:root {
  --navy: #102a43;
  --blue: #1769aa;
  --blue-dark: #0d4f87;
  --sky: #eaf5ff;
  --gold: #f2b84b;
  --text: #203040;
  --muted: #647589;
  --line: #dbe5ee;
  --surface: #ffffff;
  --background: #f4f8fb;
  --danger: #b42318;
  --success: #137a4a;
  --shadow: 0 18px 50px rgba(28, 55, 80, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--background);
  font-family:
    "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  line-height: 1.6;
}

button,
input,
select,
textarea {
  font: inherit;
}

.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 80% 20%, rgba(95, 189, 255, 0.3), transparent 30%),
    linear-gradient(125deg, #0a3157, #1269a8 65%, #218ac8);
}

.hero::after {
  position: absolute;
  right: -100px;
  bottom: -160px;
  width: 430px;
  height: 430px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  box-shadow:
    0 0 0 42px rgba(255, 255, 255, 0.04),
    0 0 0 84px rgba(255, 255, 255, 0.03);
  content: "";
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1100px, calc(100% - 40px));
  margin: 0 auto;
  padding: 70px 0 76px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 8px;
  color: var(--gold);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 3.8rem);
  line-height: 1.2;
}

.hero-copy {
  max-width: 660px;
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.06rem;
}

.page {
  width: min(1100px, calc(100% - 32px));
  margin: -34px auto 70px;
  position: relative;
  z-index: 2;
}

.card,
.day-card {
  border: 1px solid rgba(205, 220, 232, 0.9);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.intro-card {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding: 26px 30px;
}

.section-kicker {
  color: var(--blue);
}

h2,
h3,
p {
  margin-top: 0;
}

h2 {
  margin-bottom: 0;
  color: var(--navy);
  font-size: clamp(1.35rem, 3vw, 1.8rem);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--muted);
  font-size: 0.88rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.dot.available {
  background: #38a169;
}

.dot.limited {
  background: #e29a1f;
}

.dot.full {
  background: #a0aec0;
}

.schedule {
  display: grid;
  gap: 22px;
  margin: 22px 0;
}

.loading-card {
  padding: 60px 20px;
  border-radius: 18px;
  color: var(--muted);
  background: white;
  text-align: center;
}

.day-card {
  overflow: hidden;
}

.day-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 26px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #f8fcff, #eef7ff);
}

.day-header h3 {
  margin-bottom: 2px;
  color: var(--navy);
  font-size: 1.2rem;
}

.location {
  color: var(--muted);
  font-size: 0.9rem;
}

.teacher-list {
  display: grid;
  gap: 0;
}

.teacher {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(360px, 1.8fr);
  gap: 28px;
  padding: 24px 26px;
  border-bottom: 1px solid var(--line);
}

.teacher:last-child {
  border-bottom: 0;
}

.teacher-name {
  margin: 0 0 5px;
  color: var(--navy);
  font-size: 1.15rem;
}

.teacher-title,
.teacher-fields {
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.9rem;
}

.teacher-fields {
  color: #39546c;
}

.time-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  align-content: center;
}

.slot {
  position: relative;
}

.slot input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.slot-label {
  display: block;
  min-height: 70px;
  padding: 11px 8px;
  border: 1px solid #cfdde8;
  border-radius: 11px;
  background: #fff;
  text-align: center;
  cursor: pointer;
  transition: 0.18s ease;
}

.slot-label strong {
  display: block;
  color: var(--navy);
  font-size: 0.92rem;
}

.slot-label small {
  display: block;
  margin-top: 3px;
  color: var(--success);
}

.slot input:focus-visible + .slot-label {
  outline: 3px solid rgba(23, 105, 170, 0.22);
  outline-offset: 2px;
}

.slot input:checked + .slot-label {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--sky);
  box-shadow: inset 0 0 0 1px var(--blue);
}

.slot input:disabled + .slot-label {
  color: #8b98a6;
  background: #f1f4f6;
  cursor: not-allowed;
}

.slot input:disabled + .slot-label strong,
.slot input:disabled + .slot-label small {
  color: #8b98a6;
}

