/* SoftSketch marketing — cream #FFF8F0 · cocoa #4A3B3B */
:root {
  --cream: #FFF8F0;
  --cream-deep: #F5EDE3;
  --cocoa: #4A3B3B;
  --cocoa-soft: #6B5555;
  --blush: #F2B8B5;
  --blush-deep: #E89A96;
  --mint: #B8D4C8;
  --chalk-green: #2D4A3E;
  --chalk-board: #1E3329;
  --white: #FFFFFF;
  --shadow: rgba(74, 59, 59, 0.12);
  --radius: 20px;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --max: 1080px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--cream);
  color: var(--cocoa);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--cocoa); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--blush-deep); }
.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 248, 240, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(74, 59, 59, 0.08);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.85rem 0;
}
.brand {
  display: flex; align-items: center; gap: 0.65rem;
  text-decoration: none; color: var(--cocoa); font-weight: 700;
}
.brand img { width: 40px; height: 40px; border-radius: 10px; box-shadow: 0 0 0 1px rgba(74,59,59,0.08); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text .zh { font-size: 1.05rem; }
.brand-text .en { font-size: 0.72rem; font-weight: 500; color: var(--cocoa-soft); letter-spacing: 0.02em; }
.nav-links { display: flex; align-items: center; gap: 0.35rem 1rem; flex-wrap: wrap; }
.nav-links a {
  text-decoration: none; font-size: 0.92rem; font-weight: 600;
  padding: 0.35rem 0.55rem; border-radius: 999px;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { background: var(--cream-deep); }
.lang-toggle {
  border: 1.5px solid var(--cocoa);
  background: var(--white);
  color: var(--cocoa);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font: inherit; font-size: 0.85rem; font-weight: 700;
  cursor: pointer;
}
.lang-toggle:hover { background: var(--cocoa); color: var(--cream); }

/* Hero */
.hero {
  padding: 2.5rem 0 3rem;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--cream-deep);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
  font-size: 0.82rem; font-weight: 600;
  color: var(--cocoa-soft);
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(1.85rem, 4.5vw, 2.75rem);
  line-height: 1.25; margin: 0 0 1rem;
  letter-spacing: -0.02em;
}
.hero .lead {
  font-size: 1.08rem; color: var(--cocoa-soft);
  margin: 0 0 1.75rem; max-width: 36em;
}
.hero-art {
  display: flex; justify-content: center; align-items: center;
  position: relative;
}
.hero-art img {
  width: min(100%, 420px);
  filter: drop-shadow(0 18px 40px rgba(74,59,59,0.18));
}
.hero-blob {
  position: absolute; inset: 12% 8%;
  background: radial-gradient(circle at 40% 40%, var(--blush) 0%, transparent 65%);
  opacity: 0.45; z-index: -1; border-radius: 50%;
}

.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.45rem;
  border-radius: 14px; padding: 0.85rem 1.25rem;
  font: inherit; font-weight: 700; font-size: 0.95rem;
  text-decoration: none; border: none; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--cocoa); color: var(--cream);
  box-shadow: 0 8px 20px rgba(74,59,59,0.22);
}
.btn-primary:hover { color: var(--cream); }
.btn-secondary {
  background: var(--white); color: var(--cocoa);
  border: 1.5px solid rgba(74,59,59,0.2);
}
.btn-store {
  background: var(--cocoa); color: var(--cream);
  opacity: 0.55; cursor: not-allowed;
  min-width: 168px; flex-direction: column; align-items: flex-start;
  padding: 0.65rem 1.1rem; gap: 0.1rem; line-height: 1.2;
}
.btn-store .store-label { font-size: 0.68rem; font-weight: 500; opacity: 0.85; }
.btn-store .store-name { font-size: 1rem; }
.btn-store[aria-disabled="true"] { pointer-events: none; }

/* Sections */
.section { padding: 3rem 0; }
.section-alt { background: var(--cream-deep); }
.section h2 {
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  margin: 0 0 0.5rem; letter-spacing: -0.01em;
}
.section .section-lead {
  color: var(--cocoa-soft); margin: 0 0 2rem; max-width: 40em;
}
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.1rem;
}
.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.35rem 1.25rem;
  box-shadow: 0 4px 18px var(--shadow);
  border: 1px solid rgba(74,59,59,0.06);
}
.feature-icon {
  width: 48px; height: 48px; border-radius: 14px;
  background: var(--cream-deep);
  display: grid; place-items: center;
  font-size: 1.4rem; margin-bottom: 0.85rem;
}
.feature-card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.feature-card p { margin: 0; font-size: 0.92rem; color: var(--cocoa-soft); }

.pro-banner {
  margin-top: 1.5rem;
  background: linear-gradient(135deg, #4A3B3B 0%, #6B5555 100%);
  color: var(--cream);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
  display: grid; gap: 0.75rem;
}
.pro-banner h3 { margin: 0; font-size: 1.15rem; }
.pro-banner p { margin: 0; opacity: 0.9; font-size: 0.95rem; }
.pro-chips { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.pro-chips span {
  background: rgba(255,248,240,0.15);
  border: 1px solid rgba(255,248,240,0.25);
  border-radius: 999px; padding: 0.25rem 0.75rem; font-size: 0.82rem;
}

