/* ═══════════════════════════════════════════════════════════════════════════
 *  FEI TeamArt · Scene Drawing — shared engine styles
 *  Reuses the exact design tokens, fonts, and component language already
 *  established in /lessons/*/index.html (ink/accent/gold/green palette,
 *  Montserrat + Open Sans, .step-card / .video-frame / .btn system).
 *  This file is shared by every Scene Drawing course/lesson page.
 *  DO NOT duplicate this into individual lesson files — link to it instead.
 * ═══════════════════════════════════════════════════════════════════════════ */

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --ink: #1a1d2b;
  --ink-soft: #475569;
  --ink-muted: #94a3b8;
  --border: #e8ecf2;
  --paper: #faf8ff;
  --accent: #67e8f9;
  --gold: #c8a96e;
  --green: #1d9e75;
  --purple: #a78bfa;
  --pink: #fda4af;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

body {
  font-family: 'Open Sans', sans-serif;
  background: linear-gradient(135deg, #e9d8fd 0%, #d4e6ff 50%, #cffafe 100%);
  background-attachment: fixed;
  min-height: 100vh;
  padding: 24px;
  display: flex;
  justify-content: center;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
@media (max-width: 600px) {
  /* iOS Safari performance: fixed backgrounds are expensive on mobile scroll */
  body { background-attachment: scroll; padding: 0; }
}

.app {
  position: relative;
  width: 100%;
  max-width: 480px;
  background: linear-gradient(180deg, #ffffff 0%, #f5f3ff 100%);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,0.12);
  min-height: 900px;
}
@media (max-width: 600px) {
  .app { border-radius: 0; min-height: 100vh; box-shadow: none; }
}

/* ═══ TOP BAR ═══ */
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; background: rgba(255,255,255,0.8); backdrop-filter: blur(12px); border-bottom: 0.5px solid var(--border); position: sticky; top: 0; z-index: 80; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.brand-text { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 800; letter-spacing: 2.5px; text-transform: uppercase; color: var(--ink); }
.ctrl { width: 34px; height: 34px; border-radius: 50%; border: 0.5px solid var(--border); background: #fff; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 14px; transition: all .2s; text-decoration: none; color: var(--ink); }
.ctrl:hover { transform: scale(1.08); background: #f0f9ff; }

.content { padding: 22px 22px 120px; }
.crumb { font-family: 'Montserrat', sans-serif; font-size: 10px; color: var(--ink-muted); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 8px; font-weight: 800; }
.crumb .sep { color: var(--gold); margin: 0 4px; }
.crumb a { color: var(--ink-muted); text-decoration: none; }
.crumb a:hover { color: var(--ink); }
.lesson-title { font-family: 'Montserrat', sans-serif; font-size: 28px; font-weight: 800; color: var(--ink); line-height: 1.15; margin-bottom: 6px; letter-spacing: -0.5px; }
.lesson-sub { font-size: 12px; color: var(--ink-soft); margin-bottom: 20px; font-style: italic; }

/* ═══ PROGRESS RAIL ═══ */
.progress-rail { background: #fff; border-radius: var(--radius-md); padding: 14px 16px; margin-bottom: 20px; box-shadow: 0 2px 14px rgba(0,0,0,0.04); }
.rail-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.rail-label { font-family: 'Montserrat', sans-serif; font-size: 9px; font-weight: 800; letter-spacing: 1.5px; text-transform: uppercase; color: var(--ink); }
.rail-step-count { font-family: 'Montserrat', sans-serif; font-size: 9px; font-weight: 800; color: var(--gold); letter-spacing: 1px; }
.rail-dots { display: flex; gap: 4px; }
.rail-dot { flex: 1; height: 6px; border-radius: 3px; background: var(--border); transition: all .4s; cursor: pointer; border: none; padding: 0; }
.rail-dot.done { background: var(--green); }
.rail-dot.active { background: linear-gradient(90deg, var(--green), var(--accent)); animation: railPulse 2s infinite; }
@keyframes railPulse { 0%,100% { opacity: 1; } 50% { opacity: 0.55; } }

