/* ════════════════════════════════════════════════════════
   CodePilot AI — Design System
   Primary: Black · Secondary: Yellow + White · Third: Baby-blue
   ════════════════════════════════════════════════════════ */

:root {
  --blue:         #5BB8F0;
  --blue-dark:    #2D9FDD;
  --blue-xdark:   #1A7EBB;
  --blue-light:   #EBF6FD;
  --blue-mid:     #AAD8F5;

  --yellow:       #FFC12E;
  --yellow-dark:  #E5A800;
  --yellow-light: #FFF8E6;

  --ink:          #F0F0F0;
  --ink-soft:     #C0C0C0;
  --ink-muted:    #888888;

  --bg:           #0D0D0D;
  --card:         #1A1A1A;
  --border:       #F97316;
  --border-soft:  rgba(249,115,22,0.22);

  --green:        #22C55E;
  --green-light:  #DCFCE7;
  --red-light:    #FEE2E2;
  --warn:         var(--yellow);
  --warn-light:   var(--yellow-light);

  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius:    14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-xs: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-sm: 0 2px 10px rgba(0,0,0,0.07);
  --shadow:    0 4px 20px rgba(0,0,0,0.07);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.09);

  --font: "Inter", "Segoe UI", system-ui, sans-serif;
  --mono: "Fira Code", "Cascadia Code", Consolas, monospace;
}

/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  padding-bottom: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ══════════════════════════════════════════════════════
   SITE HEADER
   ══════════════════════════════════════════════════════ */
.site-header {
  background: #0D0D0D;
  border-bottom: 1px solid var(--border);
  padding: 10px 60px 10px 20px;
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: 0 2px 16px rgba(0,0,0,0.55);
}
.site-header__inner {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
}

.site-header__logo-wrap {
  width: 84px;
  height: 84px;
  overflow: hidden;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.site-header__logo {
  width: 84px;
  height: 84px;
  display: block;
  transform: scale(1.55);
  transform-origin: center center;
}

.site-header__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.site-header__name {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.3px;
  line-height: 1;
  color: #fff;
}
.site-header__name .part-code  { color: #fff; font-weight: 800; }
.site-header__name .part-pilot { color: var(--yellow); font-weight: 800; }
.site-header__name .part-ai {
  display: inline-flex;
  align-items: center;
  background: var(--yellow);
  color: #0D0D0D;
  font-size: 0.38em;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 5px;
  padding: 3px 8px;
  vertical-align: middle;
  margin-left: 8px;
  position: relative;
  top: -3px;
}

.site-header__tagline {
  font-size: 0.72rem;
  font-weight: 500;
  color: rgba(255,255,255,0.55);
  line-height: 1.3;
  margin-top: 2px;
}

/* ── Header duck mascot ────────────────────────────────── */
.header-duck {
  position: absolute;
  top: 50%;
  right: 72px;
  transform: translateY(-50%);
  height: 42px;
  width: auto;
  pointer-events: none;
  user-select: none;
}

/* ── Hamburger button ──────────────────────────────────── */
.hamburger-btn {
  position: absolute;
  top: 16px;
  right: 20px;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-xs);
  transition: background 0.15s;
  z-index: 200;
}
.hamburger-btn:hover { background: rgba(255,255,255,0.12); }
.hamburger-btn span {
  display: block;
  width: 22px;
  height: 2.5px;
  background: #fff;
  border-radius: 99px;
  transition: background 0.15s;
}

/* ── Hamburger dropdown ────────────────────────────────── */
.hamburger-menu {
  position: absolute;
  top: 56px;
  right: 20px;
  background: #0D0D0D;
  border: 1px solid rgba(249,115,22,0.35);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  display: none;
  flex-direction: column;
  min-width: 220px;
  z-index: 300;
  overflow: hidden;
}
.hamburger-menu.open { display: flex; }
.hamburger-menu button {
  background: none;
  border: none;
  padding: 13px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font);
  color: #fff;
  text-align: left;
  cursor: pointer;
  transition: background 0.13s;
  border-bottom: 1px solid rgba(249,115,22,0.2);
}
.hamburger-menu button:last-child { border-bottom: none; }
.hamburger-menu button:hover { background: rgba(255,193,46,0.12); color: var(--yellow); }

