:root {
  color-scheme: light;
  --bg: #ecf3ff;
  --card: #ffffff;
  --ink: #0f1f3b;
  --muted: #4d607f;
  --primary: #1259e8;
  --primary-2: #0d46bc;
  --line: #cedcf4;
  --mono-bg: #0f1c33;
  --ath-bg: #f6fafe;
  --ath-surface-low: #f0f4f8;
  --ath-surface-lowest: #ffffff;
  --ath-ink: #171c1f;
  --ath-muted: #3e484f;
  --ath-primary: #00668a;
  --ath-primary-soft: #38bdf8;
  --ath-shadow-1: 0 4px 20px rgba(15, 23, 42, 0.04);
  --ath-shadow-2: 0 10px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Manrope", "Segoe UI", Tahoma, sans-serif;
  color: var(--ink);
  background: linear-gradient(160deg, var(--bg), #f8fbff 60%);
}

body.guard-loading {
  visibility: hidden;
}

body.guard-ready {
  visibility: visible;
}

.bg-orb {
  position: fixed;
  z-index: -1;
  width: 38vw;
  height: 38vw;
  max-width: 520px;
  max-height: 520px;
  border-radius: 999px;
  filter: blur(45px);
  opacity: 0.35;
  pointer-events: none;
  animation: float-orb 10s ease-in-out infinite;
}

.orb-a {
  top: -120px;
  left: -110px;
  background: radial-gradient(circle, #58a4ff 0%, transparent 70%);
}

.orb-b {
  top: 120px;
  right: -140px;
  background: radial-gradient(circle, #8fd0ff 0%, transparent 70%);
  animation-delay: -4s;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #d9e6f8;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: linear-gradient(135deg, #76bcff, #1259e8 70%);
  box-shadow: 0 0 0 4px rgba(18, 89, 232, 0.12);
}

.brand-text {
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-weight: 700;
  color: #11274c;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-nav a {
  color: #24416f;
  text-decoration: none;
  font-size: 0.93rem;
  font-weight: 700;
}

.site-nav a:hover {
  color: var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.app {
  max-width: 1220px;
  margin: 28px auto 36px;
  padding: 0 18px;
  display: grid;
  gap: 14px;
}

.landing-shell {
  max-width: 1100px;
}

.auth-shell {
  max-width: 760px;
}

.auth-v2-shell {
  max-width: 1240px;
}

h1,
h2,
h3 {
  margin: 0 0 10px;
}

h1 {
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: clamp(1.7rem, 2.6vw, 2.8rem);
  line-height: 1.1;
}

h2 {
  font-size: 1.12rem;
}

h3 {
  font-size: 1.02rem;
}

.card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  background: linear-gradient(180deg, #ffffff, #fbfdff);
  box-shadow: 0 14px 35px rgba(15, 45, 98, 0.08);
  animation: rise-in 0.45s ease both;
}

.hero {
  padding: 24px;
  background: radial-gradient(circle at 85% 15%, #d5e7ff 0, transparent 45%), linear-gradient(170deg, #ffffff, #eef5ff);
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 8px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #184288;
  background: #dbeaff;
}

.hero-copy {
  max-width: 80ch;
  margin: 0;
  color: #2e466f;
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.institution-grid,
.module-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mini-panel,
.module-card {
  border: 1px solid #d6e3f7;
  border-radius: 14px;
  background: #f6faff;
  padding: 14px;
}

.module-card {
  background: linear-gradient(180deg, #fafdff, #eef5ff);
}

.module-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.module-link:hover {
  box-shadow: 0 12px 22px rgba(32, 82, 158, 0.14);
  transform: translateY(-2px);
}

.mini-panel p,
.module-card p {
  color: var(--muted);
  margin: 0;
}

.section-copy {
  margin: 0 0 12px;
  color: var(--muted);
}

.auth-card {
  max-width: 760px;
  margin: 0 auto;
}

.auth-card.narrow {
  max-width: 560px;
}

.auth-v2-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.94fr) minmax(320px, 1.06fr);
  gap: 14px;
}

.auth-showcase {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 90% 18%, rgba(56, 189, 248, 0.15), transparent 44%),
    linear-gradient(180deg, #ffffff, #f4f8fc);
}

