@import url("https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap");

:root {
  --bg: #0a0f1a;
  --panel: #111827;
  --panel-2: #151f33;
  --ink: #e6edf7;
  --muted: #96a6c6;
  --accent: #23c9a9;
  --accent-dark: #169a80;
  --mint: #6bc2ff;
  --line: #223150;
  --shadow: 0 16px 42px rgba(0, 0, 0, 0.44);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 380px at 90% -15%, rgba(35, 201, 169, 0.18) 0%, transparent 62%),
    radial-gradient(700px 300px at -10% 20%, rgba(107, 194, 255, 0.16) 0%, transparent 64%),
    var(--bg);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: -1;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  background: rgba(10, 15, 26, 0.86);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 20px;
}

.brand {
  text-decoration: none;
  color: #d8ffef;
  font-weight: 800;
  font-size: 1.1rem;
  font-family: "JetBrains Mono", "Consolas", monospace;
  letter-spacing: 0.02em;
}

.brand::before {
  content: ">_ ";
  color: var(--accent);
}

.nav-links {
  display: none;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.nav-links.is-visible {
  display: flex;
}

.nav-links a.is-hidden {
  display: none;
}

.nav-links a {
  text-decoration: none;
  color: #c8d7f1;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(35, 201, 169, 0.08);
  border-color: rgba(35, 201, 169, 0.38);
  color: #eafff9;
}

.auth-slot {
  min-height: 38px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 40px 20px 86px;
}

.hero {
  background: linear-gradient(140deg, rgba(21, 31, 51, 0.98) 0%, rgba(17, 24, 39, 0.98) 100%);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: clamp(20px, 4vw, 44px);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.eyebrow {
  margin: 0 0 8px;
  color: #8de7d6;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 0.8rem;
}

.lead {
  margin: 16px 0 26px;
  color: var(--muted);
  max-width: 62ch;
  line-height: 1.6;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 18px;
  text-decoration: none;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.32);
}

.btn-primary {
  background: var(--accent);
  color: #03140f;
  border-color: transparent;
}

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-secondary {
  background: rgba(107, 194, 255, 0.08);
  color: var(--mint);
  border-color: rgba(107, 194, 255, 0.35);
}

.project-input {
  min-width: 260px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(10, 15, 26, 0.8);
  color: var(--ink);
  font: inherit;
}

.project-input:focus {
  outline: 2px solid rgba(35, 201, 169, 0.45);
  outline-offset: 1px;
}

.code-input {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #0c1422;
  color: #dfeaff;
  font-family: "JetBrains Mono", "Consolas", monospace;
  font-size: 0.9rem;
  line-height: 1.45;
  padding: 12px;
}

.code-input:focus {
  outline: 2px solid rgba(107, 194, 255, 0.45);
  outline-offset: 1px;
}

.feedback-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.feedback-grid label,
.stack label {
  display: grid;
  gap: 6px;
}

.feedback-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.feedback-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.ide-feedback-card .code-block {
  min-height: 80px;
  max-height: 160px;
}

.feedback-drawer {
  position: fixed;
  top: 74px;
  right: 0;
  width: min(420px, 95vw);
  height: calc(100vh - 74px);
  background: #0f1728;
  border-left: 1px solid var(--line);
  box-shadow: -20px 0 34px rgba(0, 0, 0, 0.45);
  padding: 16px;
  overflow: auto;
  z-index: 70;
  transform: translateX(102%);
  transition: transform 180ms ease;
}

.feedback-drawer.is-open {
  transform: translateX(0);
}

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

.feedback-drawer-head h2 {
  margin: 0;
  font-size: 1.1rem;
}

.feedback-drawer .code-block {
  min-height: 96px;
  max-height: 220px;
}

.ide-page.ide-focus-mode .feedback-drawer {
  top: 0;
  height: 100vh;
}

.grid {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.card h2 {
  margin-top: 0;
  font-size: 1.1rem;
  color: #e9f2ff;
}

.card li,
.card p {
  margin: 8px 0;
  color: var(--muted);
}

.status-chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--line);
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.82rem;
}

.stack {
  display: grid;
  gap: 14px;
}

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

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

th,
td {
  text-align: left;
  border-bottom: 1px solid var(--line);
  padding: 10px;
  font-size: 0.94rem;
}

tbody tr:hover {
  background: rgba(35, 201, 169, 0.06);
}

th {
  color: var(--muted);
  font-weight: 700;
}

.ide-layout {
  display: grid;
  --editor-pane: 50%;
  grid-template-columns: minmax(280px, var(--editor-pane)) 12px minmax(280px, 1fr);
  gap: 0;
}

.editor-shell {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: #0f1728;
  min-height: 560px;
}

.editor-toolbar {
  padding: 10px;
  background: #10192b;
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--line);
}

