/* CodeItAll Lab — interactive in-browser notebook */
:root {
  --black: #000;
  --white: #fff;
  --panel: #0c0c0c;
  --panel-2: #141414;
  --border: rgba(255,255,255,0.10);
  --muted: #8a8a8a;
  --accent: #8b1e1e;
  --code-bg: #0a0a0a;
  --radius: 16px;
  --font: "Montserrat", system-ui, sans-serif;
  --mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  --topbar-h: 56px;
  --mobile-nav-h: 64px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --lab-max: 760px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--black);
  color: var(--white);
  line-height: 1.45;
  -webkit-text-size-adjust: 100%;
  overscroll-behavior: none;
}

a { color: inherit; text-decoration: none; }
button, select, textarea, input { font: inherit; }
.mobile-only { display: none !important; }
.desktop-only { display: initial; }
.btn.desktop-only { display: inline-flex; }

.app {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 300px;
  grid-template-rows: var(--topbar-h) 1fr;
  height: 100vh;
  height: 100dvh;
  max-height: 100dvh;
}

.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 1.25rem;
  background: var(--white);
  color: var(--black);
  border-bottom: 1px solid #eee;
  z-index: 40;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  min-width: 0;
  letter-spacing: -0.01em;
}
.brand img { height: 24px; width: auto; flex-shrink: 0; }
.brand span {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.55;
}
.top-actions {
  display: flex;
  gap: 0.45rem;
  flex-wrap: nowrap;
  align-items: center;
  flex-shrink: 0;
}
.btn {
  border: 0;
  border-radius: 999px;
  padding: 0.5rem 1.05rem;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  background: var(--white);
  color: var(--black);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.btn:hover { opacity: 0.9; }
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }
.btn.ghost {
  background: transparent;
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.28);
}
.btn.accent {
  background: var(--accent);
  color: var(--white);
}
.btn.ok {
  background: var(--white);
  color: var(--black);
}
.btn.icon-btn {
  padding: 0.4rem 0.65rem;
  min-width: 40px;
  min-height: 40px;
  background: transparent;
  color: var(--white);
  border: 1px solid var(--border);
}

/* Topbar sits on white chrome like the site header — invert to black CTAs */
.topbar .btn {
  background: var(--black);
  color: var(--white);
}
.topbar .btn.ok {
  background: var(--black);
  color: var(--white);
}
.topbar .btn.ghost {
  background: transparent;
  color: var(--black);
  border: 1px solid #ddd;
}
.topbar .btn.accent {
  background: var(--accent);
  color: var(--white);
}
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.42rem 0.75rem;
  border-radius: 9px;
  background: #fff;
  color: #333;
  white-space: nowrap;
  border: 1px solid rgba(0,0,0,0.14);
  transition: box-shadow 0.35s ease, border-color 0.35s ease, background 0.35s ease, color 0.35s ease;
}
.status-pill::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
  box-shadow: 0 0 6px 1px currentColor;
}
.status-pill.ready {
  color: #0a7d34;
  background: #eafff2;
  border-color: rgba(16,185,90,0.55);
  box-shadow: 0 0 12px 1px rgba(16,185,90,0.55), 0 0 3px rgba(16,185,90,0.85);
}
.status-pill.loading {
  color: #9a6300;
  background: #fff6e6;
  border-color: rgba(245,170,30,0.55);
  box-shadow: 0 0 10px 1px rgba(245,170,30,0.5);
  animation: statusGlow 1.5s ease-in-out infinite;
}
.status-pill.error {
  color: #b81e1e;
  background: #fdecec;
  border-color: rgba(220,60,60,0.55);
  box-shadow: 0 0 13px 2px rgba(220,60,60,0.6);
}
@keyframes statusGlow {
  0%, 100% { box-shadow: 0 0 6px 0 rgba(245,170,30,0.3); }
  50% { box-shadow: 0 0 15px 3px rgba(245,170,30,0.72); }
}
@media (prefers-reduced-motion: reduce) {
  .status-pill.loading { animation: none; }
}

.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 50;
}
.backdrop[hidden] { display: none !important; }