.auth-showcase-title {
  margin: 0 0 8px;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
}

.auth-showcase-copy {
  margin: 0;
  color: #3f5168;
  line-height: 1.65;
}

.auth-points {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 8px;
}

.auth-points li {
  font-family: "Space Grotesk", "Manrope", sans-serif;
  color: #2e587a;
  font-size: 0.88rem;
}

.auth-form-card {
  background: linear-gradient(180deg, #ffffff, #fbfdff);
}

.auth-form-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.auth-form-card #statusBox {
  min-height: 74px;
}

.dashboard-v2 {
  max-width: 1240px;
}

.material-symbols-outlined {
  font-variation-settings: "FILL" 0, "wght" 500, "GRAD" 0, "opsz" 24;
  line-height: 1;
}

.role-dashboard {
  max-width: 1320px;
}

.role-section {
  display: grid;
  gap: 14px;
}

.teacher-dashboard-stack {
  display: grid;
  gap: 14px;
}

.student-dashboard-shell {
  display: grid;
  grid-template-columns: minmax(250px, 290px) minmax(0, 1fr);
  grid-template-areas:
    "rail lesson"
    "rail workspace";
  gap: 14px;
}

.student-course-rail {
  grid-area: rail;
  border: 0;
  border-radius: 26px;
  background:
    radial-gradient(circle at 92% 8%, rgba(56, 189, 248, 0.14), transparent 38%),
    linear-gradient(180deg, #ffffff, #f5f9fd);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.1);
}

.student-course-rail h2 {
  margin: 0 0 8px;
  font-size: 1.28rem;
}

.student-rail-nav {
  display: grid;
  gap: 10px;
}

.student-rail-link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  text-decoration: none;
  border-radius: 14px;
  padding: 10px;
  color: #133762;
  background: #f8fbff;
  transition: transform 0.16s ease, box-shadow 0.16s ease, background-color 0.16s ease;
}

.student-rail-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(0, 102, 138, 0.12);
  background: #f0f7ff;
}

.student-rail-link .material-symbols-outlined {
  margin-top: 2px;
  color: #00668a;
}

.student-rail-link strong {
  display: block;
  font-size: 0.92rem;
  line-height: 1.2;
}

.student-rail-link small {
  display: block;
  margin-top: 3px;
  font-size: 0.78rem;
  line-height: 1.45;
  color: #436286;
}

.student-lesson-stage {
  grid-area: lesson;
  border: 0;
  border-radius: 30px;
  min-height: 320px;
  background:
    radial-gradient(circle at 90% 8%, rgba(56, 189, 248, 0.15), transparent 42%),
    linear-gradient(180deg, #ffffff, #f4f9ff);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.1);
}

.student-lesson-stage h1 {
  margin-bottom: 10px;
}

.student-task-list {
  margin: 0;
  padding-left: 18px;
  color: #364d66;
  line-height: 1.65;
  display: grid;
  gap: 6px;
}

.student-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.student-chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 6px 10px;
  border-radius: 999px;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  color: #0b5e7b;
  background: rgba(56, 189, 248, 0.16);
}

.student-workspace-stage {
  grid-area: workspace;
  border: 0;
  border-radius: 30px;
  background: linear-gradient(180deg, #f0f4f8, #ecf2fa);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.09);
}

.student-workspace-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.student-workspace-head h2 {
  margin: 2px 0 0;
  font-size: 1.32rem;
}

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

.student-quick-card {
  display: grid;
  gap: 7px;
  min-height: 168px;
  border-radius: 18px;
  padding: 14px;
  text-decoration: none;
  color: #172535;
  background: #ffffff;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.08);
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.student-quick-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 26px rgba(0, 102, 138, 0.14);
}

.student-quick-tag {
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  padding: 4px 8px;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.035em;
  color: #075b79;
  text-transform: uppercase;
  background: rgba(56, 189, 248, 0.18);
}

.student-quick-card h3 {
  margin: 0;
  font-size: 1.02rem;
}

.student-quick-card p {
  margin: 0;
  color: #44566a;
  line-height: 1.5;
}

.student-quick-action {
  margin-top: auto;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  color: #00668a;
}

