/* DLS Class Planner — all styles (extracted from index.html for clarity).
   Visual design copied from the approved mockup (removed 2026-07-10, in
   git history) — do not restyle without Duke's approval; this look was
   signed off before build. */
:root {
  --thai: #f59e0b;
  --thai-bg: #fef3c7;
  --thai-line: #fbbf24;
  --eng: #2563eb;
  --eng-bg: #dbeafe;
  --eng-line: #60a5fa;
  --chi: #dc2626;
  --chi-bg: #fee2e2;
  --chi-line: #f87171;
  --ink: #1e293b;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #f1f5f9;
  --card: #ffffff;
  --warn: #b45309;
  --warn-bg: #fffbeb;
  --ok: #15803d;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-width: 1100px;
}

/* ── Header ── */
header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 20;
}
.logo {
  font-weight: 700;
  font-size: 17px;
}
.logo span {
  color: var(--eng);
}
.term-pick {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 14px;
}
.term-pick select {
  border: none;
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}
.spacer {
  flex: 1;
}
.user-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}
.avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--thai);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.user-chip .role {
  color: var(--muted);
  font-size: 12px;
}
.badge {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
}
.badge.head {
  background: var(--thai-bg);
  color: var(--warn);
}
.signout-btn {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
}

/* ── Tabs ── */
nav {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 0 24px;
  display: flex;
  gap: 4px;
}
nav button {
  border: none;
  background: none;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
}
nav button.active {
  color: var(--ink);
  border-bottom-color: var(--eng);
}
nav button:hover {
  color: var(--ink);
}

main {
  padding: 20px 24px 60px;
}
.view {
  display: none;
}
.view.active {
  display: block;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.chip {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
}
.chip.on {
  color: #fff;
  border-color: transparent;
}
.chip.on.c-thai {
  background: var(--thai);
}
.chip.on.c-eng {
  background: var(--eng);
}
.chip.on.c-chi {
  background: var(--chi);
}
.chip.on.c-all {
  background: var(--ink);
}
.hint {
  font-size: 12.5px;
  color: var(--muted);
  margin-left: auto;
}

/* ── Schedule grid ── */
.gridwrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
}
table.sched {
  border-collapse: collapse;
  width: 100%;
}
table.sched th,
table.sched td {
  border: 1px solid var(--line);
  padding: 6px;
  vertical-align: top;
}
table.sched thead th {
  background: var(--bg);
  font-size: 13px;
  padding: 10px 6px;
  position: sticky;
  top: 0;
}
th.roomcol {
  text-align: left;
  padding-left: 12px;
  width: 150px;
  background: var(--bg);
  font-size: 13px;
  white-space: nowrap;
}
th.roomcol .cap {
  display: block;
  font-weight: 400;
  font-size: 11.5px;
  color: var(--muted);
}
th.roomcol .online {
  color: var(--eng);
  font-size: 11px;
  font-weight: 600;
}
td.slot {
  min-width: 190px;
  height: 58px;
  background: #fafcff;
  cursor: pointer;
}

.class-card {
  border-radius: 8px;
  padding: 6px 9px;
  font-size: 12.5px;
  line-height: 1.45;
  margin-bottom: 4px;
  border-left: 4px solid;
  cursor: pointer;
}
.class-card:hover {
  filter: brightness(0.97);
}
.class-card b {
  font-size: 13px;
}
.class-card .meta {
  color: var(--muted);
  font-size: 11.5px;
  display: flex;
  justify-content: space-between;
  gap: 6px;
}
.lang-thai {
  background: var(--thai-bg);
  border-color: var(--thai);
}
.lang-eng {
  background: var(--eng-bg);
  border-color: var(--eng);
}
.lang-chi {
  background: var(--chi-bg);
  border-color: var(--chi);
}
.wtag {
  display: inline-block;
  background: var(--warn);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  margin-top: 3px;
}
td.clash {
  outline: 2px solid var(--warn);
  outline-offset: -2px;
  background: var(--warn-bg);
}
td.slot.empty:hover {
  outline: 2px dashed var(--eng-line);
  outline-offset: -2px;
}

/* ── Warnings panel ── */
.warnbox {
  background: var(--warn-bg);
  border: 1px solid #fcd34d;
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 16px;
  font-size: 13.5px;
}
.warnbox h3 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--warn);
  margin-bottom: 8px;
}
.warnbox li {
  margin-left: 18px;
  margin-bottom: 4px;
}
.warnbox .note {
  color: var(--muted);
  font-size: 12px;
  margin-top: 8px;
}

/* ── Room availability ── */
.avail td.slot {
  text-align: center;
  vertical-align: middle;
  font-size: 12.5px;
  font-weight: 600;
  height: 44px;
  cursor: default;
}
.free {
  background: #dcfce7 !important;
  color: var(--ok);
}
.busy-thai {
  background: var(--thai-bg) !important;
  color: var(--warn);
}
.busy-eng {
  background: var(--eng-bg) !important;
  color: var(--eng);
}
.busy-chi {
  background: var(--chi-bg) !important;
  color: var(--chi);
}
.legend {
  display: flex;
  gap: 16px;
  font-size: 12.5px;
  color: var(--muted);
  align-items: center;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  display: inline-block;
  margin-right: 5px;
  vertical-align: -1px;
}