.slot.limited .slot-label {
  border-color: #e6b45d;
  background: #fffaf0;
}

.form-card {
  padding: 30px;
}

.form-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.required-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

label > span {
  display: block;
  margin-bottom: 7px;
  color: #334e68;
  font-size: 0.92rem;
  font-weight: 650;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #cbd8e3;
  border-radius: 10px;
  color: var(--text);
  background: #fff;
  outline: none;
  transition: 0.16s ease;
}

input,
select {
  height: 46px;
  padding: 0 13px;
}

textarea {
  padding: 11px 13px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(23, 105, 170, 0.12);
}

.full-width {
  grid-column: 1 / -1;
}

.privacy-check {
  display: flex;
  align-items: start;
  gap: 10px;
  margin: 22px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.privacy-check input {
  width: 18px;
  height: 18px;
  margin-top: 3px;
}

.privacy-check span {
  margin: 0;
  font-weight: 400;
}

.selected-summary,
.message {
  margin: 18px 0;
  padding: 13px 15px;
  border-radius: 10px;
}

.selected-summary {
  border: 1px solid #bfdbf0;
  color: #174d76;
  background: #edf7ff;
}

.message.error {
  border: 1px solid #f1c2bd;
  color: var(--danger);
  background: #fff2f0;
}

.primary-button {
  width: 100%;
  min-height: 50px;
  padding: 12px 20px;
  border: 0;
  border-radius: 11px;
  color: white;
  background: linear-gradient(100deg, var(--blue-dark), var(--blue));
  box-shadow: 0 9px 20px rgba(23, 105, 170, 0.2);
  cursor: pointer;
  font-weight: 700;
}

.primary-button:hover {
  filter: brightness(1.06);
}

.primary-button:disabled {
  opacity: 0.62;
  cursor: wait;
}

.dialog-backdrop {
  position: fixed;
  z-index: 10;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(8, 31, 50, 0.68);
}

.dialog-backdrop[hidden] {
  display: none;
}

.success-dialog {
  width: min(440px, 100%);
  padding: 34px;
  border-radius: 20px;
  background: white;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.25);
  text-align: center;
}

.success-icon {
  display: grid;
  width: 62px;
  height: 62px;
  margin: 0 auto 18px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--success);
  font-size: 1.8rem;
  font-weight: 800;
}

.success-dialog p {
  margin: 12px 0 24px;
  color: var(--muted);
}

footer {
  padding: 24px;
  color: var(--muted);
  text-align: center;
  font-size: 0.85rem;
}

@media (max-width: 780px) {
  .hero-inner {
    padding: 54px 0 64px;
  }

  .intro-card,
  .day-header,
  .form-heading {
    align-items: start;
    flex-direction: column;
  }

  .teacher {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .full-width {
    grid-column: auto;
  }
}

@media (max-width: 520px) {
  .page {
    width: min(100% - 20px, 1100px);
  }

  .intro-card,
  .form-card {
    padding: 22px 18px;
  }

  .day-header,
  .teacher {
    padding: 20px 17px;
  }

  .time-options {
    grid-template-columns: 1fr;
  }
}

.intro-actions {
  display: flex;
  align-items: flex-end;
  flex-direction: column;
  gap: 14px;
}

.outline-button {
  min-height: 42px;
  padding: 9px 16px;
  border: 1px solid var(--blue);
  border-radius: 10px;
  color: var(--blue);
  background: white;
  cursor: pointer;
  font-weight: 700;
}

.edit-dialog {
  text-align: left;
}

.edit-dialog > p {
  color: var(--muted);
}

.edit-dialog label {
  display: block;
  margin-top: 14px;
}

.dialog-actions {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 12px;
  margin-top: 22px;
}

.edit-code-panel {
  margin: 18px 0 24px;
  padding: 15px;
  border: 1px dashed var(--blue);
  border-radius: 10px;
  color: var(--navy);
  background: var(--sky);
}

.edit-code-panel strong {
  display: block;
  margin: 4px 0;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 1.45rem;
  letter-spacing: 0.12em;
}

@media (max-width: 780px) {
  .intro-actions {
    align-items: flex-start;
  }
}