.dashboard-hero-card {
  background:
    radial-gradient(circle at 86% 10%, rgba(56, 189, 248, 0.14), transparent 45%),
    linear-gradient(180deg, #ffffff, #f4f9ff);
}

.dashboard-hero-note {
  margin: 0;
  max-width: 74ch;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  color: #355578;
  font-size: 0.9rem;
}

.dashboard-modules-card {
  background: linear-gradient(180deg, #f6fafe, #eef4fb);
}

.module-hub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.module-hub-card {
  position: relative;
  border-radius: 18px;
  padding: 16px;
  min-height: 180px;
  display: grid;
  align-content: start;
  gap: 8px;
  text-decoration: none;
  color: inherit;
  border: 1px solid rgba(189, 200, 209, 0.2);
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.08);
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.module-hub-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(0, 102, 138, 0.14);
  border-color: rgba(0, 102, 138, 0.28);
}

.module-hub-kicker {
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  padding: 5px 9px;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.035em;
  text-transform: uppercase;
  color: #085b79;
  background: rgba(56, 189, 248, 0.16);
}

.module-hub-card h3 {
  margin: 0;
  font-size: 1.12rem;
}

.module-hub-card p {
  margin: 0;
  color: #40566f;
  line-height: 1.55;
}

.module-hub-action {
  margin-top: auto;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.84rem;
  font-weight: 700;
  color: #00668a;
}

.module-hub-live {
  background: linear-gradient(170deg, #ffffff, #eef8ff);
}

.module-hub-exercises {
  background: linear-gradient(170deg, #ffffff, #f4f9ff);
}

.module-hub-lessons {
  background: linear-gradient(170deg, #ffffff, #f8fcff);
}

.module-hub-guide {
  background: linear-gradient(170deg, #ffffff, #f5fbff);
}

.module-hub-admin {
  background: linear-gradient(170deg, #ffffff, #f5f8fc);
}

.console-shell {
  display: grid;
  grid-template-columns: minmax(300px, 370px) minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.console-col {
  display: grid;
  gap: 14px;
}

.console-left .grid {
  grid-template-columns: 1fr;
}

.console-right .grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.live-shell .console-left {
  grid-template-columns: 1fr;
}

.live-shell .console-right {
  grid-template-columns: 1fr;
}

.live-shell .card {
  margin: 0;
}

.live-shell .workbench-card textarea#codeEditor {
  min-height: 430px;
}

.live-shell pre#liveRosterBox,
.live-shell pre#liveQueueBox {
  min-height: 120px;
}

.live-command-page {
  background:
    radial-gradient(circle at 90% 4%, rgba(56, 189, 248, 0.12), transparent 34%),
    radial-gradient(circle at 8% 94%, rgba(0, 102, 138, 0.1), transparent 40%),
    #f3f8fd;
}

.live-command-topbar {
  gap: 10px;
  flex-wrap: wrap;
  justify-content: space-between;
}

.live-command-search {
  display: inline-grid;
  grid-template-columns: 20px minmax(180px, 260px);
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 5px 12px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(189, 200, 209, 0.35);
}

.live-command-search .material-symbols-outlined {
  font-size: 1.04rem;
  color: #6d7b8d;
}

.live-command-search input {
  border: 0;
  padding: 4px 0;
  min-height: 0;
  background: transparent;
  font-size: 0.85rem;
}

.live-command-search input:focus {
  outline: none;
  border: 0;
}

.live-command-shell {
  max-width: 1600px;
  margin-top: 18px;
  display: grid;
  grid-template-columns: minmax(320px, 380px) minmax(0, 1fr);
  gap: 14px;
}

.live-command-sidebar {
  display: grid;
  gap: 12px;
  align-content: start;
}

.live-command-card {
  border: 0;
  border-radius: 24px;
  background:
    radial-gradient(circle at 92% 10%, rgba(56, 189, 248, 0.1), transparent 42%),
    linear-gradient(180deg, #ffffff, #f6fafe);
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.08);
}

.live-command-card h2 {
  margin: 0 0 10px;
  font-size: 1.08rem;
}

.live-command-card .actions {
  margin-top: 8px;
}

.live-filter-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.live-command-status pre {
  min-height: 120px;
  margin-top: 8px;
}