.editor-btn {
  background: #1a2640;
  color: #bfd1f7;
  border: 1px solid #2a3d63;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

.editor-btn.active {
  background: #0f513f;
  border-color: #2cb497;
  color: #dffdf6;
}

.editor-canvas {
  width: 100%;
  height: 500px;
}

.preview-frame {
  width: 100%;
  min-height: 560px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
}

.pane-divider {
  width: 100%;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(107, 194, 255, 0.25), rgba(35, 201, 169, 0.4));
  border: 1px solid rgba(107, 194, 255, 0.5);
  cursor: col-resize;
  min-height: 560px;
  align-self: stretch;
  touch-action: none;
}

.pane-resizing,
.pane-resizing * {
  cursor: col-resize !important;
  user-select: none !important;
}

.ide-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.ide-header h1 {
  margin: 0;
  font-size: clamp(1.2rem, 3vw, 1.9rem);
}

.assignment-panel {
  position: fixed;
  top: 74px;
  right: 0;
  width: min(480px, 95vw);
  height: calc(100vh - 74px);
  background: #0f1728;
  border-left: 1px solid var(--line);
  box-shadow: -20px 0 34px rgba(0, 0, 0, 0.45);
  padding: 12px;
  overflow: auto;
  z-index: 71;
  transform: translateX(102%);
  transition: transform 180ms ease;
}

.assignment-panel.is-open {
  transform: translateX(0);
}

.assignment-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.assignment-brief-title {
  margin: 0;
  font-weight: 700;
  color: #e8f6ff;
}

.assignment-brief-text {
  margin: 10px 0 0;
  max-height: 180px;
  overflow: auto;
  border: 1px solid rgba(107, 194, 255, 0.25);
  border-radius: 8px;
  padding: 10px;
  background: #0b1320;
  color: #d7e9ff;
  font-family: "JetBrains Mono", "Consolas", monospace;
  font-size: 0.84rem;
  line-height: 1.45;
  white-space: pre-wrap;
}

.assignment-task-tracker {
  margin-top: 10px;
  border: 1px solid rgba(107, 194, 255, 0.25);
  border-radius: 8px;
  padding: 10px;
  background: rgba(9, 15, 25, 0.78);
  display: grid;
  gap: 8px;
}

.assignment-task-current {
  margin: 0;
  color: #e7f6ff;
  font-weight: 600;
}

.assignment-panel.is-empty {
  opacity: 0.92;
}

.ide-page {
  min-height: 100vh;
  overflow: hidden;
}

.ide-page .topbar {
  position: fixed;
  left: 0;
  right: 0;
}

.ide-page .shell.ide-shell {
  max-width: none;
  width: 100%;
  padding: 84px 16px 16px;
  height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
  transition: padding-right 180ms ease;
}

.ide-page.assignment-panel-open .shell.ide-shell {
  padding-right: calc(16px + min(480px, 95vw));
}

.focus-exit-btn {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 60;
}

.ide-page.ide-focus-mode {
  background: #070b12;
}

.ide-page.ide-focus-mode::before {
  display: none;
}

.ide-page.ide-focus-mode .topbar,
.ide-page.ide-focus-mode .ide-header {
  display: none;
}

.ide-page.ide-focus-mode .assignment-panel {
  display: none;
}

.ide-page.ide-focus-mode.assignment-panel-open .shell.ide-shell {
  padding-right: 0;
}

.ide-page.ide-focus-mode .feedback-drawer {
  top: 0;
  height: 100vh;
}

.ide-page.ide-focus-mode .assignment-panel {
  top: 0;
  height: 100vh;
}

.ide-page.ide-focus-mode .shell.ide-shell {
  padding: 0;
  height: 100vh;
}

.ide-page.ide-focus-mode .ide-layout-full {
  height: 100vh;
}

.ide-layout-full {
  margin-top: 0;
  min-height: 0;
  height: 100%;
}

.ide-layout-full .editor-shell,
.ide-layout-full .preview-frame {
  min-height: 0;
  height: 100%;
}

.ide-layout-full .pane-divider {
  min-height: 0;
  height: 100%;
}

.ide-layout-full .editor-canvas {
  height: calc(100% - 51px);
}

.muted {
  color: var(--muted);
}

.review-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.code-block {
  margin: 0;
  min-height: 220px;
  max-height: 360px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  background: #0c1422;
  color: #d6e6ff;
  font-family: "JetBrains Mono", "Consolas", monospace;
  font-size: 0.86rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.review-btn {
  padding: 6px 12px;
  font-size: 0.82rem;
}

.reference-hero {
  position: relative;
  overflow: hidden;
}

.reference-hero::after {
  content: "";
  position: absolute;
  width: 280px;
  height: 280px;
  right: -70px;
  top: -70px;
  border-radius: 999px;
  background: radial-gradient(circle at center, rgba(107, 194, 255, 0.24), transparent 68%);
  pointer-events: none;
}

