:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-soft: #0d1a2d;
  --panel: rgba(12, 23, 40, 0.82);
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #eff4ff;
  --muted: #aebad0;
  --accent: #68e1fd;
  --accent-2: #8e7dff;
  --success: #39d98a;
  --warning: #ffb84d;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(104, 225, 253, 0.18), transparent 30%),
    radial-gradient(circle at top right, rgba(142, 125, 255, 0.18), transparent 26%),
    linear-gradient(180deg, #06101d 0%, #091525 45%, #07111f 100%);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.8), transparent 92%);
}

a {
  color: inherit;
  text-decoration: none;
}

.page-shell {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.9fr);
  gap: 24px;
  align-items: stretch;
  margin-top: 12px;
}

.hero-copy,
.hero-panel,
.info-card,
.data-section,
.run-section {
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.hero-copy {
  border-radius: calc(var(--radius) + 8px);
  padding: 44px;
  position: relative;
  overflow: hidden;
}

.hero-copy::after {
  content: '';
  position: absolute;
  inset: auto -90px -120px auto;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(104, 225, 253, 0.26), transparent 68%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.76rem;
  color: var(--accent);
  font-weight: 700;
}

h1,
h2,
.panel-card strong,
.stat span {
  font-family: 'Space Grotesk', sans-serif;
}

h1 {
  margin: 14px 0 12px;
  font-size: clamp(2.8rem, 5vw, 5.5rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.lede {
  max-width: 62ch;
  font-size: 1.06rem;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

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

.primary {
  background: linear-gradient(135deg, var(--accent) 0%, #b7f5ff 100%);
  color: #08111d;
}

.secondary {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.12);
}

.hero-panel {
  border-radius: var(--radius);
  padding: 24px;
  display: grid;
  gap: 18px;
}

.panel-card {
  border-radius: 20px;
  padding: 22px;
  border: 1px solid rgba(255,255,255,0.08);
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
}

.panel-card.accent {
  background: linear-gradient(135deg, rgba(104,225,253,0.16), rgba(142,125,255,0.15));
}

.panel-label,
.card-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.panel-label {
  background: rgba(255,255,255,0.08);
  color: var(--muted);
  margin-bottom: 16px;
}

.panel-card strong {
  display: block;
  font-size: 1.7rem;
  margin-bottom: 10px;
}

.panel-card p {
  color: var(--muted);
  margin: 0;
  line-height: 1.7;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.stat {
  border-radius: 18px;
  padding: 18px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.06);
}

.stat span {
  display: block;
  font-size: 1.9rem;
  margin-bottom: 8px;
}

.stat p {
  margin: 0;
  color: var(--muted);
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 22px;
}

.info-card {
  border-radius: var(--radius);
  padding: 24px;
}

.info-card h2,
.section-heading h2 {
  margin: 16px 0 10px;
  font-size: 1.6rem;
}

.info-card p,
.info-card li,
.step p,
td {
  color: var(--muted);
  line-height: 1.7;
}

.info-card ul {
  margin: 18px 0 0;
  padding-left: 20px;
}

.card-tag.student {
  background: rgba(57, 217, 138, 0.14);
  color: #7ef0b5;
}

.card-tag.teacher {
  background: rgba(255, 184, 77, 0.14);
  color: #ffd38f;
}

.card-tag.management {
  background: rgba(104, 225, 253, 0.14);
  color: #8ff0ff;
}

.data-section,
.run-section {
  border-radius: calc(var(--radius) + 2px);
  padding: 28px 30px 30px;
  margin-top: 20px;
}

.section-heading {
  margin-bottom: 18px;
}

.table-wrap {
  overflow-x: auto;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.08);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
  background: rgba(255,255,255,0.02);
}

th,
td {
  padding: 18px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

th {
  color: var(--text);
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: rgba(255,255,255,0.04);
}

.demo-section {
  border-radius: calc(var(--radius) + 2px);
  padding: 28px 30px 30px;
  margin-top: 20px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.demo-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
  gap: 18px;
}

.editor-card,
.records-card {
  border-radius: 20px;
  padding: 22px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
}

.editor-header,
.records-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.editor-header h3,
.records-header h3 {
  margin: 0 0 6px;
  font-size: 1.3rem;
  font-family: 'Space Grotesk', sans-serif;
}

.editor-header p,
.records-header p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.small {
  min-height: 40px;
  padding: 0 14px;
  font-size: 0.92rem;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.field-grid label,
.search-box {
  display: grid;
  gap: 8px;
}

.field-grid span,
.search-box span {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.field-grid input,
.field-grid select,
.search-box input {
  width: 100%;
  padding: 14px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(7,17,31,0.7);
  color: var(--text);
  font: inherit;
}

.field-grid input:focus,
.field-grid select:focus,
.search-box input:focus {
  outline: 2px solid rgba(104, 225, 253, 0.35);
  border-color: rgba(104, 225, 253, 0.6);
}

.editor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.records-header {
  flex-wrap: wrap;
}

.search-box {
  min-width: 240px;
}

.records-table-wrap {
  overflow-x: auto;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.08);
}

.records-table {
  width: 100%;
  min-width: 820px;
  border-collapse: collapse;
  background: rgba(255,255,255,0.02);
}

.records-table th,
.records-table td {
  padding: 14px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.records-table td {
  vertical-align: top;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 700;
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.row-actions .button {
  min-height: 36px;
  padding: 0 12px;
  font-size: 0.84rem;
}

.ghost {
  background: rgba(255,255,255,0.03);
  border-color: rgba(255,255,255,0.12);
}

.danger {
  background: rgba(255, 91, 91, 0.12);
  border-color: rgba(255, 91, 91, 0.25);
}

.empty-state {
  padding: 24px;
  text-align: center;
  color: var(--muted);
}

.tech-section {
  border-radius: calc(var(--radius) + 2px);
  padding: 28px 30px 30px;
  margin-top: 20px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.tech-card {
  border-radius: 20px;
  padding: 20px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.035);
}

.tech-card h3 {
  margin: 0 0 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem;
}

.tech-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.step {
  border-radius: 20px;
  padding: 20px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.06);
}

.step span {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  color: #07101b;
  font-weight: 800;
  margin-bottom: 12px;
}

.step p {
  margin: 0;
}

@media (max-width: 980px) {
  .hero,
  .section-grid,
  .demo-grid,
  .tech-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    padding: 32px 24px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 20px, 1160px);
    padding-top: 16px;
  }

  .data-section,
  .hero-panel,
  .demo-section,
  .tech-section {
    padding: 20px;
  }

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

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