/* ══════════════════════════════════════════════════════
   MAIN LAYOUT
   ══════════════════════════════════════════════════════ */
main {
  max-width: 820px;
  margin: 0 auto;
  padding: 28px 20px 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ══════════════════════════════════════════════════════
   MAIN CARD + CONTROLS ROW
   ══════════════════════════════════════════════════════ */
.main-card {
  padding: 22px 26px;
}
.sub-controls-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.sub-controls-spacer {
  flex: 1;
}
.control-group {
  display: flex;
  align-items: center;
  gap: 10px;
}
.control-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  white-space: nowrap;
}
.card-divider {
  border: none;
  border-top: 1px solid rgba(249, 115, 22, 0.15);
  margin: 18px 0;
}
.card-section {
  /* intentionally no extra padding — inherits from .main-card */
}

.output-type-select {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--ink);
  background: #111;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: auto;
  color-scheme: dark;
}
.output-type-select:focus {
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px rgba(255, 193, 46, 0.2);
}

/* ══════════════════════════════════════════════════════
   SELECTORS ROW (Output Type + Difficulty side by side)
   ══════════════════════════════════════════════════════ */
.selectors-row {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  flex-wrap: wrap;
}
.selector-group {
  flex: 1 1 0;
  min-width: 140px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.selector-group .cust-select {
  width: 100%;
}
.selector-group .cust-select__trigger {
  width: 100%;
  box-sizing: border-box;
}

/* ══════════════════════════════════════════════════════
   CUSTOM SELECT (saif-name / saif-card style)
   ══════════════════════════════════════════════════════ */
.cust-select {
  position: relative;
  display: inline-block;
}
.cust-select__trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--ink);
  background: #111;
  cursor: pointer;
  user-select: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.cust-select__trigger::after {
  content: "▾";
  font-size: 0.75em;
  opacity: 0.7;
  margin-left: 2px;
}
.cust-select__trigger:hover,
.cust-select.open > .cust-select__trigger {
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px rgba(255, 193, 46, 0.2);
}
.cust-select__panel {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  background: #0D0D0D;
  border: 1px solid rgba(249,115,22,0.35);
  border-radius: 12px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  white-space: nowrap;
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 500;
  min-width: 140px;
}
.cust-select__panel--up {
  top: auto;
  bottom: calc(100% + 10px);
  transform: translateY(6px);
}
.cust-select__panel.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.cust-select__opt {
  background: none;
  border: none;
  color: #fff;
  font-size: 0.88rem;
  font-weight: 500;
  font-family: var(--font);
  text-align: left;
  padding: 7px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s;
  width: 100%;
}
.cust-select__opt:hover {
  background: rgba(255,255,255,0.1);
}
.cust-select__opt.active {
  color: var(--yellow);
  font-weight: 700;
}
.cust-select__opt--locked {
  color: rgba(255,255,255,0.35);
  cursor: not-allowed;
  position: relative;
}
.cust-select__opt--locked:hover {
  background: rgba(255,255,255,0.04);
}
.cust-select__opt--locked::after {
  content: "Coming soon!";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: #1e1e1e;
  color: var(--yellow);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid var(--yellow);
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 0.15s;
}
.cust-select__opt--locked:hover::after {
  opacity: 1;
}

/* Teacher mode toggle */
.toggle-switch {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}
.toggle-switch input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-track {
  width: 44px;
  height: 24px;
  background: #444;
  border-radius: 999px;
  position: relative;
  transition: background 0.25s;
  flex-shrink: 0;
}
.toggle-switch input:checked + .toggle-track { background: var(--yellow); }
.toggle-thumb {
  position: absolute;
  top: 3px; left: 3px;
  width: 18px; height: 18px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.25s;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.toggle-switch input:checked + .toggle-track .toggle-thumb {
  transform: translateX(20px);
}
.toggle-hint {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--ink-muted);
  min-width: 26px;
  transition: color 0.2s;
}
.toggle-hint.on { color: var(--yellow-dark); }

/* ══════════════════════════════════════════════════════
   CARD
   ══════════════════════════════════════════════════════ */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-soft);
  padding: 22px 26px;
}
.card-title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blue);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.card-header-row .card-title { margin-bottom: 0; }