.live-command-status #scoresSummaryBox {
  min-height: 62px;
}

.live-command-main {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.95fr);
  gap: 14px;
  align-items: start;
}

.live-editor-card {
  border: 0;
  border-radius: 26px;
  background:
    radial-gradient(circle at 92% 8%, rgba(56, 189, 248, 0.12), transparent 38%),
    linear-gradient(180deg, #ffffff, #f6fafe);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.1);
}

.live-editor-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.live-editor-card textarea#stdinInput {
  min-height: 90px;
}

.live-editor-card textarea#codeEditor {
  min-height: 470px;
}

.live-output-card {
  border: 0;
  border-radius: 26px;
  background: linear-gradient(180deg, #edf4fb, #e7eef8);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.live-output-card #outputBox {
  min-height: 608px;
}

.live-command-focus {
  grid-column: 1 / -1;
  border-radius: 26px;
  border: 0;
  background: linear-gradient(180deg, #f4f8fd, #edf2f9);
}

body.teacher-live-mode .live-command-shell {
  grid-template-columns: minmax(320px, 390px) minmax(0, 1fr);
}

body.teacher-live-mode .live-command-focus #focusStudentGrid {
  max-height: 56vh;
  overflow: auto;
  align-content: start;
}

.live-cc3-page {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 90% 4%, rgba(56, 189, 248, 0.11), transparent 34%),
    radial-gradient(circle at 8% 94%, rgba(0, 102, 138, 0.09), transparent 40%),
    #f6fafe;
}

.live-cc3-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(280px, 320px) minmax(0, 1fr);
}

.live-cc3-sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow: auto;
  padding: 14px;
  background: #f0f4f8;
  border-right: 1px solid rgba(189, 200, 209, 0.24);
  display: grid;
  gap: 12px;
  align-content: start;
}

.live-cc3-brand {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.live-cc3-brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  background: linear-gradient(135deg, #00668a, #38bdf8);
  box-shadow: 0 10px 18px rgba(0, 102, 138, 0.2);
}

.live-cc3-brand h1 {
  margin: 0;
  font-size: 1.02rem;
}

.live-cc3-kicker {
  margin: 2px 0 0;
  font-size: 0.78rem;
  color: #4a5d73;
  line-height: 1.45;
}

.live-cc3-card {
  border-radius: 18px;
  padding: 12px;
  background: #ffffff;
  box-shadow: 0 6px 22px rgba(15, 23, 42, 0.07);
}

.live-cc3-label {
  margin: 0 0 6px;
  font-size: 0.72rem;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #5a6778;
}

.live-cc3-main {
  min-width: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  max-height: 100vh;
}

.live-cc3-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(246, 250, 254, 0.92);
  border-bottom: 1px solid rgba(189, 200, 209, 0.2);
}

.live-cc3-search {
  display: inline-grid;
  grid-template-columns: 20px minmax(220px, 360px);
  gap: 6px;
  align-items: center;
  border-radius: 999px;
  padding: 5px 12px;
  background: #ffffff;
  border: 1px solid rgba(189, 200, 209, 0.45);
}

.live-cc3-search input {
  border: 0;
  min-height: 0;
  background: transparent;
}

.live-cc3-search input:focus {
  outline: none;
  border: 0;
}

.live-cc3-content {
  overflow: auto;
  padding: 14px;
  display: grid;
  gap: 12px;
}

.live-cc3-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 12px;
  align-items: start;
}

.live-cc3-editor {
  border: 0;
  border-radius: 22px;
  background:
    radial-gradient(circle at 92% 9%, rgba(56, 189, 248, 0.12), transparent 38%),
    linear-gradient(180deg, #ffffff, #f6fafe);
}

.live-cc3-editor-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.live-cc3-editor textarea#stdinInput {
  min-height: 88px;
}

.live-cc3-editor textarea#codeEditor {
  min-height: 460px;
  background: #1e2428;
  color: #f2f8ff;
  border: 1px solid #303c53;
}