.sidebar, .ai-panel {
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow: auto;
  padding: 1.1rem 0.9rem;
  -webkit-overflow-scrolling: touch;
}
.ai-panel {
  border-right: 0;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 0;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.panel-head h2,
.sidebar > h2,
.ai-panel > .panel-head h2 {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
  font-weight: 700;
}
.sidebar > h2.desktop-only { margin-bottom: 0.85rem; display: block; }

.project-list { display: flex; flex-direction: column; gap: 0.35rem; }
.project-item {
  text-align: left;
  width: 100%;
  background: transparent;
  border: 1px solid transparent;
  color: var(--white);
  border-radius: 12px;
  padding: 0.7rem 0.8rem;
  cursor: pointer;
  touch-action: manipulation;
  min-height: 48px;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.project-item:hover {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.08);
}
.project-item.active {
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.06);
}
.project-item.active strong { color: #fff; }
.project-item strong {
  display: block;
  font-size: 0.82rem;
  margin-bottom: 0.12rem;
  line-height: 1.3;
  font-weight: 600;
  color: rgba(255,255,255,0.88);
}
.project-item span { font-size: 0.7rem; color: var(--muted); }

.main {
  overflow: auto;
  padding: 1.75rem 1.25rem 2.5rem;
  background:
    radial-gradient(ellipse 80% 40% at 50% -10%, rgba(139,30,30,0.14), transparent 55%),
    #050505;
  -webkit-overflow-scrolling: touch;
  min-width: 0;
}
.lab-column {
  width: min(100%, var(--lab-max));
  margin-inline: auto;
}
.project-head {
  margin-bottom: 1.5rem;
  text-align: center;
}
.project-head-row {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.55rem;
  position: relative;
}
.project-head h1 {
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(1.45rem, 2.6vw, 2rem);
  margin: 0;
  line-height: 1.18;
  flex: 1;
  min-width: 0;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.project-head p {
  color: var(--muted);
  max-width: 46ch;
  margin-inline: auto;
  font-size: 0.92rem;
  line-height: 1.55;
}
.hint {
  margin-top: 0.65rem;
  font-size: 0.75rem;
  color: #666;
  letter-spacing: 0.02em;
}
.lab-footer {
  margin-top: 1.6rem;
  padding-top: 1.3rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: center;
}
.lab-footer .btn.mark-done {
  width: 100%;
  max-width: 280px;
  justify-content: center;
  min-height: 46px;
}
.projects-trigger {
  flex-shrink: 0;
  color: var(--black) !important;
  background: var(--white) !important;
  border: 0 !important;
  padding: 0.45rem 0.8rem;
  font-size: 0.75rem;
  position: absolute;
  right: 0;
  top: 0;
}

.cells {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  width: 100%;
}
.cell {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.step-md {
  padding: 1.05rem 1.15rem 0.85rem;
  background: #121212;
  border-bottom: 1px solid var(--border);
  color: #cfcfcf;
  font-size: 0.88rem;
  line-height: 1.55;
  text-align: left;
}
.step-md h1, .step-md h2, .step-md h3, .step-md h4 {
  font-family: "Fraunces", Georgia, serif;
  color: #fff;
  margin: 0 0 0.35rem;
  line-height: 1.25;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.step-md p { margin: 0 0 0.4rem; color: #a3a3a3; }
.step-md p:last-child { margin-bottom: 0; }
.step-md strong { color: #fff; }
.step-md code {
  font-family: var(--mono);
  font-size: 0.82em;
  background: rgba(255,255,255,0.07);
  padding: 0.12em 0.35em;
  border-radius: 4px;
}
.cell-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  background: #101010;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 2;
}
.cell-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #6a6a6a;
}
.cell-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.cell-actions .btn {
  padding: 0.45rem 0.95rem;
  font-size: 0.76rem;
  min-height: 38px;
}
.cell textarea.code-source {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  border: 0;
  outline: none;
  background: var(--code-bg);
  color: #e8e8e8;
  font-family: var(--mono);
  line-height: 1.55;
  padding: 0.9rem 1rem;
  tab-size: 4;
  font-size: max(16px, 0.85rem);
}