.badge-and-copy {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.concept-badge {
  display: inline-block;
  padding: 3px 11px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: rgba(91,184,240,0.14);
  color: var(--blue);
}
.concept-badge[data-concept="loop"]        { background: rgba(74,222,128,0.12); color: #4ADE80; }
.concept-badge[data-concept="if / else"]   { background: rgba(255,193,46,0.14); color: var(--yellow); }
.concept-badge[data-concept="list"]        { background: rgba(167,139,250,0.14); color: #A78BFA; }
.concept-badge[data-concept="arithmetic"]  { background: rgba(91,184,240,0.14); color: var(--blue); }
.concept-badge[data-concept="string"]      { background: rgba(251,146,60,0.14); color: #FB923C; }
.concept-badge[data-concept="print"]       { background: #2A2A2A; color: #CCC; }

.sandbox-badge {
  font-size: 0.63rem;
  font-weight: 600;
  background: rgba(74,222,128,0.12);
  color: #4ADE80;
  border-radius: 999px;
  padding: 2px 9px;
  letter-spacing: 0;
  text-transform: none;
}

/* ══════════════════════════════════════════════════════
   EXAMPLE CHIPS
   ══════════════════════════════════════════════════════ */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}
.chip {
  background: rgba(255,193,46,0.1);
  color: var(--yellow);
  border: 1.5px solid var(--yellow);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font);
  transition: background 0.15s, transform 0.12s, box-shadow 0.15s;
}
.chip:hover {
  background: rgba(255,193,46,0.22);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255,193,46,0.25);
}
.chip:active { transform: translateY(0); }

/* ══════════════════════════════════════════════════════
   INPUT AREA
   ══════════════════════════════════════════════════════ */
#prompt {
  width: 100%;
  min-height: 82px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  font-size: 1rem;
  font-family: var(--font);
  color: var(--ink);
  resize: vertical;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: #111;
  line-height: 1.5;
}
#prompt::placeholder { color: #555; }
#prompt:focus {
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px rgba(255, 193, 46, 0.2);
  background: #161616;
}

/* ── Upload row ──────────────────────────────────────── */
.upload-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}
.btn-upload {
  background: rgba(255,193,46,0.1);
  color: var(--yellow);
  border: 1.5px solid var(--yellow);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  padding: 8px 18px;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.15s, transform 0.12s;
}
.btn-upload:hover { background: rgba(255,193,46,0.22); transform: translateY(-1px); }
.btn-upload:active { transform: translateY(0); }
.file-name {
  font-size: 0.82rem;
  color: var(--ink-soft);
  font-weight: 500;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

/* ══════════════════════════════════════════════════════
   BUTTONS
   ══════════════════════════════════════════════════════ */
button {
  cursor: pointer;
  font-family: var(--font);
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--yellow);
  color: var(--ink);
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 12px 30px;
  transition: background 0.15s, transform 0.12s, box-shadow 0.15s;
  letter-spacing: 0.01em;
}
.btn-primary:hover {
  background: var(--yellow-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(255, 193, 46, 0.45);
}
.btn-primary:active { transform: translateY(0); box-shadow: none; }
.btn-primary:disabled { opacity: 0.55; transform: none; cursor: not-allowed; box-shadow: none; }

.btn-ghost {
  background: #2A2A2A;
  color: var(--ink-muted);
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 12px 22px;
  border: 1.5px solid #444;
  transition: background 0.15s, border-color 0.15s;
}
.btn-ghost:hover { background: #333; border-color: #555; }

.btn-copy {
  background: #2A2A2A;
  color: var(--ink);
  border: 1.5px solid #444;
  border-radius: 999px;
  font-size: 0.79rem;
  font-weight: 700;
  padding: 5px 14px;
  transition: background 0.15s, transform 0.12s;
}
.btn-copy:hover { background: rgba(255,193,46,0.15); border-color: var(--yellow); transform: translateY(-1px); }
.btn-copy:active { transform: translateY(0); }

