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

:root {
  --ink: #16181d;
  --ink-soft: #5f646b;
  --paper: #fdf1ec;
  --card: #ffffff;
  --line: #f2ddd3;
  --orange: #e8720c;
  --orange-dark: #c25c00;
  --mint: #7fc9c0;
  --red: #c0392b;
  --radius: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Poppins', sans-serif;
  line-height: 1.6;
}

/* Header with logo */
header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 1.1rem 1.5rem;
}

.header-inner {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex-wrap: wrap;
}

.header-inner img {
  height: 54px;
  width: auto;
}

.header-text h1 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}

.header-text p {
  color: var(--ink-soft);
  margin: 0;
  font-size: 0.9rem;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Teacher tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}

.tab {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.55rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink-soft);
  cursor: pointer;
}

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

.tab.active {
  background: var(--orange);
  border-color: var(--orange);
  color: #fff;
  font-weight: 600;
}

.teacher-section { display: none; }
.teacher-section.active { display: block; }

.teacher-intro { margin-bottom: 1.5rem; }

.teacher-intro h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 0.2rem;
}

.teacher-intro p {
  color: var(--ink-soft);
  margin: 0;
  font-size: 0.95rem;
}

.follow-btn {
  margin-top: 0.8rem;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  background: none;
  border: 1px solid var(--mint);
  color: #3f8b83;
  border-radius: 999px;
  padding: 0.45rem 1.1rem;
  cursor: pointer;
}

.follow-btn.following {
  background: var(--mint);
  border-color: var(--mint);
  color: #10403b;
}

/* Slot cards */
.slot-list {
  display: grid;
  gap: 0.85rem;
}

.slot {
  display: flex;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(196, 116, 60, 0.06);
}

.slot-time {
  flex: 1;
  padding: 1rem 1.25rem;
}

.slot-time .date {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.slot-time .time {
  font-size: 1.15rem;
  font-weight: 600;
}

.slot-action {
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
}

.book-btn, .add-btn {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  background: var(--orange);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.4rem;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(232, 114, 12, 0.25);
}

.book-btn:hover, .add-btn:hover { background: var(--orange-dark); }

.book-btn:disabled {
  background: #e5e0dc;
  color: var(--ink-soft);
  cursor: not-allowed;
  box-shadow: none;
}

.empty-note {
  color: var(--ink-soft);
  padding: 1rem 0;
}

.hint {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin: 0 0 1rem;
}

/* Panels (teacher dashboard, sign-in) */
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 10px rgba(196, 116, 60, 0.06);
}

.panel h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

.field-row {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.field-row label {
  display: flex;
  flex-direction: column;
  font-size: 0.82rem;
  color: var(--ink-soft);
  gap: 0.35rem;
}

input[type="date"], input[type="time"], input[type="email"] {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

input:focus-visible, button:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.status-msg {
  font-size: 0.87rem;
  margin-top: 0.7rem;
}
.status-msg.ok { color: #2e7d5b; }
.status-msg.err { color: var(--red); }

table.bookings {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
table.bookings th, table.bookings td {
  text-align: left;
  padding: 0.6rem 0.5rem;
  border-bottom: 1px solid var(--line);
}
table.bookings th {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-soft);
}

@media (max-width: 520px) {
  .slot { flex-direction: column; align-items: stretch; }
  .slot-action { border-top: 1px solid var(--line); }
  .book-btn { width: 100%; }
}

/* --- Added in v2 --- */

.logout-btn {
  margin-left: auto;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  background: none;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  cursor: pointer;
}
.logout-btn:hover { border-color: var(--orange); color: var(--orange-dark); }

.who-line {
  margin: 0 0 1.25rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.link-btn {
  background: none;
  border: none;
  padding: 0;
  margin-left: 0.4rem;
  font: inherit;
  font-size: 0.88rem;
  color: var(--orange-dark);
  text-decoration: underline;
  cursor: pointer;
}

.ghost-btn {
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  background: none;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  margin-left: 0.4rem;
  cursor: pointer;
}
.ghost-btn:hover { border-color: var(--orange); color: var(--orange-dark); }
.ghost-btn.danger:hover { border-color: var(--red); color: var(--red); }

.pill {
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
}
.pill-open { background: #e8f5ee; color: #2e7d5b; }
.pill-booked { background: #fdecea; color: var(--red); }

.slot-time .meta {
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin-top: 0.15rem;
}

.slot.highlight {
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(232, 114, 12, 0.18);
}

.slot-action { gap: 0.4rem; flex-wrap: wrap; }

select {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

input[type="text"] {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  min-width: 15rem;
}