:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-strong: #eef1fb;
  --text: #17233d;
  --muted: #5b6480;
  --accent: #3b82f6;
  --accent-strong: #2563eb;
  --success: #16a34a;
  --danger: #dc2626;
  --border: rgba(99, 102, 241, 0.14);
  --shadow: 0 18px 60px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, sans-serif;
  background: linear-gradient(180deg, #eff4ff 0%, #f6f7fb 100%);
  color: var(--text);
}

.app-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}

.hero {
  align-items: center;
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(0, 1fr) auto;
  padding: 32px;
  background: linear-gradient(135deg, #ffffff 0%, #eef4ff 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 28px;
  margin-bottom: 24px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-strong);
  font-size: 0.8rem;
  margin: 0 0 8px;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.05;
}

.subtitle {
  margin: 14px 0 0;
  color: var(--muted);
  max-width: 720px;
}

.brand-mark {
  color: var(--accent-strong);
  font-size: 1.08rem;
  font-weight: 700;
}

.hero-meta {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(59, 130, 246, 0.14);
  border-radius: 18px;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.08);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 210px;
  padding: 14px;
  position: relative;
}

.hero-meta-heading {
  align-items: center;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.hero-meta-heading span {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.source-button {
  background: var(--accent-strong);
  border: 1px solid var(--accent-strong);
  border-radius: 12px;
  color: white;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 10px 14px;
  text-align: left;
}

.source-button::after {
  content: "↓";
  float: right;
}

.source-button[aria-expanded="true"]::after {
  content: "↑";
}

.source-panel {
  background: white;
  border: 1px solid rgba(59, 130, 246, 0.18);
  border-radius: 14px;
  color: var(--muted);
  display: grid;
  font-size: 0.82rem;
  gap: 4px;
  min-width: 290px;
  padding: 13px 14px;
  position: absolute;
  right: 0;
  text-align: left;
  top: calc(100% + 10px);
  z-index: 2;
}

.source-panel strong {
  color: var(--text);
}

.source-links {
  display: grid;
  gap: 6px;
  margin-top: 7px;
}

.source-links a {
  color: var(--accent-strong);
  font-weight: 700;
  text-decoration: none;
}

.source-links a:hover {
  text-decoration: underline;
}

@media (max-width: 720px) {
  .hero {
    align-items: stretch;
    grid-template-columns: 1fr;
  }

  .hero-meta {
    min-width: 0;
  }

  .source-panel {
    left: 0;
    min-width: 0;
    right: 0;
  }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 26px;
  margin-bottom: 24px;
  box-shadow: 0 10px 35px rgba(15, 23, 42, 0.05);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
}

.hidden {
  display: none !important;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.form-group {
  display: grid;
  gap: 10px;
}

label {
  color: var(--muted);
  font-size: 0.95rem;
}

input,
select {
  width: 100%;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: #f8fbff;
  color: var(--text);
  font-size: 1rem;
}

select {
  cursor: pointer;
}

.intro,
.muted,
.empty-state {
  color: var(--muted);
}

.step-label,
.category-kicker {
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.class-grid {
  grid-template-columns: minmax(180px, 0.6fr) minmax(240px, 1.4fr);
  margin-bottom: 18px;
}

.student-grid {
  grid-template-columns: minmax(260px, 1.3fr) minmax(240px, 0.7fr);
  margin-bottom: 18px;
}

.class-info {
  align-items: center;
  background: #f8fbff;
  border: 1px solid rgba(59, 130, 246, 0.14);
  border-radius: 18px;
  display: flex;
  justify-content: space-between;
  margin-top: 18px;
  padding: 14px 18px;
}

.class-info strong {
  display: block;
  margin-top: 4px;
}

.compact-btn {
  padding: 11px 15px;
}

.panel-actions {
  display: flex;
  gap: 10px;
}

.event-groups {
  display: grid;
  gap: 18px;
  margin: 20px 0;
}

.event-group {
  background: #f8fbff;
  border: 1px solid rgba(59, 130, 246, 0.14);
  border-radius: 20px;
  margin: 0;
  padding: 18px;
}

.optional-group {
  background: #eef6ff;
}

.event-heading {
  align-items: end;
  display: flex;
  gap: 18px;
  justify-content: space-between;
  margin-bottom: 16px;
}

