:root {
  --bg: #f5f1eb;
  --card: rgba(255, 253, 249, 0.92);
  --card-border: rgba(44, 55, 79, 0.09);
  --text: #1a2035;
  --muted: #6b7a94;
  --accent: #5b8af5;
  --accent-soft: rgba(41, 84, 209, 0.08);
  --line: rgba(44, 55, 79, 0.07);
  --radius: 20px;
  --radius-sm: 14px;
  --shadow: 0 8px 40px rgba(22, 30, 46, 0.06);
  --font-sans: "Avenir Next", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
}

[data-theme="dark"] {
  --bg: #12141a;
  --card: rgba(24, 27, 35, 0.95);
  --card-border: rgba(255, 255, 255, 0.07);
  --text: #e2e4ea;
  --muted: #8a92a4;
  --accent: #5b8af5;
  --accent-soft: rgba(91, 138, 245, 0.12);
  --line: rgba(255, 255, 255, 0.08);
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] body {
  background: radial-gradient(ellipse at 20% 0%, rgba(91,138,245,0.06), transparent 50%), linear-gradient(160deg, #10121a 0%, #161820 50%, #12141a 100%);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; }

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--text);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(41,84,209,0.06), transparent 50%),
    linear-gradient(160deg, #eef2fb 0%, #f0ebe2 50%, #f8f6f1 100%);
}

body.app-active {
  height: 100vh;
  overflow: hidden;
}

/* ---- Landing page ---- */
.landing {
  min-height: 100vh;
  padding: 60px 20px 80px;
  overflow-y: auto;
  background:
    radial-gradient(ellipse at 30% 10%, rgba(91,138,245,0.08), transparent 60%),
    radial-gradient(ellipse at 70% 90%, rgba(194,116,92,0.06), transparent 50%),
    linear-gradient(160deg, #eef2fb 0%, #f0ebe2 50%, #f8f6f1 100%);
}
[data-theme="dark"] .landing {
  background:
    radial-gradient(ellipse at 30% 10%, rgba(91,138,245,0.08), transparent 60%),
    radial-gradient(ellipse at 70% 90%, rgba(194,116,92,0.04), transparent 50%),
    linear-gradient(160deg, #10121a 0%, #161820 50%, #12141a 100%);
}
.landing-theme-btn {
  position: fixed;
  top: 20px;
  right: 24px;
  z-index: 10;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 8px 14px;
  font: 700 1.05rem var(--font-sans);
  cursor: pointer;
  box-shadow: var(--shadow);
}
.landing-hero {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}
.qi-symbol {
  font-size: 4rem;
  line-height: 1;
  margin-bottom: 12px;
  opacity: 0.25;
  animation: qi-pulse 4s ease-in-out infinite;
}
@keyframes qi-pulse {
  0%, 100% { opacity: 0.18; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(1.08); }
}
.landing-title {
  font-family: var(--font-serif);
  font-size: 4.5rem;
  font-weight: 400;
  line-height: 1;
  color: var(--text);
  margin-bottom: 12px;
}
.landing-subtitle {
  font-size: 1.3rem;
  color: var(--muted);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}
.landing-section {
  display: flex;
  gap: 16px;
  max-width: 860px;
  margin: 0 auto 32px;
  flex-wrap: wrap;
  justify-content: center;
}
.landing-card {
  flex: 1 1 240px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 28px;
}
.landing-card-wide { flex: 1 1 100%; max-width: 860px; }
.landing-heading {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 400;
  margin-bottom: 14px;
  color: var(--text);
}
.landing-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.landing-card p {
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 10px;
  font-size: 1rem;
}
.landing-card p:last-child { margin-bottom: 0; }
.landing-card strong { color: var(--text); }
.landing-card em { font-style: italic; }
.landing-icon { font-size: 1.6rem; margin-bottom: 10px; }
.landing-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.landing-step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  font-size: 0.95rem;
  color: var(--text);
}
.step-num {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.8rem;
  flex-shrink: 0;
}
.landing-section-principles {
  flex-wrap: wrap;
  justify-content: center;
}
.landing-element {
  flex: 0 1 auto;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--card-border);
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 600;
  box-shadow: var(--shadow);
}
.landing-element span { margin-right: 4px; }
.landing-cta {
  text-align: center;
  margin-top: 48px;
}
.landing-btn {
  padding: 16px 48px;
  border: none;
  border-radius: 999px;
  font: 700 1.05rem "Space Grotesk", sans-serif;
  background: linear-gradient(135deg, var(--accent), #4e74e0);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(41,84,209,0.25);
  transition: transform 150ms ease, box-shadow 150ms ease;
}
.landing-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(41,84,209,0.35);
}
.landing-cta-hint {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--muted);
}

