*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:     #F5F2EE;
  --text:   #2C2A28;
  --accent: #C8B89A;
  --mid:    #E8E4DE;
  --light:  #FAF8F5;
  --dark:   #1E1C1A;
  --muted:  #6A6764;
  --danger: #A94442;
}

body {
  font-family: 'DM Sans', sans-serif;
  font-weight: 300;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── HEADER ── */
.hdr {
  background: var(--dark);
  padding: 0 48px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky; top: 0; z-index: 100;
}
.hdr-logo {
  font-family: 'Cormorant Garamond', serif;
  font-size: 16px; letter-spacing: 0.3em;
  color: var(--bg); text-decoration: none;
}
.hdr-right { display: flex; align-items: center; gap: 20px; }
.hdr-user  { font-size: 12px; letter-spacing: 0.1em; color: rgba(245,242,238,0.45); }
.btn-logout {
  font-size: 11px; letter-spacing: 0.15em;
  color: var(--accent); background: none;
  border: 1px solid rgba(200,184,154,0.5);
  padding: 6px 16px; cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.btn-logout:hover { border-color: var(--accent); color: var(--accent); }

/* ── MAIN ── */
.main { max-width: 1000px; margin: 0 auto; padding: 48px 32px; }
.page-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 26px; font-weight: 300;
  letter-spacing: 0.06em; margin-bottom: 32px;
}

/* ── TOOLBAR ── */
.toolbar { display: flex; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; align-items: center; }
.toolbar input, .toolbar select {
  padding: 10px 14px; font-size: 13px;
  font-family: 'DM Sans', sans-serif; font-weight: 300;
  background: var(--light); border: 1px solid var(--mid);
  color: var(--text); outline: none;
  transition: border-color 0.2s;
}
.toolbar input:focus, .toolbar select:focus { border-color: var(--accent); }
.toolbar input { width: 220px; }

/* ── TABLE ── */
.student-table { width: 100%; border-collapse: collapse; }
.student-table thead tr {
  background: var(--mid);
  font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--muted);
}
.student-table th { padding: 14px 20px; text-align: left; font-weight: 400; }
.student-table tbody tr {
  background: var(--light);
  border-bottom: 1px solid var(--bg);
  cursor: pointer;
  transition: background 0.18s;
}
.student-table tbody tr:hover { background: var(--mid); }
.student-table td { padding: 16px 20px; font-size: 13px; }
.td-name { font-size: 14px; }
.td-meta { color: var(--muted); font-size: 12px; }
.td-time { color: var(--muted); font-size: 11px; letter-spacing: 0.04em; }

/* ── TEACHER PILLS ── */
.teacher-pills { display: flex; flex-wrap: wrap; gap: 6px; }
.teacher-pill {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 14px; cursor: pointer;
  background: var(--bg); border: 1px solid var(--mid);
  font-size: 12px; color: var(--muted); font-family: 'DM Sans', sans-serif;
  transition: all 0.18s; user-select: none;
}
.teacher-pill:hover { border-color: var(--accent); color: var(--text); }
.teacher-pill.selected {
  background: var(--accent); border-color: var(--accent);
  color: var(--dark); font-weight: 400;
}
.teacher-pill-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; flex-shrink: 0; opacity: 0.45;
}
.teacher-pill.selected .teacher-pill-dot { opacity: 1; }
.td-assign { min-width: 160px; }

/* ── TRIAL DATE ── */
.trial-date-wrap { display: flex; align-items: center; gap: 8px; }
.trial-date-input {
  padding: 8px 12px; background: var(--mid); border: 1px solid transparent;
  font-size: 13px; font-family: 'DM Sans', sans-serif; color: var(--text);
  outline: none; transition: border-color 0.2s;
  min-width: 140px;
}
.trial-date-input:focus { border-color: var(--accent); }
.trial-time-select {
  padding: 8px 10px; background: var(--mid); border: 1px solid transparent;
  font-size: 13px; font-family: 'DM Sans', sans-serif; color: var(--text);
  outline: none; transition: border-color 0.2s; cursor: pointer;
  min-width: 70px;
}
.trial-time-select:focus { border-color: var(--accent); }
.trial-time-sep { font-size: 14px; color: var(--muted); }
.btn-save {
  padding: 8px 16px; background: var(--text); color: var(--bg);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  border: none; cursor: pointer; font-family: 'DM Sans', sans-serif;
  transition: opacity 0.2s;
}
.btn-save:hover { opacity: 0.75; }
.save-ok { font-size: 11px; color: var(--accent); display: none; }