/* CodeMirror Python palette */
.CodeMirror {
  height: auto !important;
  min-height: 148px;
  font-family: var(--mono) !important;
  font-size: 13.5px;
  line-height: 1.6;
  background: #0c0c0c !important;
  border: 0;
}
.CodeMirror-scroll { min-height: 148px; }
.CodeMirror-gutters {
  background: #0a0a0a !important;
  border-right: 1px solid rgba(255,255,255,0.06) !important;
}
.CodeMirror-linenumber { color: #4a4a4a !important; }
.cm-s-material-darker span { font-family: var(--mono); }
.cm-s-material-darker .cm-keyword { color: #c792ea !important; }
.cm-s-material-darker .cm-string { color: #c3e88d !important; }
.cm-s-material-darker .cm-number { color: #f78c6c !important; }
.cm-s-material-darker .cm-comment { color: #5c6370 !important; font-style: italic; }
.cm-s-material-darker .cm-builtin { color: #82aaff !important; }
.cm-s-material-darker .cm-def { color: #82aaff !important; }
.cm-s-material-darker .cm-variable { color: #eceff1 !important; }
.cm-s-material-darker .cm-operator { color: #89ddff !important; }

.output {
  border-top: 1px solid var(--border);
  padding: 0.9rem 1.05rem;
  background: #080808;
  min-height: 2.25rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
  color: #c8c8c8;
}
.output:empty::before {
  content: "Run this cell to see output";
  color: #444;
  font-family: var(--font);
  font-size: 0.8rem;
  letter-spacing: 0.01em;
}
.output .err { color: #ff8a8a; }
.output .ok { color: #d0d0d0; }
.output img, .output canvas {
  max-width: 100%;
  height: auto;
  margin-top: 0.55rem;
  border-radius: 10px;
  background: #fff;
  display: block;
}
.output iframe {
  width: 100%;
  min-height: 240px;
  border: 0;
  border-radius: 10px;
  margin-top: 0.55rem;
  background: #fff;
}

.ai-messages {
  flex: 1;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding-right: 0.25rem;
  min-height: 0;
  -webkit-overflow-scrolling: touch;
}
.msg {
  border-radius: 12px;
  padding: 0.75rem 0.85rem;
  font-size: 0.85rem;
  background: var(--panel-2);
  border: 1px solid var(--border);
}
.msg.user { background: #1c1510; }
.msg.assistant { background: #12181c; }
.msg .who {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.msg pre {
  margin: 0.5rem 0;
  padding: 0.6rem;
  background: #000;
  border-radius: 8px;
  overflow: auto;
  max-width: 100%;
  font-size: 0.78rem;
}
.ai-compose {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.ai-compose textarea {
  width: 100%;
  min-height: 72px;
  resize: vertical;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--code-bg);
  color: var(--white);
  padding: 0.7rem;
  font-size: 16px; /* prevent iOS zoom */
}
.ai-settings {
  font-size: 0.75rem;
  color: var(--muted);
  display: grid;
  gap: 0.4rem;
}
.ai-settings input {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--code-bg);
  color: var(--white);
  padding: 0.65rem 0.7rem;
  font-size: 16px;
  margin-top: 0.25rem;
}
.ai-settings details summary {
  cursor: pointer;
  font-weight: 700;
  color: #ccc;
  padding: 0.35rem 0;
}
.ai-save {
  color: var(--black) !important;
  background: var(--white) !important;
  border: 0 !important;
  margin-top: 0.35rem;
  width: 100%;
}
.ai-note { margin-top: 0.4rem; line-height: 1.4; }

.mobile-nav { display: none; }

/* Tablet */
@media (max-width: 1100px) {
  .app {
    grid-template-columns: 220px 1fr;
    grid-template-rows: var(--topbar-h) 1fr auto;
  }
  .ai-panel {
    grid-column: 1 / -1;
    max-height: 36vh;
    border-left: 0;
    border-top: 1px solid var(--border);
  }
}

/* Phone / small tablets — drawer + bottom tabs */
@media (max-width: 760px) {
  .mobile-only { display: flex !important; }
  .desktop-only { display: none !important; }
  .btn.desktop-only { display: none !important; }
  .sidebar > h2.desktop-only { display: none !important; }

  .app {
    grid-template-columns: 1fr;
    grid-template-rows: var(--topbar-h) 1fr var(--mobile-nav-h);
    padding-bottom: var(--safe-bottom);
  }