.event-heading h3 {
  margin: 4px 0 0;
}

.discipline-prompt {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 10px;
}

.discipline-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.discipline-button {
  background: #fee2e2;
  border: 1px solid #f87171;
  border-radius: 14px;
  color: #991b1b;
  cursor: pointer;
  font-weight: 700;
  padding: 12px 16px;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.discipline-button:hover {
  transform: translateY(-1px);
}

.discipline-button.selected {
  background: #dcfce7;
  border-color: #4ade80;
  color: #166534;
}

.selection-hint {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 4px 0 0;
}

.summary-card {
  align-items: center;
  background: #eff6ff;
  border: 1px solid rgba(59, 130, 246, 0.18);
  border-radius: 20px;
  display: flex;
  justify-content: space-between;
  padding: 18px;
}

.summary-note {
  color: var(--accent-strong);
  display: block;
  font-size: 2rem;
  margin-top: 4px;
}

.add-student-btn {
  margin-top: 18px;
  width: 100%;
}

.gender-group {
  margin-top: 6px;
}

.gender-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.gender-button,
.primary-btn,
.secondary-btn,
.event-option,
#addStudent,
#printList {
  border: none;
  cursor: pointer;
  border-radius: 18px;
  padding: 16px 20px;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.gender-button,
.event-option,
.secondary-btn {
  background: #f4f6ff;
  color: var(--text);
}

.gender-button.active,
.event-option.selected,
.primary-btn {
  background: var(--accent);
  color: #fff;
}

.gender-button:hover,
.event-option:hover,
.primary-btn:hover,
.secondary-btn:hover {
  transform: translateY(-1px);
}

.primary-btn {
  background: var(--accent-strong);
  color: #fff;
}

.secondary-btn {
  background: #eef4ff;
  color: var(--accent-strong);
  border: 1px solid rgba(59, 130, 246, 0.18);
}

.optional-btn {
  background: #e0efff;
  color: #1d4ed8;
}

.table-toggle {
  margin-top: 20px;
}

.event-descriptor {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 20px 0;
}

.descriptor-box {
  background: #f8fbff;
  border: 1px solid rgba(59, 130, 246, 0.12);
  border-radius: 18px;
  padding: 18px;
  color: var(--text);
}

.descriptor-box strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1rem;
}

.descriptor-box.optional {
  background: #eef4ff;
  border-color: rgba(59, 130, 246, 0.24);
}

.event-group {
  margin-bottom: 24px;
}

.event-group h3 {
  margin: 0 0 16px;
  font-size: 1.1rem;
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
}

.event-option {
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: #f8fbff;
  color: var(--text);
  min-height: 84px;
  padding: 16px;
  display: grid;
  align-items: center;
  justify-items: stretch;
  gap: 8px;
  text-align: left;
}

.event-option strong {
  font-size: 1rem;
}

.event-option span {
  color: var(--muted);
  font-size: 0.95rem;
}

.event-option.selected {
  background: rgba(59, 130, 246, 0.14);
  border-color: var(--accent);
}

.summary-card {
  border-top: 1px solid rgba(15, 23, 42, 0.08);
  padding-top: 20px;
  margin-top: 22px;
}

.summary-card p {
  margin: 12px 0;
}

#qrCode {
  background: white;
  border-radius: 12px;
  margin-top: 8px;
  min-height: 160px;
  min-width: 160px;
  padding: 4px;
}

.qr-export {
  align-items: center;
  display: flex;
  flex-direction: column;
  text-align: center;
}

.table-panel {
  background: #f8fbff;
  border: 1px solid rgba(59, 130, 246, 0.14);
  border-radius: 20px;
  padding: 20px;
  margin-top: 18px;
}

.table-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.table-panel table {
  width: 100%;
  border-collapse: collapse;
}

.table-panel th,
.table-panel td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(15, 23, 42, 0.05);
}

.table-panel th {
  color: var(--accent-strong);
  font-size: 0.95rem;
}

.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 860px;
}

thead th {
  text-align: left;
  padding: 14px 16px;
  color: var(--accent-strong);
  font-size: 0.95rem;
  background: #f8fbff;
}

tbody tr {
  border-top: 1px solid rgba(15, 23, 42, 0.08);
}

td {
  padding: 14px 16px;
}

tbody tr:nth-child(even) {
  background: #fcfdff;
}

@media (max-width: 900px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
  .event-heading,
  .summary-card {
    align-items: stretch;
    flex-direction: column;
  }
}