.btn-retry {
  display: block;
  margin-top: 14px;
  background: rgba(255,193,46,0.1);
  color: var(--yellow);
  border: 1.5px solid var(--yellow);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  padding: 8px 20px;
  font-family: var(--font);
  transition: background 0.15s, transform 0.12s;
}
.btn-retry:hover { background: rgba(255,193,46,0.22); transform: translateY(-1px); }

/* ══════════════════════════════════════════════════════
   ALERTS
   ══════════════════════════════════════════════════════ */
.alert {
  display: flex;
  gap: 14px;
  padding: 18px 22px;
  border-radius: var(--radius);
  border: 1.5px solid;
}
.alert-warning { background: rgba(249,115,22,0.10); border-color: rgba(249,115,22,0.40); }
.alert-info    { background: rgba(91,184,240,0.08); border-color: rgba(91,184,240,0.35); }
.alert-icon    { font-size: 1.35rem; flex-shrink: 0; margin-top: 1px; }
.alert-title   { font-weight: 700; font-size: 0.94rem; color: var(--ink); margin-bottom: 4px; }
.alert-body    { font-size: 0.86rem; color: var(--ink-muted); margin-bottom: 10px; }

.oos-list { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.oos-list li button {
  background: #1A1A0A;
  border: 1.5px solid #FCD34D;
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--yellow-light);
  transition: background 0.15s;
}
.oos-list li button:hover { background: #2A2A10; }

/* ══════════════════════════════════════════════════════
   CODE BLOCK
   ══════════════════════════════════════════════════════ */
.code-wrap {
  background: #101318;
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
}
.code-wrap pre {
  font-family: var(--mono);
  font-size: 0.91rem;
  line-height: 1.75;
  color: #CDD6F4;
  white-space: pre-wrap;
  word-break: break-word;
}

.kw  { color: #89B4FA; font-weight: 600; }
.bi  { color: #5BB8F0; }
.str { color: #A6E3A1; }
.num { color: #FAB387; }
.cm  { color: #585B70; font-style: italic; }
.op  { color: #F5C2E7; }

/* ══════════════════════════════════════════════════════
   EXPLANATION
   ══════════════════════════════════════════════════════ */
.explanation-text {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-soft);
}
.explanation-text code {
  background: rgba(255,193,46,0.15);
  color: var(--yellow);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: var(--mono);
  font-size: 0.87em;
}

/* ══════════════════════════════════════════════════════
   TEACHER STEPS
   ══════════════════════════════════════════════════════ */
.teacher-steps {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1.5px dashed var(--border);
}
.steps-title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--blue);
  margin-bottom: 14px;
}
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
  counter-reset: steps;
}
.steps-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 0.91rem;
  line-height: 1.65;
  color: var(--ink-soft);
}
.steps-list li::before {
  content: counter(steps);
  counter-increment: steps;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  background: var(--blue);
  color: #fff;
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.steps-list li code {
  background: rgba(255,193,46,0.15);
  color: var(--yellow);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: var(--mono);
  font-size: 0.86em;
}

/* ══════════════════════════════════════════════════════
   OUTPUT PREVIEW
   ══════════════════════════════════════════════════════ */
.preview-box {
  background: #101318;
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-family: var(--mono);
  font-size: 0.9rem;
  color: #A6E3A1;
  white-space: pre-wrap;
  min-height: 44px;
  line-height: 1.65;
}

/* ══════════════════════════════════════════════════════
   QUIZ
   ══════════════════════════════════════════════════════ */
.quiz-card {
  border-left: 4px solid var(--yellow);
  background: #1C1A10;
}
.quiz-question {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 16px;
  line-height: 1.5;
}
.quiz-choices {
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.quiz-choice {
  background: #222;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  font-size: 0.91rem;
  font-weight: 500;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  font-family: var(--font);
  transition: background 0.15s, border-color 0.15s, transform 0.12s;
}
.quiz-choice:hover:not(:disabled) {
  background: rgba(255,193,46,0.12);
  border-color: var(--yellow);
  transform: translateX(3px);
}
.quiz-choice.correct  { background: rgba(74,222,128,0.13); border-color: #4ADE80; color: #4ADE80; font-weight: 600; }
.quiz-choice.wrong    { background: rgba(248,113,113,0.12); border-color: #F87171; color: #F87171; }
.quiz-choice.revealed { background: rgba(74,222,128,0.13); border-color: #4ADE80; color: #4ADE80; font-weight: 600; }
.quiz-choice:disabled { cursor: default; transform: none; }