/* ═══ STEP CARD (core unit — every step type renders inside one of these) ═══ */
.step-card { background: #fff; border-radius: var(--radius-lg); padding: 22px; box-shadow: 0 4px 24px rgba(0,0,0,0.05); margin-bottom: 16px; }
.step-kicker { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 800; letter-spacing: 2px; text-transform: uppercase; color: var(--gold); margin-bottom: 8px; }
.step-title { font-family: 'Montserrat', sans-serif; font-size: 19px; font-weight: 800; color: var(--ink); margin-bottom: 10px; letter-spacing: -0.2px; }
.step-explanation { font-size: 13.5px; color: var(--ink-soft); line-height: 1.6; margin-bottom: 16px; }

/* ═══ VIDEO / IMAGE PLACEHOLDER FRAME ═══ */
.video-frame { position: relative; width: 100%; aspect-ratio: 16/9; background: linear-gradient(135deg, #1a1d2b 0%, #374151 100%); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; overflow: hidden; margin-bottom: 14px; cursor: pointer; }
.video-frame.is-image { background: linear-gradient(135deg, #f5f3ff 0%, #ecfeff 100%); }
.video-placeholder { text-align: center; color: #fff; padding: 0 16px; }
.video-frame.is-image .video-placeholder { color: var(--ink); }
.video-icon { width: 56px; height: 56px; border-radius: 50%; background: rgba(255,255,255,0.15); backdrop-filter: blur(8px); display: flex; align-items: center; justify-content: center; margin: 0 auto 10px; font-size: 22px; transition: transform .2s; }
.video-frame.is-image .video-icon { background: rgba(26,29,43,0.08); }
.video-frame:hover .video-icon { transform: scale(1.1); background: rgba(103,232,249,0.3); }
.video-caption { font-family: 'Montserrat', sans-serif; font-size: 10px; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; font-weight: 800; }
.video-frame.is-image .video-caption { color: var(--gold); }
.video-timestamp { font-family: 'Open Sans', sans-serif; font-size: 11px; color: rgba(255,255,255,0.6); font-weight: 600; }
.video-frame.is-image .video-timestamp { color: var(--ink-muted); }
.video-frame img.placeholder-real-media { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

/* ═══ TASK / TIP / CHECK CARDS — labeled mini-blocks inside a step-card ═══ */
.mini-block { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 12px 14px; margin-bottom: 12px; border-left: 3px solid var(--border); }
.mini-block-label { font-family: 'Montserrat', sans-serif; font-size: 9.5px; font-weight: 800; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 5px; display: flex; align-items: center; gap: 6px; }
.mini-block-text { font-size: 13px; color: var(--ink-soft); line-height: 1.55; }

.task-block { background: linear-gradient(135deg, #ecfeff 0%, #f5f3ff 100%); border-left-color: var(--green); }
.task-block .mini-block-label { color: var(--green); }

.tip-block { background: linear-gradient(135deg, #f5f3ff 0%, #ecfeff 100%); border-left-color: var(--gold); }
.tip-block .mini-block-label { color: var(--gold); }

.check-block { background: #fff; border: 1.5px dashed var(--border); border-left: 3px solid var(--purple); padding: 12px 14px; border-radius: var(--radius-sm); margin-bottom: 4px; }
.check-block .mini-block-label { color: var(--purple); }
.check-block-row { display: flex; align-items: flex-start; gap: 10px; }
.check-box { flex-shrink: 0; width: 22px; height: 22px; border-radius: 7px; border: 2px solid var(--border); display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all .2s; margin-top: 1px; background: #fff; }
.check-box.checked { background: var(--green); border-color: var(--green); color: #fff; }

/* ═══ BUTTONS ═══ */
.btn-stack { display: flex; flex-direction: column; gap: 8px; margin-top: 18px; }
.btn { padding: 14px 18px; border-radius: var(--radius-md); font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 800; letter-spacing: 1.2px; text-transform: uppercase; cursor: pointer; border: none; transition: all .22s; display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; text-decoration: none; }
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover { background: #2a2f42; }
.btn-gold { background: var(--gold); color: #fff; }
.btn-gold:hover { background: #b8975e; }
.btn-ghost { background: transparent; color: var(--ink-muted); font-size: 10px; letter-spacing: 1.5px; padding: 10px; }
.btn-ghost:hover { color: var(--ink); }
@media (max-width: 600px) { .btn { padding: 15px 18px; min-height: 44px; font-size: 11px; } .btn-ghost { min-height: 36px; } }

