:root {
  --bg: #173526;
  --bg-deep: #10261b;
  --bg-accent: #244a36;
  --surface: rgba(250, 248, 241, 0.94);
  --surface-strong: #fffdf6;
  --surface-muted: rgba(255, 251, 240, 0.82);
  --ink: #172118;
  --muted: #5f685c;
  --line: rgba(23, 33, 24, 0.1);
  --accent: #c9a227;
  --accent-strong: #a88314;
  --accent-soft: #f1e2a6;
  --highlight: #e0b93f;
  --highlight-soft: #f4e4a4;
  --success: #2a6a45;
  --warning: #8a6910;
  --shadow: 0 22px 56px rgba(4, 15, 10, 0.34);
  --shadow-soft: 0 12px 28px rgba(4, 15, 10, 0.14);
  --tab-accent: rgba(255, 253, 246, 0.96);
  --tab-accent-strong: rgba(255, 253, 246, 0.96);
  --tab-accent-text: var(--ink);
  --tab-panel: rgba(255, 253, 246, 0.68);
  --theme-gradient: linear-gradient(180deg, rgba(255, 253, 246, 0.96), rgba(255, 253, 246, 0.96));
}

* {
  box-sizing: border-box;
}

html {
  background: var(--theme-gradient);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  background: var(--theme-gradient);
}

button,
textarea {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  padding: 0;
}

.app-frame {
  width: 100%;
  margin: 0 auto;
  display: grid;
  gap: 0;
}

.roster-section,
.dialog-card {
  background: transparent;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.roster-section {
  min-height: 100vh;
  border-radius: 0;
  padding: max(18px, env(safe-area-inset-top)) 14px max(18px, env(safe-area-inset-bottom)) 18px;
  background: var(--theme-gradient);
  box-shadow: none;
}

.eyebrow,
.dialog-meta {
  color: var(--muted);
}

h2 {
  margin: 0;
}

h2 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-head {
  display: block;
  margin-bottom: 0;
}

.class-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  width: 100%;
  align-items: stretch;
}

.class-tab {
  border: none;
  border-radius: 18px 18px 0 0;
  padding: 10px 14px 12px;
  background: var(--surface-muted);
  color: var(--ink);
  text-align: center;
  box-shadow: none;
  font-size: 0.96rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  transform: translateY(1px);
}

.class-tab.is-active {
  background: transparent;
  color: var(--tab-accent-text);
  position: relative;
  z-index: 2;
  transform: translateY(1px);
  box-shadow: none;
}

.class-tab.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
}

.class-tab:not(.is-active) {
  border-radius: 18px;
  padding: 10px 14px;
  color: var(--button-text, #fff8f1);
  background: var(--button-fill, linear-gradient(180deg, rgba(255, 253, 246, 0.96), rgba(246, 241, 226, 0.86)));
  border: 1px solid rgba(23, 33, 24, 0.14);
  box-shadow: var(--shadow-soft);
  transform: translateY(0);
}

.student-list {
  display: grid;
  gap: 14px;
  margin-top: 0;
  padding: 14px 0 0;
  border-radius: 0 20px 20px 20px;
  background: transparent;
  box-shadow: none;
}

.section-footer {
  display: flex;
  justify-content: center;
  gap: 18px;
  padding: 14px 0 0;
}

.icon-button-nav {
  background: rgba(255, 251, 240, 0.88);
}

.roster-section.theme-a {
  --tab-accent: rgba(192, 57, 43, 0.92);
  --tab-accent-strong: rgba(161, 39, 27, 0.96);
  --tab-accent-text: #fff4ef;
  --theme-gradient: linear-gradient(180deg, rgba(192, 57, 43, 0.92), rgba(161, 39, 27, 0.96));
  --button-a: linear-gradient(180deg, rgba(192, 57, 43, 0.92), rgba(161, 39, 27, 0.96));
  --button-a-text: #fff4ef;
  --button-b: linear-gradient(180deg, rgba(224, 122, 36, 0.92), rgba(196, 96, 16, 0.96));
  --button-b-text: #fff8ef;
  --button-c: linear-gradient(180deg, rgba(235, 198, 58, 0.95), rgba(216, 177, 33, 0.99));
  --button-c-text: #3b2c03;
}