@media print {
  body {
    background: white;
    color: #000;
  }
  .app-shell {
    padding: 0;
  }
  .hero, .panel, .primary-btn, .secondary-btn, .event-option, .gender-button {
    box-shadow: none;
    border: none;
    background: transparent;
  }
  .hero, #onboardingPanel, #studentPanel, #eventPanel, #emptyList {
    display: none !important;
  }
  #studentListPanel {
    margin: 0;
    padding: 0;
  }
  .secondary-btn, .primary-btn, #addStudent, #toggleEndurance {
    display: none;
  }
  table {
    width: 100%;
  }
}

/* Product-style visual system inspired by clear, trustworthy service interfaces. */
:root {
  --bg: #eef4f7;
  --surface: #ffffff;
  --surface-strong: #f4f8fa;
  --text: #102d42;
  --muted: #597080;
  --accent: #176b80;
  --accent-strong: #12344d;
  --success: #167266;
  --danger: #b45d66;
  --border: rgba(16, 45, 66, 0.14);
  --shadow: 0 14px 36px rgba(16, 45, 66, 0.09);
}

body {
  background: linear-gradient(180deg, #e8f3f5 0%, #f4f7f8 58%, #edf2f5 100%);
  font-family: Inter, Arial, Helvetica, sans-serif;
}

.app-shell {
  max-width: 1180px;
  padding-top: 22px;
}

.hero {
  background: #102d42;
  border: 0;
  border-radius: 18px;
  box-shadow: var(--shadow);
  color: white;
  overflow: visible;
  padding: 32px 36px;
  position: relative;
}

.hero::before {
  background: #76439a;
  content: "";
  height: 5px;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
}

.eyebrow,
.step-label,
.category-kicker {
  color: #176b80;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.hero .eyebrow {
  color: #8dd9de;
}

h1 {
  font-size: clamp(2.35rem, 5vw, 4rem);
  letter-spacing: -0.055em;
}

h2,
h3 {
  letter-spacing: -0.035em;
}

.subtitle {
  color: #d4e3ea;
  line-height: 1.55;
}

.hero-meta {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  box-shadow: none;
  min-width: 238px;
  padding: 15px;
}

.hero-meta-heading span {
  color: #b8d0db;
}

.brand-mark {
  color: white;
  letter-spacing: 0.02em;
}

.source-button,
.primary-btn {
  background: #bde5e4;
  border: 1px solid #bde5e4;
  border-radius: 8px;
  color: #102d42;
  font-weight: 800;
}

.source-button:hover,
.primary-btn:hover {
  background: #d4f0ef;
}

.source-panel {
  background: white;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  color: var(--muted);
}

.source-panel strong {
  color: var(--text);
}

.source-links a {
  color: #176b80;
}

.panel {
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

input,
select {
  background: white;
  border: 1px solid rgba(16, 45, 66, 0.22);
  border-radius: 8px;
}

.class-info,
.event-group,
.summary-card,
.table-panel {
  background: #f4f8fa;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.secondary-btn,
.gender-button,
.event-option {
  background: white;
  border: 1px solid rgba(16, 45, 66, 0.2);
  border-radius: 8px;
  color: var(--text);
}

.secondary-btn:hover,
.gender-button:hover,
.event-option:hover {
  background: #edf7f7;
  border-color: #79c6c8;
}

.gender-button.active,
.event-option.selected {
  background: #176b80;
  border-color: #176b80;
  color: white;
}

.event-option.selected span {
  color: #d9f3f2;
}

.discipline-button {
  background: #fff5f5;
  border: 1px solid #d49aa0;
  border-radius: 8px;
  color: #8e454e;
}

.discipline-button.selected {
  background: #167266;
  border-color: #167266;
  color: white;
}

.optional-btn {
  background: #102d42;
  border-color: #102d42;
  color: white;
}

thead th {
  background: #102d42;
  color: white;
  letter-spacing: 0.03em;
}

tbody tr:nth-child(even) {
  background: #f7fafb;
}

#qrCode {
  border-radius: 8px;
}