/* ═══ COURSE OVERVIEW PAGE ═══ */
.course-hero { padding: 28px 22px 20px; }
.course-kicker { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 800; letter-spacing: 2.5px; text-transform: uppercase; color: var(--gold); margin-bottom: 10px; }
.course-title { font-family: 'Montserrat', sans-serif; font-size: 26px; font-weight: 800; color: var(--ink); line-height: 1.2; margin-bottom: 10px; letter-spacing: -0.4px; }
.course-desc { font-size: 13.5px; color: var(--ink-soft); line-height: 1.6; margin-bottom: 18px; }
.materials-strip { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 6px; }
.material-chip { display: flex; align-items: center; gap: 6px; background: #fff; border: 1px solid var(--border); border-radius: 999px; padding: 7px 12px 7px 9px; font-family: 'Montserrat', sans-serif; font-size: 10.5px; font-weight: 700; color: var(--ink-soft); }
.material-chip-icon { font-size: 13px; }

.lesson-grid { padding: 4px 22px 28px; display: flex; flex-direction: column; gap: 14px; }
.lesson-card { display: block; background: #fff; border-radius: var(--radius-lg); padding: 18px; box-shadow: 0 4px 20px rgba(0,0,0,0.05); text-decoration: none; color: var(--ink); position: relative; overflow: hidden; transition: transform .2s, box-shadow .2s; border: 1px solid var(--border); }
.lesson-card:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(0,0,0,0.09); }
.lesson-card.locked { opacity: 0.6; cursor: default; }
.lesson-card.locked:hover { transform: none; box-shadow: 0 4px 20px rgba(0,0,0,0.05); }
.lesson-card-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 10px; }
.lesson-card-number { font-family: 'Montserrat', sans-serif; font-size: 9.5px; font-weight: 800; letter-spacing: 1.5px; text-transform: uppercase; color: var(--gold); }
.lesson-card-status { font-family: 'Montserrat', sans-serif; font-size: 9px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-muted); }
.lesson-card-status.done { color: var(--green); }
.lesson-card-title { font-family: 'Montserrat', sans-serif; font-size: 16px; font-weight: 800; color: var(--ink); margin-bottom: 5px; line-height: 1.3; }
.lesson-card-desc { font-size: 12px; color: var(--ink-soft); line-height: 1.5; margin-bottom: 12px; }
.lesson-card-meta { display: flex; gap: 14px; align-items: center; }
.lesson-card-meta-item { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 700; color: var(--ink-muted); display: flex; align-items: center; gap: 5px; }
.lesson-card-progress { height: 4px; border-radius: 2px; background: var(--border); margin-top: 12px; overflow: hidden; }
.lesson-card-progress-fill { height: 100%; background: linear-gradient(90deg, var(--green), var(--accent)); border-radius: 2px; }

/* ═══ FINAL ARTWORK GOAL CARD ═══ */
.goal-card { background: linear-gradient(135deg, var(--ink) 0%, #2a2f42 100%); border-radius: var(--radius-lg); padding: 22px; margin-bottom: 16px; color: #fff; }
.goal-kicker { font-family: 'Montserrat', sans-serif; font-size: 9.5px; font-weight: 800; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }
.goal-text { font-size: 14px; line-height: 1.6; color: rgba(255,255,255,0.92); }

/* ═══ UPLOAD AREA ═══ */
.upload-drop-zone { border: 2px dashed var(--gold); cursor: pointer; }

/* ═══ REFLECTION QUESTIONS ═══ */
.reflection-list { list-style: none; display: flex; flex-direction: column; gap: 10px; margin-bottom: 4px; }
.reflection-item { display: flex; gap: 10px; align-items: flex-start; }
.reflection-q-mark { flex-shrink: 0; width: 22px; height: 22px; border-radius: 50%; background: var(--paper); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 800; color: var(--purple); margin-top: 1px; }
.reflection-text { font-size: 13px; color: var(--ink-soft); line-height: 1.55; padding-top: 2px; }
.reflection-input { width: 100%; min-height: 56px; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px; font-family: 'Open Sans', sans-serif; font-size: 13px; color: var(--ink); resize: vertical; margin-top: 6px; }
.reflection-input:focus { outline: none; border-color: var(--accent); }