.live-cc3-side-stack {
  display: grid;
  gap: 12px;
}

.live-cc3-status,
.live-cc3-filters,
.live-cc3-output,
.live-cc3-focus {
  border: 0;
  border-radius: 22px;
  background:
    radial-gradient(circle at 93% 8%, rgba(56, 189, 248, 0.1), transparent 42%),
    linear-gradient(180deg, #ffffff, #f4f8fd);
}

.live-cc3-status pre {
  margin-top: 8px;
}

.live-cc3-output #outputBox {
  min-height: 170px;
}

.live-cc3-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 16px;
  background: #ffffff;
  border-top: 1px solid rgba(189, 200, 209, 0.24);
  font-size: 0.76rem;
  color: #516175;
  font-family: "Space Grotesk", "Manrope", sans-serif;
}

.live-cc3-footer-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.live-cc3-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #16a34a;
}

body.teacher-live-mode main.live-shell.console-shell {
  max-width: 1640px;
  grid-template-columns: 1fr;
}

body.teacher-live-mode .console-left .focus-visual-card {
  order: -20;
  min-height: 74vh;
}

body.teacher-live-mode #focusStudentGrid {
  max-height: 64vh;
  overflow: auto;
  padding-right: 4px;
  align-content: start;
}

body.teacher-live-mode .student-screen-grid {
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

body.teacher-live-mode .student-screen-card {
  min-height: 320px;
}

body.teacher-live-mode .screen-snippet {
  min-height: 122px;
  max-height: 190px;
}

body.teacher-live-mode .screen-pane {
  min-height: 230px;
  max-height: 420px;
}

#scoresSummaryBox {
  min-height: 48px;
}

.focus-visual-card {
  display: grid;
  gap: 12px;
}

.student-screen-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.student-screen-card {
  border: 1px solid #cfe0fb;
  border-radius: 14px;
  background: linear-gradient(180deg, #fafdff, #edf4ff);
  padding: 10px;
  display: grid;
  gap: 8px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.student-screen-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 20px rgba(19, 60, 126, 0.12);
  border-color: #aac8f8;
}

.student-screen-card.is-focused {
  border-color: #1259e8;
  box-shadow: 0 0 0 2px rgba(18, 89, 232, 0.2);
}

.student-screen-card.has-error {
  border-color: #f0a3a3;
  box-shadow: 0 0 0 1px rgba(207, 87, 87, 0.24);
}

.student-screen-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.student-screen-name {
  font-weight: 800;
  color: #113564;
  font-size: 0.9rem;
}

.student-screen-status {
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  border: 1px solid #c6d9f8;
  color: #183e76;
  background: #f5f9ff;
}

.student-screen-meta {
  font-size: 0.75rem;
  color: #34527f;
  line-height: 1.35;
}

.student-screen-meta .is-hand-raised {
  color: #ab4f00;
  font-weight: 800;
}

.screen-snippet {
  margin: 0;
  min-height: 78px;
  max-height: 120px;
  overflow: hidden;
  white-space: pre-wrap;
  word-break: break-word;
  border: 1px solid #1f3962;
  border-radius: 10px;
  background: #0f1c33;
  color: #eaf3ff;
  font-family: "Consolas", "Monaco", monospace;
  font-size: 0.74rem;
  padding: 8px;
}

.student-screen-split {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.screen-snippet.output {
  background: #10172a;
  border-color: #2b406f;
  color: #cbffdf;
}

.screen-snippet.output.has-error {
  color: #ffd4d4;
  border-color: #6f2d2d;
  background: #1d1111;
}

.student-score-row {
  display: grid;
  gap: 6px;
  grid-template-columns: 84px minmax(120px, 1fr) auto auto;
  align-items: center;
}

.student-score-input,
.student-score-note {
  min-height: 30px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid #bfd5f7;
  background: #ffffff;
}

.student-score-meta {
  font-size: 0.74rem;
  color: #3b5783;
  white-space: nowrap;
}

.student-screen-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.student-screen-actions button {
  min-height: 30px;
  padding: 5px 8px;
  font-size: 0.78rem;
}

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

.focus-viewer-panel {
  border: 1px solid #d2e2fb;
  border-radius: 12px;
  background: #f9fcff;
  padding: 10px;
  display: grid;
  gap: 6px;
}

