:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #eef3ff;
  --text: #172033;
  --muted: #546179;
  --line: #d7dfee;
  --primary: #2247d9;
  --primary-soft: #dfe6ff;
  --accent: #0f9d76;
  --danger: #c0392b;
  --warning: #b7791f;
  --shadow: 0 18px 40px rgba(29, 45, 94, 0.08);
  --radius: 18px;
  --radius-sm: 12px;
  --max: 1180px;
}

:root[data-theme="dark"] {
  --bg: #07111f;
  --surface: #0d1a2c;
  --surface-2: #12243e;
  --text: #ecf2ff;
  --muted: #9cadc8;
  --line: #243754;
  --primary: #7aa2ff;
  --primary-soft: rgba(122, 162, 255, 0.14);
  --accent: #44d6a8;
  --danger: #ff7a7a;
  --warning: #f8c35d;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 80%, #dbe7ff 20%) 100%);
  color: var(--text);
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
}

.container {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

.section {
  padding: 4.5rem 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 2rem;
}

.section-heading h2 {
  margin: 0.35rem 0 0.8rem;
  font-size: clamp(1.9rem, 3.5vw, 3rem);
}

.section-heading p,
.section-heading li,
p,
li {
  color: var(--muted);
  line-height: 1.7;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--accent);
  margin: 0;
}

.topbar {
  background: var(--primary);
  color: #fff;
  text-align: center;
  padding: 0.85rem 1rem;
  font-weight: 600;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--surface) 88%, transparent 12%);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-weight: 800;
  color: var(--text);
}

.logo-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: inline-grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), #7f8bff);
  color: #fff;
  box-shadow: var(--shadow);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  font-weight: 600;
}

.hero {
  padding: 5.5rem 0 4rem;
}

.hero-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: start;
}

.hero-copy h1 {
  font-size: clamp(2.5rem, 5vw, 4.7rem);
  line-height: 1.05;
  margin: 0.6rem 0 1rem;
}

.hero-copy p {
  font-size: 1.06rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin: 1.6rem 0;
}

.primary-btn,
.secondary-btn,
.ghost-btn,
button {
  border: 0;
  cursor: pointer;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.18s ease, opacity 0.18s ease, background 0.18s ease;
}

.primary-btn,
.secondary-btn,
.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.92rem 1.2rem;
}

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

.secondary-btn {
  background: var(--primary-soft);
  color: var(--primary);
}

.ghost-btn {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
}

button:hover,
.primary-btn:hover,
.secondary-btn:hover,
.ghost-btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

button:disabled,
.primary-btn:disabled,
.secondary-btn:disabled,
.ghost-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.hero-panel,
.founder-panel,
.progress-card,
.playground-panel,
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 1.45rem;
}

.panel-grid {
  display: grid;
  gap: 1rem;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.metric-box {
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--line);
}

.metric-box strong {
  display: block;
  font-size: 1.2rem;
  margin-bottom: 0.3rem;
}

.mission {
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface-2) 78%, var(--surface) 22%);
  border: 1px solid var(--line);
}

.stats-grid,
.features-grid,
.paths-grid,
.roadmap-grid,
.modules-grid,
.planner-grid,
.schema-grid,
.query-pack-grid,
.capstone-grid,
.challenge-grid,
.glossary-grid,
.faq-grid,
.founder-grid,
.doc-grid {
  display: grid;
  gap: 1rem;
}

.stats-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.features-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.paths-grid,
.roadmap-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.schema-grid,
.query-pack-grid,
.capstone-grid,
.challenge-grid,
.glossary-grid,
.faq-grid,
.doc-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-card,
.feature-card,
.path-card,
.roadmap-card,
.module-card,
.planner-card,
.schema-card,
.query-pack-card,
.capstone-card,
.challenge-card,
.glossary-card,
.faq-card,
.doc-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
}

.stat-card strong {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--primary);
}

.feature-card h3,
.path-card h3,
.roadmap-card h3,
.module-card h3,
.planner-card h3,
.schema-card h3,
.query-pack-card h3,
.capstone-card h3,
.challenge-card h3,
.glossary-card h3,
.doc-card h3,
.progress-card h3,
.playground-panel h3,
.founder-panel h3 {
  margin-top: 0;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.83rem;
  font-weight: 700;
}

.module-top,
.challenge-top,
.schema-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 0.85rem;
}

.module-card.done,
.challenge-card.done {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line) 45%);
}

.duration,
.challenge-category,
.row-count {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

.module-card details {
  margin: 1rem 0;
}

.module-card summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-card summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--text);
}