.roster-section.theme-b {
  --tab-accent: rgba(224, 122, 36, 0.92);
  --tab-accent-strong: rgba(196, 96, 16, 0.96);
  --tab-accent-text: #fff8ef;
  --theme-gradient: linear-gradient(180deg, rgba(224, 122, 36, 0.92), rgba(196, 96, 16, 0.96));
  --button-a: linear-gradient(180deg, rgba(192, 57, 43, 0.92), rgba(161, 39, 27, 0.96));
  --button-a-text: #fff4ef;
  --button-b: linear-gradient(180deg, rgba(224, 122, 36, 0.92), rgba(196, 96, 16, 0.96));
  --button-b-text: #fff8ef;
  --button-c: linear-gradient(180deg, rgba(235, 198, 58, 0.95), rgba(216, 177, 33, 0.99));
  --button-c-text: #3b2c03;
}

.roster-section.theme-c {
  --tab-accent: rgba(235, 198, 58, 0.95);
  --tab-accent-strong: rgba(216, 177, 33, 0.99);
  --tab-accent-text: #3b2c03;
  --theme-gradient: linear-gradient(180deg, rgba(235, 198, 58, 0.95), rgba(216, 177, 33, 0.99));
  --button-a: linear-gradient(180deg, rgba(192, 57, 43, 0.92), rgba(161, 39, 27, 0.96));
  --button-a-text: #fff4ef;
  --button-b: linear-gradient(180deg, rgba(224, 122, 36, 0.92), rgba(196, 96, 16, 0.96));
  --button-b-text: #fff8ef;
  --button-c: linear-gradient(180deg, rgba(235, 198, 58, 0.95), rgba(216, 177, 33, 0.99));
  --button-c-text: #3b2c03;
}

.student-card-button {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--ink);
  text-align: left;
  box-shadow: var(--shadow-soft);
}

.student-card-button.is-noted {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(234, 243, 236, 0.78));
}

.student-status {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--highlight);
  box-shadow: inset 0 0 0 2px rgba(224, 185, 63, 0.18);
}

.student-card-button.is-noted .student-status {
  background: var(--success);
  box-shadow: none;
}

.student-copy {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.student-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.student-note-preview {
  color: var(--muted);
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.student-badge {
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(224, 185, 63, 0.24);
  color: var(--warning);
  font-size: 0.8rem;
  font-weight: 700;
}

.student-card-button.is-noted .student-badge {
  background: rgba(47, 110, 67, 0.14);
  color: var(--success);
}

.ghost-button,
.primary-button,
.icon-button {
  border-radius: 999px;
  border: 1px solid var(--line);
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.01em;
  box-shadow: var(--shadow-soft);
}

.primary-button {
  border-color: rgba(168, 131, 20, 0.3);
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  color: #fffdf4;
}

.icon-button {
  width: 42px;
  height: 42px;
  padding: 0;
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
}

.icon-button svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-button-refresh {
  margin-top: 0;
  align-self: start;
}

.note-dialog {
  width: min(100vw - 20px, 760px);
  border: none;
  padding: 0;
  background: transparent;
}

.note-dialog::backdrop {
  background: rgba(31, 35, 41, 0.3);
}

.dialog-card {
  border-radius: 26px;
  padding: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.97), rgba(244, 228, 164, 0.16)),
    var(--surface-strong);
}

.dialog-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}

.dialog-meta {
  margin: 8px 0 0;
}

.note-field {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.note-field textarea {
  width: 100%;
  resize: vertical;
  min-height: 180px;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
}

.dialog-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
}

.empty-state {
  padding: 28px 16px;
  border: 1px dashed var(--line);
  border-radius: 20px;
  text-align: center;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.52);
}

@media (min-width: 780px) {
  .app-frame {
    width: min(100%, 860px);
  }
}