.focus-meta-panel {
  grid-column: 1 / -1;
}

.screen-pane {
  min-height: 170px;
  max-height: 360px;
  overflow: auto;
  margin: 0;
}

.focus-meta-box {
  min-height: 86px;
}

.focus-grid-empty {
  border: 1px dashed #c4d9fa;
  border-radius: 12px;
  padding: 14px;
  color: #35527e;
  background: #f7fbff;
}

.session-badge {
  display: inline-flex;
  align-items: center;
  height: 34px;
  border-radius: 999px;
  border: 1px solid #c8daf7;
  padding: 0 12px;
  color: #1b3d74;
  background: #f6faff;
  font-size: 0.86rem;
  font-weight: 700;
}

.is-hidden {
  display: none !important;
}

.teacher-only.is-hidden {
  display: none !important;
}

label {
  display: grid;
  gap: 4px;
  font-size: 0.9rem;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

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

input,
select,
textarea {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 10px;
  color: #1d3156;
  background: #ffffff;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid #b5d0ff;
  border-color: #9abff8;
}

textarea {
  width: 100%;
  min-height: 260px;
  font-family: "Consolas", "Monaco", monospace;
  resize: vertical;
}

#stdinInput {
  min-height: 96px;
}

button,
.ghost-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  border-radius: 10px;
  padding: 8px 12px;
  font-weight: 700;
}

button {
  border: 0;
  background: linear-gradient(160deg, var(--primary), var(--primary-2));
  color: #fff;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.04);
}

.secondary-btn {
  background: #ffffff;
  color: #183766;
  border: 1px solid #c8daf7;
}

.ghost-link {
  border: 1px solid #c9daf7;
  text-decoration: none;
  color: #15396f;
  background: #f6faff;
}

.ghost-link:hover {
  background: #ecf4ff;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px;
  margin-bottom: 10px;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

pre {
  margin: 0;
  background: var(--mono-bg);
  color: #ecf4ff;
  border-radius: 10px;
  border: 1px solid #1f3962;
  padding: 11px;
  white-space: pre-wrap;
}

#statusBox {
  min-height: 72px;
}

#inviteListBox {
  min-height: 132px;
}

.workbench-card textarea {
  min-height: 360px;
}

#outputBox {
  min-height: 170px;
}

.site-footer {
  max-width: 1220px;
  margin: 0 auto 32px;
  padding: 0 18px;
}

.site-footer p {
  margin: 0;
  color: #40608e;
  font-size: 0.92rem;
}

.landing-topbar {
  background: rgba(246, 250, 254, 0.82);
  border-bottom: 0;
  box-shadow: var(--ath-shadow-2);
}

.landing-v2 {
  background: var(--ath-bg);
  color: var(--ath-ink);
}

.landing-wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

.landing-hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 70px;
  background:
    radial-gradient(circle at 88% 10%, rgba(56, 189, 248, 0.16), transparent 42%),
    radial-gradient(circle at 8% 92%, rgba(0, 102, 138, 0.12), transparent 46%),
    var(--ath-bg);
}

.landing-hero-grid {
  display: grid;
  grid-template-columns: minmax(320px, 1.02fr) minmax(320px, 0.98fr);
  gap: 28px;
  align-items: center;
}

.landing-kicker {
  display: inline-flex;
  margin: 0 0 12px;
  padding: 7px 12px;
  border-radius: 999px;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-transform: uppercase;
  color: var(--ath-primary);
  background: rgba(56, 189, 248, 0.15);
}

.landing-title {
  margin: 0 0 12px;
  font-family: "Manrope", "Segoe UI", sans-serif;
  font-size: clamp(2rem, 4.6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ath-ink);
}

.landing-subtitle {
  margin: 0;
  max-width: 66ch;
  font-size: 1.05rem;
  line-height: 1.68;
  color: var(--ath-muted);
}

.landing-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.landing-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 14px;
  font-family: "Manrope", "Segoe UI", sans-serif;
  font-weight: 800;
  border: 0;
  transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease, background-color 0.18s ease;
}

