);
}

.teacher-results button {
  width: 100%;
  text-align: left;
  padding: 13px 16px;
  background: none;
  border: none;
  font-size: 0.98rem;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.teacher-results button:hover,
.teacher-results button:focus {
  background: #f0f2f6;
}

.teacher-results .lesson-count {
  font-size: 0.78rem;
  color: var(--gray);
  flex-shrink: 0;
}

.empty-state {
  margin-top: 40px;
  color: var(--gray);
  font-size: 0.95rem;
  text-align: center;
}

.schedule-section {
  margin-top: 8px;
}

.schedule-header {
  margin-bottom: 18px;
}

.back-btn {
  background: none;
  border: none;
  color: var(--navy);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 0;
  margin-bottom: 10px;
}

.back-btn:hover { text-decoration: underline; }

#schedule-teacher-name {
  margin: 0;
  font-size: 1.4rem;
  color: var(--navy);
}

.day-group {
  margin-bottom: 22px;
}

.day-group h3 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--wine);
  margin: 0 0 8px;
  font-weight: 700;
}

.lesson-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.lesson-card + .lesson-card {
  margin-top: 8px;
}

.lesson-time {
  flex-shrink: 0;
  min-width: 58px;
  font-weight: 700;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
}

.lesson-details {
  flex: 1;
  min-width: 0;
}

.lesson-course {
  font-weight: 600;
  color: var(--text);
}

.lesson-room {
  margin-top: 3px;
  font-size: 0.88rem;
  color: var(--gray);
}

.lesson-room::before {
  content: "\2013\ ";
}

.no-room {
  font-size: 0.82rem;
  color: var(--gray);
  font-style: italic;
}

.no-lessons {
  color: var(--gray);
  font-size: 0.95rem;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.site-footer {
  text-align: center;
  padding: 24px 20px 32px;
  color: var(--gray);
  font-size: 0.8rem;
}

@media (max-width: 480px) {
  .header-inner { gap: 12px; }
  .header-inner h1 { font-size: 1rem; padding-left: 12px; }
  .logo { height: 34px; }
  main { padding: 22px 14px 50px; }
}