.landing-exit {
  animation: qi-wave-out 0.9s ease-in-out forwards;
  pointer-events: none;
}

.app-enter {
  animation: app-fade-in 0.5s ease forwards;
}

@keyframes app-fade-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes qi-wave-out {
  0% {
    clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%);
    opacity: 1;
  }
  30% {
    clip-path: polygon(
      0% 0%, 100% 0%,
      100% 60%, 85% 55%, 70% 62%, 55% 52%, 40% 60%, 25% 50%, 10% 58%, 0% 52%
    );
    opacity: 1;
  }
  60% {
    clip-path: polygon(
      0% 0%, 100% 0%,
      100% 25%, 85% 20%, 70% 28%, 55% 18%, 40% 26%, 25% 16%, 10% 24%, 0% 18%
    );
    opacity: 0.7;
  }
  100% {
    clip-path: polygon(
      0% 0%, 100% 0%,
      100% 0%, 85% 0%, 70% 0%, 55% 0%, 40% 0%, 25% 0%, 10% 0%, 0% 0%
    );
    opacity: 0;
  }
}

.app-hidden {
  position: fixed;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

/* ---- Page shell ---- */
.page-shell {
  max-width: 1680px;
  height: 100vh;
  margin: 0 auto;
  padding: 20px 28px;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 16px;
}

/* ---- Topbar ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 22px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.brand-lockup h1 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 400;
  line-height: 1;
}

.tagline {
  margin-top: 2px;
  font-size: 0.82rem;
  color: var(--muted);
}

.topbar-chips { display: flex; gap: 8px; flex-wrap: wrap; }

.chip {
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--accent-soft);
  border: 1px solid rgba(41,84,209,0.12);
  color: var(--accent);
  white-space: nowrap;
}

.chip.muted { background: rgba(0,0,0,0.03); border-color: var(--line); color: var(--muted); }
#theme-toggle { cursor: pointer; }

/* ---- App layout ---- */
.app-shell {
  display: grid;
  grid-template-columns: 400px minmax(0, 1fr);
  gap: 16px;
  min-height: 0;
}

/* ---- Cards ---- */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

/* ---- Sidebar ---- */
.sidebar {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 16px;
  min-height: 0;
}

/* Capture card */
.capture-area { margin-bottom: 16px; }

.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 32px 20px;
  border: 2px dashed rgba(41,84,209,0.2);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,0.7), rgba(241,246,255,0.5));
  cursor: pointer;
  text-align: center;
  transition: border-color 150ms ease, background 150ms ease;
}

.upload-zone:hover {
  border-color: rgba(41,84,209,0.4);
  background: linear-gradient(180deg, rgba(255,255,255,0.9), rgba(235,242,255,0.7));
}

.upload-zone input { display: none; }
.upload-icon { font-size: 1.8rem; }
.upload-title { font-weight: 700; font-size: 0.92rem; }
.upload-copy { font-size: 0.8rem; color: var(--muted); }

.viewer {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.02);
}

.room-image {
  display: block;
  width: 100%;
  max-height: 280px;
  object-fit: contain;
}

.change-image-btn {
  display: block;
  padding: 8px;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  border-top: 1px solid var(--line);
}

.change-image-btn:hover { background: var(--accent-soft); }
.change-image-btn input { display: none; }

.capture-actions { display: flex; gap: 10px; }

/* ---- Info card (tabs) ---- */
.info-card {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
  overflow: hidden;
}

.tab-bar { display: flex; gap: 4px; margin-bottom: 16px; }

.tab-btn {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 120ms ease;
}

.tab-btn:hover { background: rgba(0,0,0,0.03); color: var(--text); }

.tab-btn.is-active {
  background: var(--accent-soft);
  border-color: rgba(41,84,209,0.2);
  color: var(--accent);
}

.tab-panels { overflow: auto; min-height: 0; }
.tab-panel { display: none; }
.tab-panel.is-active { display: block; }

.info-content { display: grid; gap: 8px; color: var(--muted); line-height: 1.55; }

.metric {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--line);
}

.metric strong { display: block; color: var(--text); margin-bottom: 2px; font-size: 0.82rem; }
.metric code { font: inherit; color: var(--text); }