.landing-btn:hover {
  transform: translateY(-1px);
}

.landing-btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--ath-primary), var(--ath-primary-soft));
  box-shadow: 0 14px 24px rgba(0, 102, 138, 0.18);
}

.landing-btn-secondary {
  color: var(--ath-ink);
  background: #e9eef4;
}

.landing-btn-light {
  color: var(--ath-primary);
  background: #ffffff;
}

.landing-btn-outline {
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.12);
}

.landing-hero-visual {
  position: relative;
}

.lab-mock {
  border-radius: 24px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(18px);
  box-shadow: 0 20px 52px rgba(15, 23, 42, 0.14);
}

.lab-mock-head {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 14px;
  background: #1f2f47;
}

.lab-mock-head .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
}

.lab-mock-tag {
  margin-left: auto;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.82);
}

.lab-mock-body {
  padding: 15px;
  background: #24334e;
  color: #eaf2ff;
}

.lab-line {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 8px;
  align-items: start;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.86rem;
  line-height: 1.45;
  margin-bottom: 4px;
}

.lab-line .n {
  color: rgba(255, 255, 255, 0.35);
}

.lab-output {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.lab-output p {
  margin: 0;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.82rem;
  color: #cde6ff;
  line-height: 1.5;
}

.lab-output-title {
  margin-bottom: 4px !important;
  font-weight: 700;
  color: #7ee2ff !important;
}

.landing-section {
  padding: 72px 0;
}

.landing-section-tonal {
  background: var(--ath-surface-low);
}

.landing-section-title {
  margin: 0 0 18px;
  font-family: "Manrope", "Segoe UI", sans-serif;
  font-size: clamp(1.8rem, 2.8vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--ath-ink);
}

.landing-institutions-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.landing-inst-card {
  padding: 20px;
  border-radius: 22px;
  background: var(--ath-surface-lowest);
  box-shadow: var(--ath-shadow-1);
}

.landing-inst-card.is-featured {
  background: linear-gradient(170deg, #ffffff, #f4f9ff);
  box-shadow: 0 14px 28px rgba(0, 102, 138, 0.13);
}

.landing-inst-card h3 {
  margin: 0 0 6px;
  font-size: 1.2rem;
}

.landing-inst-card p {
  margin: 0;
  color: #44505a;
  line-height: 1.55;
}

.landing-points {
  list-style: none;
  padding: 0;
  margin: 13px 0 0;
  display: grid;
  gap: 7px;
}

.landing-points li {
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.86rem;
  color: #375472;
}

.landing-ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
}

.landing-ecosystem-main {
  grid-column: span 3;
  border-radius: 26px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px);
  box-shadow: var(--ath-shadow-2);
}

.landing-chip {
  display: inline-flex;
  margin-bottom: 10px;
  padding: 6px 11px;
  border-radius: 999px;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ath-primary);
  background: rgba(56, 189, 248, 0.14);
}

.landing-ecosystem-main h3,
.landing-ecosystem-side h3 {
  margin: 0 0 7px;
  font-size: 1.35rem;
}

.landing-ecosystem-main p,
.landing-ecosystem-side p {
  margin: 0;
  color: #455460;
  line-height: 1.6;
}

.landing-ecosystem-side {
  grid-column: span 3;
  border-radius: 22px;
  padding: 20px;
  background: #f8fcff;
  box-shadow: var(--ath-shadow-1);
}

.landing-inline-link {
  display: inline-flex;
  margin-top: 11px;
  color: var(--ath-primary);
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.89rem;
  font-weight: 700;
  text-decoration: none;
}

.landing-inline-link:hover {
  filter: brightness(1.06);
}

.landing-outcomes-copy {
  margin: 0;
  max-width: 72ch;
  color: #465058;
  line-height: 1.65;
}

.landing-metrics {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.landing-metric-card {
  border-radius: 18px;
  padding: 14px;
  background: #ffffff;
  box-shadow: var(--ath-shadow-1);
}

.landing-metric-value {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ath-primary);
}

.landing-metric-label {
  margin: 6px 0 0;
  color: #465058;
  font-size: 0.9rem;
}