.faq-card p {
  margin-top: 0.85rem;
}

.module-body h4 {
  margin-bottom: 0.4rem;
}

.progress-shell {
  display: grid;
  gap: 1.3rem;
  grid-template-columns: 0.7fr 1.3fr;
}

.progress-card {
  padding: 1.4rem;
}

.progress-bar {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--surface-2);
  border: 1px solid var(--line);
}

.progress-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--primary));
}

.progress-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.progress-stats article {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.progress-stats strong {
  display: block;
  font-size: 1.3rem;
  color: var(--primary);
}

.playground-wrap {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 1rem;
}

.playground-panel {
  padding: 1.2rem;
}

.editor-tools,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 1rem;
}

textarea,
select {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 92%, var(--surface-2) 8%);
  color: var(--text);
  padding: 1rem;
  font: 500 0.98rem/1.6 "Fira Code", "SFMono-Regular", Consolas, monospace;
}

textarea {
  min-height: 360px;
  resize: vertical;
}

label {
  display: inline-block;
  margin-bottom: 0.45rem;
  font-weight: 700;
}

.status {
  margin-top: 0.9rem;
  padding: 0.85rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--muted);
}

.status[data-type="success"] {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line) 50%);
  color: var(--accent);
}

.status[data-type="error"] {
  border-color: color-mix(in srgb, var(--danger) 50%, var(--line) 50%);
  color: var(--danger);
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.5rem 0;
}

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

th,
td {
  padding: 0.8rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-2);
  position: sticky;
  top: 0;
}

.result-meta {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.error-box,
.empty-state {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem;
  background: var(--surface-2);
}

.history-list,
.resource-list,
.contact-list {
  padding-left: 1.1rem;
}

.history-btn {
  width: 100%;
  text-align: left;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 0.8rem 1rem;
  border-radius: 14px;
  margin-bottom: 0.65rem;
}

.query-pack-card pre {
  overflow: auto;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.9rem;
  min-height: 160px;
  color: var(--text);
}

.challenge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1rem 0 0.5rem;
}

.hidden {
  display: none;
}

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

.founder-grid {
  grid-template-columns: 0.85fr 1.15fr;
}

.founder-panel {
  padding: 1.35rem;
}

.founder-panel blockquote {
  margin: 1rem 0;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--primary);
  background: var(--surface-2);
  border-radius: 12px;
  color: var(--text);
}

.link-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.link-cloud a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.55rem 0.9rem;
  background: var(--surface-2);
}

.doc-card p {
  min-height: 90px;
}

.site-footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-hero {
  padding: 3.5rem 0 2rem;
}

.page-hero h1 {
  margin: 0.4rem 0 0.8rem;
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.split-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1rem;
}

.session-card,
.notice-card,
.auth-card,
.dashboard-card,
.admin-card,
.resource-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
}

.session-actions,
.form-actions,
.stack-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1rem;
}

.input-grid,
.auth-grid,
.dashboard-grid,
.admin-grid,
.summary-grid,
.resource-grid {
  display: grid;
  gap: 1rem;
}

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

.input-grid input,
.input-grid textarea,
.auth-card input,
.auth-card textarea,
.admin-card input,
.admin-card textarea,
.admin-card select {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 92%, var(--surface-2) 8%);
  color: var(--text);
  padding: 0.9rem 1rem;
  font: inherit;
}

.auth-card label,
.admin-card label {
  display: block;
  margin-bottom: 0.35rem;
}

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

.table-lite th,
.table-lite td {
  padding: 0.75rem 0.8rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.spotlight {
  padding: 1rem 1.1rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  margin-top: 1rem;
}

@media (max-width: 1080px) {
  .hero-grid,
  .split-layout,
  .progress-shell,
  .playground-wrap,
  .founder-grid,
  .features-grid,
  .paths-grid,
  .roadmap-grid,
  .planner-grid,
  .schema-grid,
  .query-pack-grid,
  .capstone-grid,
  .challenge-grid,
  .glossary-grid,
  .faq-grid,
  .doc-grid,
  .auth-grid,
  .dashboard-grid,
  .admin-grid,
  .resource-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 720px) {
  .nav-wrap,
  .footer-wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero,
  .section {
    padding: 3.2rem 0;
  }

  .hero-grid,
  .split-layout,
  .stats-grid,
  .features-grid,
  .paths-grid,
  .roadmap-grid,
  .modules-grid,
  .planner-grid,
  .progress-shell,
  .playground-wrap,
  .schema-grid,
  .query-pack-grid,
  .capstone-grid,
  .challenge-grid,
  .glossary-grid,
  .faq-grid,
  .founder-grid,
  .doc-grid,
  .metric-row,
  .progress-stats,
  .auth-grid,
  .dashboard-grid,
  .admin-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  textarea {
    min-height: 300px;
  }
}