/* WhiteBay — 極簡白＋黑字（Amazon 感） */
:root {
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --card: #ffffff;
  --ink: #0f1111;
  --muted: #565959;
  --line: #d5d9d9;
  --line-strong: #888c8c;
  --cta: #0f1111;
  --cta-hover: #232f3e;
  --danger: #b12704;
  --radius: 4px;
  font-family: "Amazon Ember", "PingFang TC", "Noto Sans TC", "Helvetica Neue", Arial, "Microsoft JhengHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
input, button, textarea { font-family: inherit; }
.wrap { width: min(980px, calc(100% - 2.5rem)); margin-inline: auto; }
.muted { color: var(--muted); font-size: 0.92rem; }
.hidden { display: none !important; }
code {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 0.1em 0.35em;
  border-radius: 2px;
  font-size: 0.9em;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  gap: 1rem;
}
.logo {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo span { color: var(--muted); font-weight: 500; margin-left: 0.15em; }
nav { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; }
nav a { color: var(--ink); font-size: 0.92rem; text-decoration: none; }
nav a:hover { text-decoration: underline; }
nav a.btn { text-decoration: none !important; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid var(--cta);
  border-radius: var(--radius);
  background: var(--cta);
  color: #fff !important;
  font-weight: 600;
  padding: 0.65rem 1.15rem;
  cursor: pointer;
  text-decoration: none !important;
  font-size: 0.95rem;
}
.btn:hover { background: var(--cta-hover); border-color: var(--cta-hover); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.btn-sm { padding: 0.4rem 0.85rem; font-size: 0.85rem; }
.btn-ghost {
  background: #fff;
  color: var(--ink) !important;
  border: 1px solid var(--line-strong);
}
.btn-ghost:hover {
  background: var(--bg-soft);
  border-color: var(--ink);
  color: var(--ink) !important;
}

.hero { padding: 3.5rem 0 2rem; }
.eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--ink);
  max-width: 18em;
}
.lead {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 36rem;
  margin: 0;
  line-height: 1.6;
}
.hero-cta { display: flex; gap: 0.75rem; flex-wrap: wrap; margin: 1.75rem 0 1rem; }
.en-sub { color: var(--muted); font-size: 0.85rem; margin: 0; }

.demos {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 0.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}
.demos figure {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: none;
}
.demos img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 2 / 1;
  object-fit: contain;
  background: #fff;
}
.demos figcaption {
  padding: 0.55rem 0.7rem;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.section { padding: 2.75rem 0; }
.section h2 {
  margin: 0 0 1.25rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.steps {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.55rem;
}

.try .panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: none;
}
.usage {
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
}
.mode-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.15rem; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.5rem 0.95rem;
  cursor: pointer;
  background: #fff;
  user-select: none;
  color: var(--ink);
  font-size: 0.92rem;
}
.chip:hover { border-color: var(--line-strong); }
.chip:has(input:checked) {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
  font-weight: 600;
}
.chip input { accent-color: var(--ink); }

.drop {
  display: block;
  border: 1px dashed var(--line-strong);
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 2.75rem 1.25rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}
.drop:hover { border-color: var(--ink); background: #fff; }
.drop.dragover {
  border-style: solid;
  border-color: var(--ink);
  background: #fff;
}
.drop-title { display: block; font-weight: 600; font-size: 1rem; color: var(--ink); }
.drop-hint { display: block; color: var(--muted); font-size: 0.85rem; margin-top: 0.4rem; }

.file-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}
.file-list li {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.5rem 0.7rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.9rem;
}
.file-list li:hover { border-color: var(--line-strong); }
.file-list .size { color: var(--muted); white-space: nowrap; }

.actions { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 1.15rem; }

.progress { margin-top: 1.15rem; }
.bar {
  height: 4px;
  background: var(--line);
  border-radius: 0;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  width: 0%;
  background: var(--ink);
  transition: width 0.25s ease;
}
#progressMsg { margin: 0.55rem 0 0; color: var(--muted); font-size: 0.9rem; }

.results { margin-top: 1.35rem; }
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.6rem;
  margin: 0.85rem 0 1.1rem;
}
.preview-grid figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}
.preview-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: #fff;
  display: block;
}
.preview-grid figcaption {
  font-size: 0.72rem;
  padding: 0.35rem 0.45rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-top: 1px solid var(--line);
}

.error {
  margin-top: 0.9rem;
  color: var(--danger);
  background: #fff;
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  padding: 0.7rem 0.85rem;
  font-size: 0.92rem;
}

.price-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}
.price-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1rem;
}
.price-card.featured {
  border-color: var(--ink);
  border-width: 2px;
  box-shadow: none;
}
.price-card h3 { margin: 0 0 0.4rem; font-size: 0.95rem; font-weight: 600; }
.price {
  margin: 0 0 0.4rem;
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.price span { font-size: 0.8rem; font-weight: 500; color: var(--muted); }
.price-card p:last-child { margin: 0; color: var(--muted); font-size: 0.88rem; }

.privacy p { margin: 0; max-width: 40rem; }

.wait-panel { max-width: 28rem; margin: 1.25rem 0 0; }
.wait-panel label {
  display: block;
  margin: 0.85rem 0 0.3rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.wait-panel input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 1rem;
  background: #fff;
  color: var(--ink);
}
.wait-panel input:focus {
  outline: 2px solid var(--ink);
  outline-offset: 1px;
}
.wait-panel .btn { margin-top: 1rem; }
.wait-note { margin: 0.75rem 0 0; color: var(--muted); font-size: 0.85rem; }
.wait-ok {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg-soft);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
}
.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.foot {
  border-top: 1px solid var(--line);
  padding: 1.75rem 0 2.75rem;
  margin-top: 0.5rem;
  background: var(--bg-soft);
}
.foot p { margin: 0.2rem 0; font-size: 0.9rem; }

@media (max-width: 800px) {
  .demos { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: 1fr 1fr; }
  .hero { padding: 2.25rem 0 1.5rem; }
  .section { padding: 2rem 0; }
  .wrap { width: min(980px, calc(100% - 1.5rem)); }
  .brand-row { flex-wrap: wrap; }
  nav { gap: 0.85rem; }
}
@media (max-width: 520px) {
  .price-grid { grid-template-columns: 1fr; }
}