.landing-cta {
  padding: 72px 0;
}

.landing-cta-panel {
  position: relative;
  overflow: hidden;
  border-radius: 34px;
  padding: 30px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--ath-primary), var(--ath-primary-soft));
  box-shadow: 0 18px 38px rgba(0, 102, 138, 0.26);
}

.landing-cta-panel h2 {
  margin: 0 0 9px;
  color: #ffffff;
  font-size: clamp(1.75rem, 3.4vw, 3rem);
}

.landing-cta-panel p {
  margin: 0;
  max-width: 70ch;
  opacity: 0.95;
  line-height: 1.6;
}

.landing-footer {
  padding: 24px 0 32px;
  background: #edf3f9;
}

.landing-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.landing-footer-inner p {
  margin: 0;
  color: #44505a;
  font-size: 0.9rem;
}

.landing-footer-links {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.landing-footer-links a {
  color: #44505a;
  text-decoration: none;
  font-family: "Space Grotesk", "Manrope", sans-serif;
  font-size: 0.82rem;
}

.landing-footer-links a:hover {
  color: var(--ath-primary);
}

@keyframes float-orb {
  0% {
    transform: translateY(0) translateX(0);
  }
  50% {
    transform: translateY(22px) translateX(-10px);
  }
  100% {
    transform: translateY(0) translateX(0);
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .site-header {
    flex-wrap: wrap;
    justify-content: center;
  }

  .site-nav {
    order: 3;
    width: 100%;
    justify-content: center;
    padding-bottom: 6px;
  }

  .institution-grid,
  .module-grid {
    grid-template-columns: 1fr;
  }

  .auth-v2-grid {
    grid-template-columns: 1fr;
  }

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

  .module-hub-grid {
    grid-template-columns: 1fr;
  }

  .student-dashboard-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "rail"
      "lesson"
      "workspace";
  }

  .student-workspace-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .student-quick-grid {
    grid-template-columns: 1fr;
  }

  .console-shell {
    grid-template-columns: 1fr;
  }

  .live-cc3-shell {
    grid-template-columns: 1fr;
  }

  .live-cc3-sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid rgba(189, 200, 209, 0.24);
  }

  .live-cc3-topbar {
    flex-wrap: wrap;
  }

  .live-cc3-search {
    width: 100%;
    grid-template-columns: 20px minmax(0, 1fr);
  }

  .live-cc3-grid {
    grid-template-columns: 1fr;
  }

  .live-cc3-editor textarea#codeEditor {
    min-height: 320px;
  }

  .live-command-shell {
    grid-template-columns: 1fr;
  }

  .live-command-main {
    grid-template-columns: 1fr;
  }

  .live-output-card #outputBox {
    min-height: 220px;
  }

  .live-editor-card textarea#codeEditor {
    min-height: 320px;
  }

  .live-filter-grid {
    grid-template-columns: 1fr;
  }

  .landing-hero-grid {
    grid-template-columns: 1fr;
  }

  .landing-institutions-grid {
    grid-template-columns: 1fr;
  }

  .landing-ecosystem-grid {
    grid-template-columns: 1fr;
  }

  .landing-ecosystem-main,
  .landing-ecosystem-side {
    grid-column: auto;
  }

  .landing-metrics {
    grid-template-columns: 1fr;
  }

  .landing-footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .focus-viewer-grid {
    grid-template-columns: 1fr;
  }

  .student-screen-split {
    grid-template-columns: 1fr;
  }

  .student-score-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app {
    margin-top: 16px;
    padding: 0 10px;
    gap: 10px;
  }

  .site-header {
    position: static;
  }

  .header-actions {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .live-cc3-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .live-command-search {
    width: 100%;
    grid-template-columns: 20px minmax(0, 1fr);
  }

  .card {
    padding: 12px;
    border-radius: 14px;
  }

  .landing-wrap {
    padding: 0 12px;
  }

  .landing-hero,
  .landing-section,
  .landing-cta {
    padding: 38px 0;
  }

  .landing-title {
    font-size: clamp(1.7rem, 8vw, 2.5rem);
  }

  .landing-btn {
    width: 100%;
  }

  .landing-cta-panel {
    border-radius: 22px;
    padding: 20px;
  }

  .landing-footer-links {
    flex-wrap: wrap;
  }
}