/* ═══ BADGE ═══ */
.badge-unlock { display: none; text-align: center; padding: 30px 20px; }
.badge-unlock.show { display: block; animation: badgeSlideUp .6s ease; }
.badge-big { width: 110px; height: 110px; margin: 0 auto 16px; border-radius: 50%; background: linear-gradient(135deg, var(--gold) 0%, #d4af37 50%, var(--gold) 100%); display: flex; align-items: center; justify-content: center; font-size: 50px; box-shadow: 0 20px 50px rgba(200,169,110,0.5); border: 4px solid #fff; }
.badge-title { font-family: 'Montserrat', sans-serif; font-size: 20px; font-weight: 900; color: var(--ink); margin-bottom: 8px; letter-spacing: -0.5px; }
.badge-desc { font-size: 13px; color: var(--ink-soft); line-height: 1.55; margin-bottom: 20px; max-width: 280px; margin-left: auto; margin-right: auto; }
@keyframes badgeSlideUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }

/* ═══ INTERACTIVE PERSPECTIVE BLOCK (drag / animate / compare widgets) ═══ */
.ipb-wrap { margin-bottom: 14px; }
.ipb-stage { position: relative; width: 100%; border-radius: var(--radius-md); overflow: hidden; background: #dbeafe; margin-bottom: 10px; }
.ipb-svg { width: 100%; display: block; touch-action: none; }
.ipb-handle-group circle { transition: r .15s; }
.ipb-handle-group:active circle, .ipb-handle-group:hover circle { filter: drop-shadow(0 0 4px rgba(103,232,249,0.8)); }
.ipb-camera-icon { position: absolute; left: 10px; top: 42%; font-size: 22px; transform: translateY(-50%); transition: top .25s ease; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.25)); pointer-events: none; }
.ipb-readout { font-family: 'Montserrat', sans-serif; font-size: 12px; font-weight: 800; color: var(--ink); text-align: center; background: var(--paper); border-radius: var(--radius-sm); padding: 8px 10px; margin-bottom: 8px; }
.ipb-hint { font-size: 11.5px; color: var(--ink-muted); text-align: center; font-style: italic; }

.ipb-camera-row { display: flex; gap: 8px; margin-bottom: 10px; }
.ipb-cam-btn { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 10px 4px; border-radius: var(--radius-sm); border: 1.5px solid var(--border); background: #fff; font-size: 18px; cursor: pointer; transition: all .2s; }
.ipb-cam-btn span { font-family: 'Montserrat', sans-serif; font-size: 9px; font-weight: 800; letter-spacing: 0.4px; color: var(--ink-soft); text-transform: uppercase; }
.ipb-cam-btn.active { border-color: var(--accent); background: #ecfeff; }
.ipb-cam-btn.active span { color: var(--ink); }

.ipb-label-chip { position: absolute; top: 8px; left: 8px; background: rgba(26,29,43,0.85); color: #fff; font-family: 'Montserrat', sans-serif; font-size: 9.5px; font-weight: 700; letter-spacing: 0.5px; padding: 5px 10px; border-radius: 999px; }
.ipb-btn-row { display: flex; gap: 8px; margin-bottom: 8px; }
.ipb-mini-btn { flex: 1; padding: 9px 8px; border-radius: var(--radius-sm); border: none; background: var(--ink); color: #fff; font-family: 'Montserrat', sans-serif; font-size: 10.5px; font-weight: 800; letter-spacing: 0.6px; cursor: pointer; transition: background .2s; }
.ipb-mini-btn:hover { background: #2a2f42; }
.ipb-mini-btn.ipb-mini-ghost { background: #fff; color: var(--ink-soft); border: 1.5px solid var(--border); }
.ipb-mini-btn.ipb-mini-ghost:hover { color: var(--ink); }