.quiz-feedback {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: #0F1E14;
  border: 1.5px solid #2D6A40;
}
.quiz-feedback.wrong-feedback { background: #1E0F10; border-color: #6A2D32; }
#quiz-verdict { font-weight: 700; font-size: 0.94rem; display: block; margin-bottom: 6px; }
#quiz-reason  { font-size: 0.86rem; color: var(--ink-soft); line-height: 1.65; }

/* ══════════════════════════════════════════════════════
   WRITE CHALLENGE
   ══════════════════════════════════════════════════════ */
.write-challenge-card {
  border-left: 4px solid var(--blue);
  background: #111;
}
.challenge-desc {
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.6;
  margin-bottom: 14px;
  padding: 12px 14px;
  background: rgba(255,193,46,0.08);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--yellow);
}
.challenge-textarea {
  width: 100%;
  min-height: 120px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  font-size: 0.91rem;
  font-family: var(--mono);
  color: var(--ink);
  resize: vertical;
  outline: none;
  background: #101318;
  color: #CDD6F4;
  line-height: 1.65;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.challenge-textarea::placeholder { color: #4A5068; }
.challenge-textarea:focus {
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px rgba(255, 193, 46, 0.2);
}
.challenge-textarea:disabled { opacity: 0.7; cursor: not-allowed; }

.challenge-feedback {
  margin-top: 14px;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  line-height: 1.6;
}
.challenge-success {
  background: rgba(74,222,128,0.10);
  border: 1.5px solid #4ADE80;
  color: #4ADE80;
}
.challenge-wrong {
  background: #1E0F10;
  border: 1.5px solid #6A2D32;
  color: var(--ink-soft);
}
.challenge-feedback code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(255,255,255,0.08);
  padding: 1px 4px;
  border-radius: 3px;
}

.challenge-error-line,
.challenge-hint-line {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ink-soft);
}
.challenge-error-line { margin-bottom: 6px; }
.error-label {
  font-weight: 700;
  color: #F87171;
  margin-right: 6px;
}
.hint-label {
  font-weight: 700;
  color: var(--blue);
  margin-right: 6px;
}
.challenge-hint-line code {
  background: rgba(91,184,240,0.12);
  color: var(--blue);
  font-family: var(--mono);
  font-size: 0.85em;
  padding: 1px 5px;
  border-radius: 4px;
}

.challenge-actions {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.btn-challenge-action {
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  padding: 8px 20px;
  font-family: var(--font);
  border: 1.5px solid;
  transition: background 0.15s, transform 0.12s;
}
.btn-challenge-restart {
  background: rgba(91,184,240,0.08);
  color: var(--blue);
  border-color: var(--blue);
}
.btn-challenge-restart:hover {
  background: rgba(91,184,240,0.18);
  transform: translateY(-1px);
}

/* ══════════════════════════════════════════════════════
   TRY ANOTHER
   ══════════════════════════════════════════════════════ */
.try-another-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.try-another-label { font-size: 0.88rem; color: var(--ink-muted); }
.btn-try {
  background: rgba(255,193,46,0.1);
  color: var(--yellow);
  border: 1.5px solid var(--yellow);
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 700;
  padding: 8px 20px;
  font-family: var(--font);
  transition: background 0.15s, transform 0.12s;
}
.btn-try:hover { background: rgba(255,193,46,0.22); transform: translateY(-2px); }

/* ══════════════════════════════════════════════════════
   LOADING SPINNER
   ══════════════════════════════════════════════════════ */
.spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 3px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
  vertical-align: middle;
  margin-right: 7px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════════════════════
   TOAST
   ══════════════════════════════════════════════════════ */
#toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(90px);
  background: #0D0D0D;
  color: #A6E3A1;
  border: 1px solid rgba(249,115,22,0.35);
  padding: 11px 26px;
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 600;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 9999;
  pointer-events: none;
  white-space: nowrap;
}
#toast.show { transform: translateX(-50%) translateY(0); }