/* ── Roster ── */
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}
.panel h2 {
  font-size: 16px;
  margin-bottom: 4px;
}
.panel .sub {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 14px;
}
table.roster {
  border-collapse: collapse;
  width: 100%;
  font-size: 13px;
}
table.roster th,
table.roster td {
  border: 1px solid var(--line);
  padding: 7px 10px;
  text-align: center;
}
table.roster th {
  background: var(--bg);
  font-size: 12px;
}
table.roster td.name {
  text-align: left;
  white-space: nowrap;
}
table.roster tr.total td {
  background: var(--bg);
  font-weight: 700;
}
.flag {
  font-size: 10.5px;
  font-weight: 700;
  color: var(--warn);
  background: var(--warn-bg);
  border: 1px solid #fcd34d;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 6px;
  white-space: nowrap;
}
input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--eng);
  cursor: pointer;
}
input[type="text"].name-input {
  border: 1px solid transparent;
  background: transparent;
  font-size: 13px;
  width: 100%;
  padding: 2px 4px;
}
input[type="text"].name-input:hover,
input[type="text"].name-input:focus {
  border-color: var(--line);
  background: var(--card);
}
select.classpick {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 13.5px;
  background: var(--card);
  min-width: 380px;
}
.small-btn {
  font-size: 12px;
  font-weight: 600;
  color: var(--eng);
  background: var(--eng-bg);
  border: none;
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
}
.danger-btn {
  font-size: 12px;
  font-weight: 600;
  color: var(--chi);
  background: var(--chi-bg);
  border: none;
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
}

/* ── Manage ── */
.manage-group {
  margin-bottom: 30px;
}
.manage-group-title {
  font-size: 16px;
  font-weight: 700;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 6px solid var(--ink);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 12px;
}
.manage-thai .manage-group-title {
  border-left-color: var(--thai);
}
.manage-eng .manage-group-title {
  border-left-color: var(--eng);
}
.manage-chi .manage-group-title {
  border-left-color: var(--chi);
}
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.mcard {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}
.mcard h3 {
  font-size: 14px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.mcard ul {
  list-style: none;
  font-size: 13px;
  max-height: 260px;
  overflow-y: auto;
}
.mcard li {
  padding: 6px 2px;
  border-bottom: 1px solid var(--bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--ink);
  gap: 6px;
}
.mcard li span {
  color: var(--muted);
  font-size: 12px;
}
.addbtn {
  font-size: 12px;
  font-weight: 600;
  color: var(--eng);
  background: var(--eng-bg);
  border: none;
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}
.rmbtn {
  font-size: 11px;
  font-weight: 700;
  color: var(--chi);
  background: none;
  border: none;
  cursor: pointer;
}
.headnote {
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 14px;
}

/* ── Reservation ── */
.pill {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  white-space: nowrap;
}
.pill.lang-thai {
  background: var(--thai-bg);
  color: var(--warn);
}
.pill.lang-eng {
  background: var(--eng-bg);
  color: var(--eng);
}
.pill.lang-chi {
  background: var(--chi-bg);
  color: var(--chi);
}
.pill.st-waiting {
  background: var(--warn-bg);
  color: var(--warn);
  border: 1px solid #fcd34d;
}
.pill.st-assigned {
  background: #dcfce7;
  color: var(--ok);
}

/* ── Change log ── */
table.log {
  border-collapse: collapse;
  width: 100%;
  font-size: 13px;
}
table.log th,
table.log td {
  border-bottom: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
}
table.log th {
  font-size: 12px;
  color: var(--muted);
}

/* ── Login ── */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}
.login-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px 40px;
  width: 380px;
  text-align: center;
}
.login-card .logo {
  font-size: 20px;
  margin-bottom: 6px;
}
.login-card p.tagline {
  color: var(--muted);
  font-size: 13.5px;
  margin-bottom: 24px;
}
.google-btn {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.google-btn:hover {
  background: var(--bg);
}
.divider {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  margin: 18px 0;
}
.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}
.login-card input[type="email"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 10px;
}
.primary-btn {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: none;
  background: var(--eng);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.primary-btn:hover {
  filter: brightness(1.05);
}
.login-msg {
  font-size: 12.5px;
  margin-top: 12px;
  min-height: 16px;
}
.login-msg.ok {
  color: var(--ok);
}
.login-msg.err {
  color: var(--chi);
}
.noaccess-msg {
  font-size: 14px;
  margin-bottom: 18px;
  color: var(--ink);
}

.loading-note {
  padding: 40px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

/* ── Modal (not in the mockup — added for real forms) ── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal-backdrop.open {
  display: flex;
}
.modal-card {
  background: var(--card);
  border-radius: 14px;
  padding: 22px 26px;
  width: 420px;
  max-width: 90vw;
  max-height: 85vh;
  overflow-y: auto;
}
.modal-card h3 {
  font-size: 15px;
  margin-bottom: 14px;
}
.modal-field {
  margin-bottom: 12px;
}
.modal-field label {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 4px;
}
.modal-field select,
.modal-field input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 13.5px;
}
.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 16px;
}
.modal-actions button {
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.modal-actions .cancel {
  background: var(--bg);
  color: var(--muted);
}
.modal-actions .save {
  background: var(--eng);
  color: #fff;
}
.modal-actions .delete {
  background: var(--chi-bg);
  color: var(--chi);
  margin-right: auto;
}
.modal-warn {
  background: var(--warn-bg);
  border: 1px solid #fcd34d;
  color: var(--warn);
  font-size: 12.5px;
  padding: 8px 10px;
  border-radius: 8px;
  margin-bottom: 12px;
}
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--ink);
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
}