.ipb-compare-stage { position: relative; width: 100%; aspect-ratio: 4/3; border-radius: var(--radius-md); overflow: hidden; background: linear-gradient(135deg, #f5f3ff 0%, #ecfeff 100%); margin-bottom: 10px; }
.ipb-compare-pane { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.ipb-compare-pane img { width: 100%; height: 100%; object-fit: cover; }
.ipb-compare-placeholder { display: flex; flex-direction: column; align-items: center; gap: 8px; font-size: 30px; color: var(--ink-muted); }
.ipb-compare-placeholder span { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 800; letter-spacing: 1.5px; text-transform: uppercase; }
.ipb-toggle-row { display: flex; gap: 8px; margin-bottom: 8px; }
.ipb-toggle-btn { flex: 1; padding: 9px 8px; border-radius: var(--radius-sm); border: 1.5px solid var(--border); background: #fff; color: var(--ink-soft); font-family: 'Montserrat', sans-serif; font-size: 10.5px; font-weight: 800; letter-spacing: 0.6px; cursor: pointer; transition: all .2s; }
.ipb-toggle-btn.active { background: var(--ink); color: #fff; border-color: var(--ink); }
.ipb-secondary-label { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 800; letter-spacing: 1.2px; text-transform: uppercase; color: var(--ink-muted); margin: 4px 0 8px; text-align: center; }

/* ═══ TASK CHIP (short verb instead of long Student Task paragraph) ═══ */
.task-chip-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.task-chip { display: inline-flex; align-items: center; gap: 6px; background: linear-gradient(135deg, #ecfeff 0%, #f5f3ff 100%); border: 1px solid rgba(29,158,117,0.25); color: var(--green); font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 800; letter-spacing: 0.6px; text-transform: uppercase; padding: 8px 14px; border-radius: 999px; }
.task-chip-icon { font-size: 13px; }

/* ═══ COMPACT TEACHER TIP (one line) ═══ */
.tip-block.compact { display: flex; align-items: center; gap: 8px; padding: 9px 12px; }
.tip-block.compact .mini-block-label { margin-bottom: 0; flex-shrink: 0; }
.tip-block.compact .mini-block-text { margin: 0; }

/* ═══ VISUAL CHECK (checkbox-style, replacing paragraph Check Point) ═══ */
.visual-check-row { display: flex; align-items: center; gap: 10px; background: #fff; border: 1.5px dashed var(--border); border-radius: var(--radius-sm); padding: 10px 12px; }
.visual-check-row .check-box { margin-top: 0; }
.visual-check-text { font-size: 12.5px; color: var(--ink-soft); line-height: 1.4; }

/* ═══ ARTCHI MASCOT (ported from the platform's existing lessons) ═══ */
.artchi-mascot {
  position: fixed; right: 18px; bottom: 18px;
  width: 72px; height: 72px;
  cursor: grab; z-index: 60; user-select: none;
  transition: transform .3s;
  filter: drop-shadow(0 6px 20px rgba(167,139,250,0.45));
}
.artchi-mascot:active { cursor: grabbing; }
.artchi-mascot.awake { animation: artchiBreathe 3s ease-in-out infinite; }
.artchi-mascot.excited { animation: artchiBounce .6s ease-in-out 3; }
.artchi-mascot.sleep .artchi-eye { transform: scaleY(0.1); transform-origin: center; }
.artchi-mascot.sleep::after {
  content: 'z'; position: absolute; top: -4px; right: -6px;
  font-size: 18px; color: var(--ink-muted); font-weight: 900;
  animation: artchiZzz 2s ease-in-out infinite;
  font-style: italic; font-family: 'Montserrat', sans-serif;
}
.artchi-mascot.hidden { display: none; }
.artchi-mascot.awake::before {
  content: ''; position: absolute; inset: -8px; border-radius: 50%;
  background: radial-gradient(circle, rgba(167,139,250,0.18) 0%, transparent 70%);
  z-index: -1; animation: artchiHalo 2.8s ease-in-out infinite; pointer-events: none;
}
@keyframes artchiHalo { 0%,100% { opacity: 0.5; transform: scale(1); } 50% { opacity: 0.85; transform: scale(1.1); } }
@keyframes artchiBreathe { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }
@keyframes artchiBounce { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-13px) rotate(-5deg); } }
@keyframes artchiZzz { 0%,100% { opacity: 0; transform: translateY(0); } 50% { opacity: 1; transform: translateY(-6px); } }