/* Demo teaser */
.demo-teaser {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center;
}
.demo-preview {
  background: var(--chalk-board);
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  display: grid; place-items: center;
  color: rgba(255,255,255,0.75);
  font-size: 1.1rem; font-weight: 600;
  box-shadow: inset 0 0 60px rgba(0,0,0,0.35), 0 12px 32px rgba(30,51,41,0.35);
  position: relative; overflow: hidden;
  border: 10px solid #3d2a1e;
}
.demo-preview::before {
  content: ""; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.15'/%3E%3C/svg%3E");
  opacity: 0.4; pointer-events: none;
}
.chalk-sample {
  position: relative; z-index: 1;
  font-family: "Comic Sans MS", "Segoe Print", cursive;
  letter-spacing: 0.04em;
  text-shadow: 0 0 2px rgba(255,255,255,0.4);
}

/* Legal pages */
.legal {
  padding: 2.5rem 0 4rem;
  max-width: 720px;
}
.legal h1 { font-size: clamp(1.6rem, 3vw, 2.1rem); margin: 0 0 0.35rem; }
.legal .meta { color: var(--cocoa-soft); font-size: 0.9rem; margin-bottom: 2rem; }
.legal h2 { font-size: 1.2rem; margin: 2rem 0 0.6rem; }
.legal h3 { font-size: 1.05rem; margin: 1.25rem 0 0.4rem; }
.legal p, .legal li { color: var(--cocoa-soft); }
.legal ul { padding-left: 1.25rem; }
.legal .lang-block { display: none; }
.legal .lang-block.active { display: block; }
.note-box {
  background: var(--cream-deep);
  border-left: 4px solid var(--blush);
  padding: 0.9rem 1rem;
  border-radius: 0 12px 12px 0;
  margin: 1.25rem 0;
  font-size: 0.92rem;
}

/* Demo page */
.demo-page { padding: 1.5rem 0 3rem; }
.demo-page h1 { margin: 0 0 0.35rem; font-size: clamp(1.5rem, 3vw, 2rem); }
.demo-note {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: #E8F5EE; color: #1E4D3A;
  border-radius: 999px; padding: 0.4rem 0.9rem;
  font-size: 0.85rem; font-weight: 600; margin: 0.75rem 0 1.25rem;
}
.board-wrap {
  background: #3d2a1e;
  border-radius: 16px;
  padding: 12px;
  box-shadow: 0 16px 40px rgba(61,42,30,0.35);
}
.board-frame {
  background: var(--chalk-board);
  border-radius: 8px;
  position: relative;
  overflow: hidden;
  touch-action: none;
}
#chalkCanvas {
  display: block; width: 100%; height: auto;
  cursor: crosshair;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255,255,255,0.03), transparent 50%),
    linear-gradient(180deg, #243d32 0%, #1a2e25 100%);
}
.toolbar {
  display: flex; flex-wrap: wrap; gap: 0.65rem;
  align-items: center; justify-content: space-between;
  margin-top: 0.9rem; padding: 0.25rem 0.15rem;
}
.tool-group { display: flex; flex-wrap: wrap; gap: 0.45rem; align-items: center; }
.swatch {
  width: 36px; height: 36px; border-radius: 50%;
  border: 3px solid transparent; cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.15);
}
.swatch[aria-pressed="true"] {
  border-color: var(--cream);
  outline: 2px solid var(--cocoa);
  outline-offset: 1px;
}
.swatch-white { background: #F5F5F0; }
.swatch-yellow { background: #F5E6A3; }
.swatch-pink { background: #F5C0C8; }
.swatch-blue { background: #A8D4E8; }
.tool-btn {
  background: var(--cream); color: var(--cocoa);
  border: 1.5px solid rgba(255,248,240,0.3);
  border-radius: 10px; padding: 0.5rem 0.85rem;
  font: inherit; font-size: 0.85rem; font-weight: 700; cursor: pointer;
}
.tool-btn[aria-pressed="true"] { background: var(--blush); border-color: var(--blush-deep); }
.tool-btn.danger:hover { background: #fde8e8; }
.size-control { display: flex; align-items: center; gap: 0.45rem; color: var(--cream); font-size: 0.85rem; }
.size-control input[type="range"] { width: 100px; accent-color: var(--blush); }

/* Footer */
.site-footer {
  border-top: 1px solid rgba(74,59,59,0.1);
  padding: 2rem 0 2.5rem;
  margin-top: 1rem;
  background: var(--cream-deep);
}
.footer-grid {
  display: flex; flex-wrap: wrap; gap: 1.5rem;
  justify-content: space-between; align-items: flex-start;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; }
.footer-links a { text-decoration: none; font-weight: 600; font-size: 0.92rem; }
.footer-meta { font-size: 0.85rem; color: var(--cocoa-soft); }
.footer-meta p { margin: 0.2rem 0; }

/* i18n visibility */
[data-i18n-hide] { display: none !important; }
html[lang="zh-Hant"] .only-en,
html[lang="en"] .only-zh { display: none !important; }

@media (max-width: 800px) {
  .hero, .demo-teaser { grid-template-columns: 1fr; }
  .hero { padding-top: 1.5rem; text-align: center; }
  .hero .lead { margin-inline: auto; }
  .cta-row { justify-content: center; }
  .hero-art { order: -1; }
  .hero-art img { width: min(100%, 280px); }
  .nav-links a:not(.lang-toggle) { display: none; }
  .nav-links a.nav-demo { display: inline-flex; }
}