.reference-jump-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.reference-jump-links a {
  text-decoration: none;
  color: #d8f2ff;
  border: 1px solid rgba(107, 194, 255, 0.45);
  background: rgba(19, 39, 65, 0.65);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.88rem;
}

.reference-jump-links a:hover {
  border-color: rgba(35, 201, 169, 0.55);
  color: #ebfff8;
}

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

.reference-tip {
  background: linear-gradient(145deg, rgba(17, 30, 51, 0.94), rgba(17, 24, 39, 0.94));
}

.reference-subtitle {
  margin: 0 0 8px;
  font-size: 0.92rem;
  color: #9cd6ff;
  letter-spacing: 0.02em;
}

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

.reference-render-surface {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f6f8ff;
  padding: 16px;
  min-height: 220px;
}

.sample-card {
  background: #ffffff;
  border: 1px solid #d9d9d9;
  border-radius: 12px;
  padding: 16px;
  width: 260px;
  color: #1f2430;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.sample-card h2 {
  margin-top: 0;
  margin-bottom: 8px;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: 1.1rem;
}

.sample-card p {
  color: #455066;
  margin-bottom: 12px;
}

.sample-card button {
  border: 0;
  border-radius: 8px;
  padding: 8px 12px;
  background: #223b62;
  color: #ecf4ff;
  font-weight: 600;
}

.sample-nav-render {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sample-nav-render a {
  text-decoration: none;
  background: #1b2a44;
  color: #e8f1ff;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid #2b4368;
}

.sample-nav-render a:hover {
  background: #23406a;
}

.practice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
}

.practice-card {
  background: linear-gradient(145deg, rgba(16, 28, 47, 0.92), rgba(12, 22, 37, 0.96));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
}

.practice-card h3 {
  margin: 0;
}

.practice-card details {
  border: 1px solid rgba(107, 194, 255, 0.35);
  border-radius: 10px;
  padding: 8px;
  background: rgba(13, 24, 43, 0.78);
}

.practice-card summary {
  cursor: pointer;
  color: #d9ebff;
  font-weight: 600;
}

.practice-snippet {
  min-height: 96px;
  max-height: 210px;
  font-size: 0.82rem;
}

.practice-search-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.practice-search-row .project-input {
  width: 100%;
}

.practice-workspace {
  display: grid;
  grid-template-columns: minmax(260px, 340px) 1fr;
  gap: 14px;
}

.practice-list {
  display: grid;
  gap: 8px;
  max-height: 620px;
  overflow: auto;
  padding-right: 4px;
}

.practice-list-item {
  text-align: left;
  border: 1px solid var(--line);
  background: rgba(11, 21, 36, 0.92);
  color: var(--ink);
  border-radius: 10px;
  padding: 10px;
  cursor: pointer;
  display: grid;
  gap: 4px;
}

.practice-list-item:hover {
  border-color: rgba(35, 201, 169, 0.55);
}

.practice-list-item.is-active {
  border-color: rgba(35, 201, 169, 0.8);
  background: rgba(17, 45, 41, 0.65);
}

.practice-list-title {
  font-weight: 700;
  color: #e9f7ff;
}

.practice-list-meta {
  color: var(--muted);
  font-size: 0.84rem;
}

.practice-detail {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(12, 21, 36, 0.9);
  padding: 14px;
}

.practice-panels {
  margin-top: 8px;
}

.practice-panel {
  border: 1px solid rgba(107, 194, 255, 0.3);
  border-radius: 10px;
  padding: 10px;
  background: rgba(10, 18, 30, 0.8);
}

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

.practice-panel-head h4 {
  margin: 0;
  font-size: 0.95rem;
}

.practice-code {
  min-height: 140px;
  max-height: 360px;
  margin-top: 6px;
}

#advanced-editor > summary {
  cursor: pointer;
  color: #d7ebff;
}

@media (max-width: 900px) {
  .ide-layout {
    grid-template-columns: 1fr;
  }

  .reference-grid,
  .example-grid {
    grid-template-columns: 1fr;
  }

  .pane-divider {
    display: none;
  }

  .ide-page {
    overflow: auto;
  }

  .ide-page .shell.ide-shell {
    height: auto;
    min-height: 100vh;
    padding-top: 92px;
  }

  .ide-layout-full .editor-shell,
  .ide-layout-full .preview-frame {
    min-height: 420px;
    height: 420px;
  }

  .focus-exit-btn {
    top: 10px;
    right: 10px;
  }

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

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

  .practice-workspace {
    grid-template-columns: 1fr;
  }

  .ide-page.assignment-panel-open .shell.ide-shell {
    padding-right: 16px;
  }
}

@media (max-width: 740px) {
  .topbar {
    padding: 12px;
  }

  .nav-links {
    order: 3;
    width: 100%;
  }
}