.artchi-bubble {
  position: fixed; right: 22px; bottom: 112px; max-width: 200px;
  background: #fff; padding: 10px 12px; border-radius: var(--radius-md);
  font-size: 12px; color: var(--ink); line-height: 1.45;
  box-shadow: 0 10px 30px rgba(0,0,0,0.15); border: 1.5px solid var(--border);
  z-index: 59; font-weight: 600; display: none;
}
.artchi-bubble::after {
  content: ''; position: absolute; bottom: -7px; right: 26px;
  width: 12px; height: 12px; background: #fff; transform: rotate(45deg);
  border-right: 1.5px solid var(--border); border-bottom: 1.5px solid var(--border);
}
.artchi-bubble.show { display: block; animation: artchiBubblePop .3s ease; }
.artchi-bubble-close { position: absolute; top: 3px; right: 7px; color: var(--ink-muted); font-size: 13px; cursor: pointer; font-weight: 800; }
@keyframes artchiBubblePop { from { opacity: 0; transform: scale(0.8); } to { opacity: 1; transform: scale(1); } }

.artchi-label {
  position: fixed; right: 22px; bottom: 4px;
  background: var(--purple); color: #fff; padding: 5px 12px; border-radius: 12px;
  font-family: 'Montserrat', sans-serif; font-size: 9.5px; font-weight: 800;
  letter-spacing: 0.6px; z-index: 61; pointer-events: none;
  box-shadow: 0 4px 14px rgba(167,139,250,0.4); white-space: nowrap;
  transition: opacity .3s ease;
}
.artchi-label.hidden { display: none; }
.artchi-label.muted { opacity: 0; visibility: hidden; }

.artchi-onboard-backdrop {
  position: fixed; inset: 0; background: rgba(15,23,42,0.55); backdrop-filter: blur(8px);
  z-index: 500; display: none; align-items: center; justify-content: center; padding: 20px;
}
.artchi-onboard-backdrop.show { display: flex; animation: artchiFadeIn .35s ease; }
.artchi-onboard-card {
  background: #fff; border-radius: var(--radius-lg); padding: 26px 22px;
  max-width: 300px; width: 100%; text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25); animation: artchiSlideUp .4s ease;
}
.artchi-onboard-svg-wrap { margin: 0 auto 12px; width: 80px; }
.artchi-onboard-title { font-family: 'Montserrat', sans-serif; font-size: 19px; font-weight: 800; color: var(--ink); margin-bottom: 6px; }
.artchi-onboard-sub { font-size: 12.5px; color: var(--ink-soft); margin-bottom: 4px; }
@keyframes artchiFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes artchiSlideUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }

/* ═══ ARTCHI CHAT (ported from Foundation A — same shell, canned replies
   instead of a real AI backend since Scene Drawing has no chat API) ═══ */
.artchi-chat {
  display: none; position: fixed; bottom: 18px; right: 18px;
  width: calc(100vw - 36px); max-width: 320px;
  background: #fff; border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.18); z-index: 200;
  overflow: hidden; border: 0.5px solid var(--border);
}
.artchi-chat.show { display: block; animation: artchiSlideUp .35s ease; }
.artchi-chat-head { padding: 14px 16px; background: linear-gradient(135deg, var(--ink) 0%, #374151 100%); color: #fff; display: flex; justify-content: space-between; align-items: center; }
.artchi-chat-head-info b { font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 800; }
.artchi-chat-head-info span { font-family: 'Montserrat', sans-serif; font-size: 9px; color: var(--accent); letter-spacing: 1px; text-transform: uppercase; display: block; margin-top: 2px; }
.artchi-chat-close { color: rgba(255,255,255,0.7); font-size: 20px; font-weight: 700; cursor: pointer; padding: 2px 8px; }
.artchi-chat-body { padding: 14px; max-height: 220px; overflow-y: auto; background: var(--paper); }
.artchi-msg { padding: 10px 12px; border-radius: var(--radius-sm); font-size: 12px; line-height: 1.5; margin-bottom: 8px; max-width: 85%; }
.artchi-msg.bot { background: #fff; color: var(--ink); border-left: 3px solid var(--accent); }
.artchi-msg.user { background: var(--ink); color: #fff; margin-left: auto; }
.artchi-chat-input-wrap { display: flex; gap: 6px; padding: 10px 12px; border-top: 0.5px solid var(--border); background: #fff; }
.artchi-chat-input { flex: 1; padding: 9px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-family: 'Open Sans', sans-serif; font-size: 12px; outline: none; }
.artchi-chat-input:focus { border-color: var(--ink); }
.artchi-chat-send { padding: 9px 12px; border-radius: var(--radius-sm); border: none; background: transparent; color: var(--ink); font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 800; cursor: pointer; letter-spacing: 1px; text-transform: uppercase; }

