:root {
  color-scheme: light;
  --brand: #006b4f;
  --brand-dark: #06483a;
  --accent: #9bdc43;
  --ink: #10211d;
  --muted: #5a6d67;
  --line: #d7e3de;
  --panel: rgba(255, 255, 255, 0.92);
  --bg: #eef5f1;
  --shadow: 0 24px 70px rgba(11, 49, 39, 0.16);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(155, 220, 67, 0.28), transparent 34rem),
    linear-gradient(135deg, #f7fbf8 0%, var(--bg) 54%, #dcebe5 100%);
}

.page-shell { width: min(1240px, calc(100vw - 32px)); margin: 0 auto; padding: 32px 0; }
.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(255,255,255,0.96), rgba(235,246,240,0.9));
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}
.eyebrow { margin: 0 0 8px; text-transform: uppercase; letter-spacing: 0.16em; font-size: 12px; font-weight: 800; color: var(--brand); }
h1 { margin: 0; font-size: clamp(34px, 5vw, 64px); line-height: 0.95; letter-spacing: -0.04em; }
.hero-copy { max-width: 720px; margin: 16px 0 0; color: var(--muted); font-size: 18px; line-height: 1.55; }
.version-pill { border: 1px solid var(--line); background: #fff; color: var(--brand-dark); padding: 8px 12px; border-radius: 999px; font-weight: 800; white-space: nowrap; }

.viewer-card { border: 1px solid var(--line); border-radius: 30px; background: var(--panel); box-shadow: var(--shadow); padding: 22px; }
.viewer-toolbar { display: flex; justify-content: space-between; gap: 18px; align-items: flex-start; margin-bottom: 18px; }
h2 { margin: 0 0 6px; font-size: 28px; letter-spacing: -0.02em; }
.muted { margin: 0; color: var(--muted); }
.upload-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-weight: 850;
  cursor: pointer;
  box-shadow: 0 12px 28px rgba(0,107,79,0.22);
}
.upload-button input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.model-switcher { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-bottom: 18px; }
.model-button {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  color: var(--ink);
  text-align: left;
  padding: 16px;
  cursor: pointer;
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}
.model-button strong { display: block; font-size: 16px; margin-bottom: 5px; }
.model-button span { color: var(--muted); }
.model-button:hover { transform: translateY(-1px); border-color: rgba(0,107,79,0.35); box-shadow: 0 12px 28px rgba(11,49,39,0.11); }
.model-button.active { border-color: var(--brand); background: linear-gradient(135deg, rgba(0,107,79,0.09), rgba(155,220,67,0.12)); box-shadow: inset 0 0 0 1px rgba(0,107,79,0.16); }

.view-settings { border: 1px solid var(--line); border-radius: 22px; background: rgba(255,255,255,0.72); margin-bottom: 18px; overflow: hidden; }
.view-settings summary { cursor: pointer; padding: 14px 16px; font-weight: 950; color: var(--brand-dark); list-style-position: inside; }
.view-settings[open] summary { border-bottom: 1px solid var(--line); }

.view-controls { display: grid; grid-template-columns: minmax(190px, 1.4fr) repeat(5, minmax(120px, 1fr)); gap: 14px; align-items: end; padding: 16px; }
.view-controls h3 { margin: 0 0 4px; font-size: 18px; }
.view-controls label { display: grid; gap: 7px; min-width: 0; font-size: 13px; font-weight: 800; color: var(--brand-dark); }
.view-controls select, .view-controls input[type="range"] { width: 100%; min-height: 42px; border: 1px solid var(--line); border-radius: 13px; background: #fff; color: var(--ink); padding: 0 10px; font: inherit; }
.view-controls input[type="range"] { padding: 0; accent-color: var(--brand); }
.view-controls em { color: var(--muted); font-size: 12px; font-style: normal; font-weight: 750; }
.toggle-control { display: flex !important; align-items: center; gap: 8px; min-height: 42px; padding: 0 10px; border: 1px solid var(--line); border-radius: 13px; background: #fff; }
.toggle-control input { width: 18px; height: 18px; accent-color: var(--brand); }

.viewer-grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 18px; align-items: stretch; }
.canvas-wrap { position: relative; overflow: hidden; min-height: 620px; border-radius: 24px; border: 1px solid var(--line); background: linear-gradient(180deg, #f9fbfa 0%, #e6efe9 100%); }
.canvas-wrap canvas { width: 100% !important; height: 100% !important; display: block; }
.placeholder { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; gap: 8px; padding: 24px; color: var(--muted); }
.placeholder strong { color: var(--ink); font-size: 20px; }

.help-panel { border: 1px solid var(--line); border-radius: 24px; background: #fff; padding: 18px; }
.help-panel h3 { margin: 0 0 12px; }
.help-panel ul { margin: 0 0 18px; padding-left: 18px; color: var(--muted); line-height: 1.55; }
.status { border: 1px solid rgba(0,107,79,0.2); background: rgba(0,107,79,0.07); border-radius: 16px; padding: 12px; color: var(--brand-dark); font-weight: 700; }
.note { color: var(--muted); font-size: 13px; line-height: 1.45; margin: 14px 0 0; }

@media (max-width: 900px) {
  .page-shell { width: min(100vw - 20px, 760px); padding: 16px 0; }
  .hero, .viewer-toolbar { flex-direction: column; }
  .hero, .viewer-card { border-radius: 22px; padding: 18px; }
  .model-switcher, .viewer-grid, .view-controls { grid-template-columns: 1fr; }
  .canvas-wrap { min-height: 460px; }
  .upload-button { width: 100%; }
}