/* ── UPCOMING ── */
.upcoming-section {
  border-left: 3px solid var(--accent);
  background: var(--light); padding: 20px 28px; margin-bottom: 24px;
}
.upcoming-title {
  font-size: 10px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 14px;
}
.upcoming-item {
  display: flex; align-items: center; gap: 20px;
  padding: 11px 0; border-bottom: 1px solid var(--mid);
  cursor: pointer; transition: opacity 0.15s;
  text-decoration: none; color: inherit;
}
.upcoming-item:last-child { border-bottom: none; }
.upcoming-item:hover { opacity: 0.7; }
.upcoming-name { font-size: 14px; flex: 1; }
.upcoming-date { font-size: 12px; color: var(--accent); letter-spacing: 0.05em; min-width: 96px; }
.upcoming-venue { font-size: 12px; color: var(--muted); }

/* ── STUDENT 2 SECTION ── */
.section-divider-label {
  font-size: 10px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--accent); padding: 20px 40px 0;
  background: var(--light);
}

.tag-none { font-size: 11px; letter-spacing: 0.12em; color: var(--accent); }

/* ── STATE MSG ── */
.state-msg {
  text-align: center; padding: 64px 0;
  font-size: 13px; color: var(--muted); letter-spacing: 0.1em;
}

/* ── LOGIN ── */
.login-wrap {
  min-height: 100vh; display: flex;
  align-items: center; justify-content: center;
  background: var(--dark);
}
.login-card {
  background: var(--bg);
  padding: 64px 60px; width: 100%; max-width: 420px;
}
.login-logo {
  font-family: 'Cormorant Garamond', serif;
  font-size: 22px; letter-spacing: 0.32em;
  color: var(--text); margin-bottom: 6px;
}
.login-sub {
  font-size: 10px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--muted);
  margin-bottom: 48px;
}
.form-group { margin-bottom: 22px; }
.form-label {
  display: block; font-size: 10px;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 8px;
}
.form-input {
  width: 100%; padding: 13px 16px;
  font-size: 14px; font-family: 'DM Sans', sans-serif; font-weight: 300;
  background: var(--mid); border: 1px solid transparent;
  color: var(--text); outline: none; transition: border-color 0.2s;
}
.form-input:focus { border-color: var(--accent); }
.btn-login {
  width: 100%; padding: 15px; margin-top: 8px;
  background: var(--text); color: var(--bg);
  font-family: 'DM Sans', sans-serif; font-size: 11px;
  letter-spacing: 0.22em; text-transform: uppercase;
  border: none; cursor: pointer; transition: opacity 0.2s;
}
.btn-login:hover:not(:disabled) { opacity: 0.8; }
.btn-login:disabled { opacity: 0.5; cursor: default; }
.btn-login.loading {
  position: relative;
  color: transparent;
}
.btn-login.loading::after {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  width: 16px; height: 16px;
  border: 2px solid rgba(245,242,238,0.3);
  border-top-color: var(--bg);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.login-error {
  margin-top: 16px; font-size: 13px;
  color: var(--danger); text-align: center; min-height: 20px;
}

/* ── STUDENT DETAIL ── */
.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--muted); text-decoration: none;
  margin-bottom: 36px; transition: color 0.2s;
}
.back-link:hover { color: var(--text); }
.student-name-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 34px; font-weight: 300; letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.student-ts {
  font-size: 12px; color: var(--muted);
  letter-spacing: 0.08em; margin-bottom: 40px;
}
.sections { display: flex; flex-direction: column; gap: 2px; }
.section { background: var(--light); padding: 32px 40px; }
.sec-lbl {
  font-size: 10px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 24px;
}
.fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 48px;
}
.field-lbl {
  font-size: 10px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--muted);
  margin-bottom: 5px;
}
.field-val { font-size: 14px; line-height: 1.7; }
.field-empty { font-size: 13px; color: var(--muted); }
.full-col { grid-column: 1 / -1; }

/* ── 手機指派老師（桌機隱藏）── */
.mobile-assign, .mobile-teacher { display: none; }

/* ── RESPONSIVE ── */
@media (max-width: 680px) {
  .hdr { padding: 0 20px; }
  .main { padding: 32px 16px; }
  .fields { grid-template-columns: 1fr; }
  .section { padding: 24px 20px; }
  .student-table th:nth-child(n+4),
  .student-table td:nth-child(n+4) { display: none; }
  .login-card { padding: 44px 28px; }

  .mobile-assign { display: block; margin-top: 6px; }
  .mobile-teacher {
    display: inline-block; margin-top: 5px;
    font-size: 11px; letter-spacing: 0.1em;
    color: var(--accent);
  }
}