/* ═══ SIDE PANEL (tablet landscape + desktop only — see @media block below) ═══ */
.side-panel { display: none; }
.side-panel-title {
  font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 800;
  letter-spacing: 2px; text-transform: uppercase; color: var(--ink-muted);
  margin-bottom: 4px; text-align: center;
}
.side-artchi-preview {
  padding: 16px 14px;
  background: radial-gradient(circle, rgba(167,139,250,0.12) 0%, rgba(167,139,250,0.03) 70%);
  border-radius: var(--radius-md); border: 0.5px dashed rgba(167,139,250,0.3);
}
.side-artchi-preview-name { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 800; color: var(--ink); letter-spacing: 1px; text-align: center; }
.side-artchi-preview-sub { font-size: 10px; color: var(--ink-muted); text-align: center; margin-top: 2px; }
.side-actions { display: flex; flex-direction: column; gap: 8px; }
.side-action-btn {
  display: flex; align-items: center; gap: 10px; padding: 11px 14px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 700;
  color: var(--ink); cursor: pointer; transition: all .2s; text-align: left;
  letter-spacing: 0.3px; width: 100%;
}
.side-action-btn:hover { border-color: var(--ink); background: var(--paper); transform: translateX(2px); }
.side-action-btn-ico { font-size: 16px; }
.side-action-btn.primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.side-action-btn.primary .side-action-btn-ico { color: var(--accent); }
.side-user-info { font-size: 11px; color: var(--ink-soft); text-align: center; }

/* ═══ RESPONSIVE: SMALL TABLET (521–819px) ═══ */
@media (min-width: 521px) and (max-width: 819px) {
  body { padding: 30px 20px; }
  .app { max-width: 540px; }
  .artchi-mascot { width: 84px; height: 84px; right: 22px; bottom: 22px; }
  .artchi-chat { max-width: 360px; width: calc(100vw - 40px); }
}

/* ═══ RESPONSIVE: IPAD LANDSCAPE + DESKTOP (≥820px) — split layout,
   same breakpoint and structure as Foundation A's lessons ═══ */
@media (min-width: 820px) {
  body { padding: 30px 24px; align-items: flex-start; }
  .app { max-width: 1120px; min-height: 780px; }

  .content {
    display: grid; grid-template-columns: 1fr 320px; gap: 28px;
    padding: 24px 28px 40px; align-items: start;
  }
  .content > .course-hero, .content > .lesson-grid, .content > .step-card,
  .content > .btn, .content > #progress-rail-mount, .content > #step-content { grid-column: 1; }

  .side-panel {
    display: flex; grid-column: 2; grid-row: 1 / span 10;
    position: sticky; top: 20px;
    background: linear-gradient(180deg, #faf8ff 0%, #f5f3ff 100%);
    border-radius: var(--radius-lg); border: 0.5px solid var(--border);
    padding: 20px 18px; min-height: 480px; flex-direction: column;
    gap: 16px; box-shadow: 0 4px 24px rgba(0,0,0,0.04);
  }

  .artchi-mascot { right: 28px; bottom: 28px; width: 92px; height: 92px; z-index: 70; }
  .artchi-label { right: 28px; bottom: 10px; }
  .artchi-bubble { right: 28px; bottom: 134px; max-width: 260px; }
  .artchi-chat { right: 28px; bottom: 28px; max-width: 380px; width: calc(100vw - 56px); }
}