.guidance-list { padding-left: 16px; color: var(--muted); line-height: 1.7; }

.bagua-table { width: 100%; border-collapse: collapse; margin-top: 6px; }
.bagua-table td {
  border: 1px solid var(--line);
  padding: 6px 4px;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  background: rgba(255,255,255,0.5);
  border-radius: 4px;
}
.bagua-table td.bagua-active { background: var(--accent-soft); color: var(--accent); }
.bagua-count { font-size: 0.82rem; font-weight: 700; color: var(--text); }

/* Options form */
.opts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.opts-grid label {
  display: grid;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
}

.opts-grid input[type="number"],
.opts-grid select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  font-size: 0.85rem;
  color: var(--text);
  background: rgba(255,255,255,0.7);
}

.opt-check {
  grid-column: span 2;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
}

.opt-check input { width: 16px; height: 16px; accent-color: var(--accent); }

.canvas-hint {
  margin-top: 8px;
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
  opacity: 0.7;
}

/* Pipeline steps */
.pipeline {
  display: flex;
  gap: 2px;
  margin-top: 12px;
}

.pipe-step {
  flex: 1;
  padding: 6px 0;
  text-align: center;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  background: rgba(0,0,0,0.03);
  border-radius: 6px;
  transition: background 200ms ease, color 200ms ease;
}

.pipe-step.is-active {
  background: rgba(41,84,209,0.15);
  color: var(--accent);
}

.pipe-step.is-done {
  background: rgba(34,139,34,0.12);
  color: #228b22;
}

.opt-full { grid-column: span 2; }
.opt-hint { font-size: 0.72rem; font-weight: 400; color: var(--muted); margin-top: 2px; }
.opt-label { display: block; margin-bottom: 8px; font-size: 0.8rem; font-weight: 700; color: var(--text); }
.opening-tools {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--line);
}
.furniture-tools {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--line);
}
.toolbox-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}
.toolbox-head-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}
.marker-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 6px;
}
.furniture-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 6px;
  display: none;
}
.furniture-actions.is-active { display: grid; }
.furniture-actions .btn-sm {
  width: 100%;
}
.toolbox-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 10px;
}
.toolbox-tab {
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 120ms ease;
}
.toolbox-tab:hover { background: rgba(0,0,0,0.03); color: var(--text); }
.toolbox-tab.is-active {
  background: var(--accent-soft);
  border-color: rgba(41,84,209,0.2);
  color: var(--accent);
}

/* ---- Buttons ---- */
button { font: inherit; cursor: pointer; border: none; border-radius: 999px; font-weight: 600; transition: transform 120ms ease, opacity 120ms ease; }
button:hover:not(:disabled) { transform: translateY(-1px); }
button:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  flex: 1;
  padding: 12px 20px;
  background: linear-gradient(135deg, var(--accent), #4e74e0);
  color: #fff;
  box-shadow: 0 6px 20px rgba(41,84,209,0.2);
}

.btn-ghost {
  padding: 10px 16px;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--line);
  color: var(--text);
}

.btn-sm { padding: 7px 14px; font-size: 0.8rem; }

/* ---- Workspace / 3D preview ---- */
.workspace {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.preview-card {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  height: 100%;
  overflow: hidden;
}

.fengshui-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 10px;
  max-height: 220px;
  overflow-y: auto;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}
.fengshui-panel .fs-header {
  grid-column: span 2;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.fengshui-panel .fs-header h3 { font-size: 0.96rem; font-weight: 700; color: var(--text); }
.fengshui-panel .fs-verdict { font-size: 0.78rem; font-weight: 600; color: var(--accent); }
.fengshui-panel .fs-finding { padding: 4px 0; }
.fengshui-panel .fs-col { display: grid; gap: 2px; align-content: start; }

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.preview-header h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
}

.preview-actions { display: flex; gap: 8px; }

.preview-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.3fr);
  gap: 16px;
  min-height: 0;
}

.stage-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 0;
}

.stage-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.stage-header h3 {
  font-size: 0.96rem;
  font-weight: 700;
}

.stage-caption {
  font-size: 0.74rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.plan-canvas,
.model-canvas {
  display: block;
  width: 100%;
  min-height: 0;
  border-radius: var(--radius);
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255,255,255,0.95), transparent 50%),
    linear-gradient(180deg, #f8fafe, #eae5dc);
  border: 1px solid var(--line);
  cursor: grab;
}