  .topbar { padding: 0.55rem 0.75rem; }
  .brand span { display: none; }
  .status-pill {
    font-size: 0.65rem;
    padding: 0.3rem 0.5rem;
    max-width: 7.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .top-actions .btn {
    padding: 0.5rem 0.8rem;
    font-size: 0.78rem;
    min-height: 44px;
  }

  .main {
    grid-column: 1;
    grid-row: 2;
    padding: 1rem 0.85rem calc(1rem + var(--safe-bottom));
    width: 100%;
  }
  .lab-column { width: 100%; max-width: none; }
  .project-head { margin-bottom: 1.1rem; text-align: left; }
  .project-head-row {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .project-head h1 { font-size: 1.28rem; text-align: left; }
  .project-head p { margin-inline: 0; text-align: left; }
  .hint { font-size: 0.72rem; margin-top: 0.5rem; text-align: left; }
  .hint .btn.mark-done {
    width: 100%;
    justify-content: center;
    min-height: 44px;
    margin: 0.25rem 0;
  }
  .projects-trigger {
    position: static;
    min-height: 40px;
  }

  .cells { gap: 0.85rem; }
  .cell { border-radius: 14px; }
  .step-md { padding: 0.85rem 0.85rem 0.65rem; font-size: 0.88rem; }
  .step-md h1, .step-md h2, .step-md h3, .step-md h4 { font-size: 1rem; }
  .cell-toolbar {
    padding: 0.5rem 0.65rem;
    flex-wrap: wrap;
  }
  .cell-actions {
    width: 100%;
    justify-content: stretch;
  }
  .cell-actions .btn {
    flex: 1;
    min-height: 44px;
    font-size: 0.85rem;
    padding-left: 0.35rem;
    padding-right: 0.35rem;
  }
  .cell textarea.code-source {
    min-height: 160px;
    padding: 0.75rem;
    font-size: 16px;
    line-height: 1.5;
  }
  .CodeMirror {
    font-size: 15px !important;
    min-height: 160px;
  }
  .output {
    padding: 0.75rem;
    font-size: 0.78rem;
  }
  .output iframe { min-height: 200px; }

  /* Projects drawer */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(86vw, 320px);
    max-width: 100%;
    z-index: 60;
    transform: translateX(-105%);
    transition: transform 0.22s ease;
    border-right: 1px solid var(--border);
    padding: 0.85rem;
    padding-top: calc(0.85rem + env(safe-area-inset-top, 0px));
    box-shadow: 8px 0 32px rgba(0,0,0,0.45);
  }
  .app.show-projects .sidebar { transform: translateX(0); }

  /* AI sheet */
  .ai-panel {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    height: min(78dvh, 640px);
    max-height: calc(100dvh - var(--topbar-h));
    z-index: 60;
    transform: translateY(110%);
    transition: transform 0.25s ease;
    border-radius: 20px 20px 0 0;
    border: 1px solid var(--border);
    border-bottom: 0;
    padding: 0.85rem;
    padding-bottom: calc(0.85rem + var(--mobile-nav-h) + var(--safe-bottom));
    box-shadow: 0 -12px 40px rgba(0,0,0,0.5);
  }
  .app.show-ai .ai-panel { transform: translateY(0); }

  .backdrop:not([hidden]) {
    display: block;
  }
  .app.show-projects .backdrop,
  .app.show-ai .backdrop {
    display: block;
  }

  .mobile-nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-column: 1;
    grid-row: 3;
    background: #0e0e0e;
    border-top: 1px solid var(--border);
    z-index: 45;
    padding-bottom: var(--safe-bottom);
    height: calc(var(--mobile-nav-h) + var(--safe-bottom));
  }
  .mob-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    background: transparent;
    border: 0;
    color: var(--muted);
    font-size: 0.68rem;
    font-weight: 700;
    cursor: pointer;
    padding: 0.35rem;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
  }
  .mob-tab.active { color: var(--white); }
  .mob-tab.active .mob-ico { color: var(--accent); }
  .mob-ico {
    font-size: 1.05rem;
    line-height: 1;
  }
}

@media (max-width: 420px) {
  .project-item strong { font-size: 0.8rem; }
  .status-pill { display: none; }
}