/* ═══ MULTIPLE CHOICE / CHECKBOX REFLECTION (replaces open-text questions) ═══ */
.mc-question-card { background: #fff; border-radius: var(--radius-lg); padding: 16px; box-shadow: 0 2px 14px rgba(0,0,0,0.05); margin-bottom: 12px; }
.mc-question-text { font-family: 'Montserrat', sans-serif; font-size: 13.5px; font-weight: 800; color: var(--ink); margin-bottom: 10px; }
.mc-options { display: flex; flex-direction: column; gap: 7px; }
.mc-option {
  display: flex; align-items: center; gap: 10px; padding: 11px 13px;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: #fff; cursor: pointer; transition: all .15s; font-size: 12.5px;
  color: var(--ink-soft); font-weight: 600;
}
.mc-option:hover { border-color: var(--accent); background: #f0fdff; }
.mc-option.selected { border-color: var(--green); background: #ecfdf5; color: var(--ink); }
.mc-option-mark {
  flex-shrink: 0; width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid var(--border); display: flex; align-items: center; justify-content: center;
  font-size: 10px; color: #fff; transition: all .15s;
}
.mc-option.selected .mc-option-mark { background: var(--green); border-color: var(--green); }
.mc-option[data-multi="true"] .mc-option-mark { border-radius: 6px; }
.mc-optional-toggle { font-size: 11px; color: var(--ink-muted); text-decoration: underline; cursor: pointer; margin-top: 8px; display: inline-block; }
.mc-optional-input { width: 100%; margin-top: 8px; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 8px 10px; font-size: 12.5px; font-family: 'Open Sans', sans-serif; display: none; }
.mc-optional-input.show { display: block; }

/* ═══ COURSE BADGE PROGRESS CARD (course-level only, not per-lesson) ═══ */
.course-badge-card { background: linear-gradient(135deg, #faf5ff 0%, #ecfeff 100%); border: 1.5px solid var(--border); border-radius: var(--radius-lg); padding: 16px; margin-bottom: 16px; }
.course-badge-row { display: flex; align-items: center; gap: 12px; }
.course-badge-emoji { font-size: 32px; flex-shrink: 0; opacity: 0.5; }
.course-badge-emoji.unlocked { opacity: 1; }
.course-badge-info { flex: 1; }
.course-badge-name { font-family: 'Montserrat', sans-serif; font-size: 12.5px; font-weight: 800; color: var(--ink); margin-bottom: 2px; }
.course-badge-meta { font-size: 11px; color: var(--ink-muted); }
.course-badge-progress-bar { height: 5px; border-radius: 3px; background: var(--border); margin-top: 10px; overflow: hidden; }
.course-badge-progress-fill { height: 100%; background: linear-gradient(90deg, var(--purple), var(--accent)); border-radius: 3px; }

/* ═══ "Added to My Journey" confirmation chip ═══ */
.journey-added-chip { display: inline-flex; align-items: center; gap: 6px; background: #f5f3ff; border: 1px solid var(--purple); color: var(--purple); font-family: 'Montserrat', sans-serif; font-size: 10.5px; font-weight: 800; padding: 7px 12px; border-radius: 999px; margin-bottom: 10px; }

/* ═══ LESSON COMPLETE CALLOUT (per-lesson — NOT a badge; the real badge is
   course-level only, see .badge-unlock) ═══ */
.lesson-complete-callout { display: none; text-align: center; padding: 22px 18px; background: #fff; border-radius: var(--radius-lg); box-shadow: 0 4px 24px rgba(0,0,0,0.05); margin-bottom: 16px; }
.lesson-complete-callout.show { display: block; animation: badgeSlideUp .5s ease; }
.lesson-complete-emoji { font-size: 36px; margin-bottom: 8px; }
.lesson-complete-title { font-family: 'Montserrat', sans-serif; font-size: 17px; font-weight: 800; color: var(--ink); margin-bottom: 6px; }
.lesson-complete-sub { font-size: 12.5px; color: var(--ink-soft); line-height: 1.5; margin-bottom: 14px; max-width: 280px; margin-left: auto; margin-right: auto; }

/* ═══ STEP TIMELINE NAV (bottom of step-by-step view) ═══ */
.step-nav { position: sticky; bottom: 0; background: rgba(255,255,255,0.92); backdrop-filter: blur(14px); border-top: 0.5px solid var(--border); padding: 14px 22px; display: flex; gap: 10px; }
.step-nav .btn { margin: 0; }
.step-nav-prev { background: #fff; color: var(--ink-soft); border: 1px solid var(--border); flex: 0 0 70px; }
.step-nav-next { flex: 1; }