/* ══════════════════════════════════════════════════════
   MODALS
   ══════════════════════════════════════════════════════ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
}
.modal.open { display: flex; }

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  cursor: pointer;
}
.modal-content {
  position: relative;
  background: #1C1C1C;
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
  width: 100%;
  max-width: 560px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(249,115,22,0.3);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-soft);
  flex-shrink: 0;
}
.modal-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}
.modal-close {
  background: #333;
  border: none;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  font-size: 0.8rem;
  color: var(--ink-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.modal-close:hover { background: #444; }
.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  flex: 1;
}

/* ── Birth modal photos ─────────────────────────────── */
.birth-photos {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 16px;
}
.birth-photo {
  width: 130px;
  height: 160px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid rgba(249,115,22,0.35);
}

/* ── History items ──────────────────────────────────── */
.history-empty {
  color: var(--ink-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 24px 0;
}
.history-item {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 12px;
  background: #111;
}
.history-prompt {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.history-code {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  white-space: pre-wrap;
  word-break: break-word;
  background: #101318;
  color: #CDD6F4;
  padding: 10px 12px;
  border-radius: 6px;
  margin-bottom: 6px;
}
.history-date {
  font-size: 0.74rem;
  color: var(--ink-muted);
}

/* ── Account placeholder ────────────────────────────── */
.account-placeholder {
  text-align: center;
  padding: 32px 16px;
}
.account-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}
.account-coming-soon {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}
.account-sub {
  font-size: 0.88rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

/* ── Feedback form ──────────────────────────────────── */
.feedback-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-muted);
  margin-bottom: 8px;
}
.feedback-textarea {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.92rem;
  font-family: var(--font);
  color: var(--ink);
  resize: vertical;
  outline: none;
  background: #111;
  line-height: 1.5;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.feedback-textarea:focus {
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px rgba(255, 193, 46, 0.2);
  background: #161616;
}
.feedback-thanks {
  margin-top: 14px;
  font-size: 0.94rem;
  font-weight: 600;
  color: #15803D;
  text-align: center;
}

/* ── Saif Khalil hover contact card ───────────────────── */
.saif-name {
  color: var(--yellow-dark);
  font-weight: 700;
  cursor: default;
  border-bottom: 2px dashed var(--yellow);
}

.saif-card {
  position: fixed;
  background: #0D0D0D;
  border: 1px solid rgba(249,115,22,0.35);
  color: #fff;
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  white-space: nowrap;
  box-shadow: 0 8px 24px rgba(0,0,0,0.28);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 9999;
}

.saif-card.visible {
  opacity: 1;
  pointer-events: auto;
}

.saif-card::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 7px solid transparent;
  border-top-color: var(--ink);
}

.saif-card a {
  color: #fff;
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px;
  border-radius: 6px;
  transition: background 0.12s;
}

.saif-card a:hover {
  background: rgba(255,255,255,0.12);
}

/* ── CodePilot Birth modal ─────────────────────────────── */
.birth-modal-content {
  max-width: 560px;
}
.birth-story {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink);
  margin: 0 0 24px 0;
}
.birth-story strong {
  color: var(--yellow-dark);
}
.birth-photos {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}
.birth-photos img {
  width: 100%;
  border-radius: 10px;
  object-fit: cover;
  aspect-ratio: 4/3;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
}

/* ══════════════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════════════ */
footer {
  text-align: center;
  margin-top: 52px;
  font-size: 0.76rem;
  color: var(--ink-muted);
  letter-spacing: 0.01em;
}

/* ══════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════ */
@media (max-width: 620px) {
  .site-header { padding: 16px 16px 0; }
  .site-header__name { font-size: 1.5rem; }
  .site-header__tagline { font-size: 0.82rem; }
  .hamburger-btn { top: 14px; right: 14px; }
  .hamburger-menu { right: 14px; }
  .card { padding: 18px 16px; }
  .main-card { padding: 18px 16px; }
  .sub-controls-row { gap: 10px; }
  .sub-controls-spacer { display: none; }
  main { gap: 14px; padding-top: 18px; }
  .modal { padding: 20px 10px; }
  .modal-content { max-height: 90vh; }
}