.model-frame {
  position: relative;
  min-height: 0;
}

.plan-canvas {
  cursor: grab;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255,255,255,0.98), transparent 50%),
    linear-gradient(180deg, #fcfdff, #f1ede5);
}

.plan-canvas:active { cursor: grabbing; }

.model-canvas:active { cursor: grabbing; }

.compass-3d {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 66px;
  height: 66px;
  pointer-events: none;
}

.compass-3d-rose {
  position: absolute;
  inset: 0;
  transform: rotate(var(--compass-rot, 0deg));
  transform-origin: 50% 50%;
}

.compass-3d-ring {
  position: absolute;
  inset: 5px;
  border-radius: 999px;
  background: rgba(255, 253, 249, 0.86);
  border: 1px solid rgba(34, 41, 60, 0.16);
  box-shadow: 0 6px 18px rgba(22, 30, 46, 0.08);
}

.compass-3d-axis {
  position: absolute;
  background: rgba(34, 41, 60, 0.22);
}

.compass-3d-axis-v {
  top: 13px;
  bottom: 13px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.compass-3d-axis-h {
  left: 13px;
  right: 13px;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.compass-3d-needle {
  position: absolute;
  top: 12px;
  left: 50%;
  width: 0;
  height: 0;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 16px solid var(--accent);
}

.compass-3d-label {
  position: absolute;
  font-size: 0.68rem;
  font-weight: 700;
  color: rgba(22, 28, 42, 0.82);
  line-height: 1;
}

.compass-3d-n { top: -1px; left: 50%; transform: translateX(-50%); }
.compass-3d-e { right: -1px; top: 50%; transform: translateY(-50%); }
.compass-3d-s { bottom: -1px; left: 50%; transform: translateX(-50%); }
.compass-3d-w { left: -1px; top: 50%; transform: translateY(-50%); }

.compass-3d-y {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 0.68rem;
  font-weight: 700;
  color: rgba(22, 28, 42, 0.62);
}

/* ---- Dark mode overrides ---- */
[data-theme="dark"] .upload-zone {
  border-color: rgba(91,138,245,0.2);
  background: linear-gradient(180deg, rgba(24,27,35,0.7), rgba(20,22,30,0.5));
}
[data-theme="dark"] .upload-zone:hover {
  border-color: rgba(91,138,245,0.4);
  background: linear-gradient(180deg, rgba(30,33,42,0.9), rgba(24,27,35,0.7));
}
[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, #4a78e0, #5b8af5);
  box-shadow: 0 6px 20px rgba(91,138,245,0.2);
}
[data-theme="dark"] .btn-ghost {
  background: rgba(255,255,255,0.04);
  color: var(--text);
}
[data-theme="dark"] .plan-canvas,
[data-theme="dark"] .model-canvas {
  background: linear-gradient(180deg, #1a1d26, #14161e);
}
[data-theme="dark"] .metric {
  background: rgba(255,255,255,0.03);
}
[data-theme="dark"] .opts-grid input[type="number"],
[data-theme="dark"] .opts-grid select {
  background: rgba(255,255,255,0.05);
  color: var(--text);
  border-color: var(--line);
}
[data-theme="dark"] .opening-tools,
[data-theme="dark"] .furniture-tools {
  background: rgba(255,255,255,0.03);
}
[data-theme="dark"] .viewer {
  background: rgba(255,255,255,0.03);
}
[data-theme="dark"] .compass-3d-ring {
  background: rgba(24, 27, 35, 0.86);
  border-color: rgba(255,255,255,0.12);
}
[data-theme="dark"] .compass-3d-label { color: rgba(226,228,234,0.82); }
[data-theme="dark"] .compass-3d-axis { background: rgba(255,255,255,0.15); }
[data-theme="dark"] .bagua-table td { background: rgba(255,255,255,0.03); color: var(--muted); }
[data-theme="dark"] .bagua-table td.bagua-active { background: var(--accent-soft); color: var(--accent); }
[data-theme="dark"] .change-image-btn { color: var(--accent); border-top-color: var(--line); }
[data-theme="dark"] .change-image-btn:hover { background: var(--accent-soft); }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  body, .page-shell { height: auto; overflow: auto; }
  .app-shell { grid-template-columns: 1fr; }
  .preview-card { height: auto; min-height: 50vh; }
  .preview-grid { grid-template-columns: 1fr; }
  .opts-grid { grid-template-columns: 1fr; }
  .room-image { max-height: 220px; }
}