/* ============================================================
   趣格式 GS Converter — Modern UI
   ============================================================ */

:root {
  --hue: 220;
  --bg-1: hsl(var(--hue), 60%, 96%);
  --bg-2: hsl(var(--hue), 50%, 92%);
  --glass: rgba(255,255,255,0.55);
  --glass-border: rgba(255,255,255,0.7);
  --glass-shadow: hsla(var(--hue),60%,70%,0.12);
  --text: #1e293b;
  --text-2: #475569;
  --text-3: #94a3b8;
  --accent: hsl(var(--hue), 80%, 55%);
  --accent-hover: hsl(var(--hue), 80%, 48%);
  --accent-glow: hsla(var(--hue),80%,55%,0.25);
  --success: #059669;
  --error: #dc2626;
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.25s cubic-bezier(.4,0,.2,1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(135deg, var(--bg-1), var(--bg-2));
  min-height: 100vh;
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition);
}

/* ---- Dark mode ---- */
body.dark {
  --bg-1: hsl(var(--hue), 30%, 10%);
  --bg-2: hsl(var(--hue), 25%, 8%);
  --glass: rgba(30,41,59,0.65);
  --glass-border: rgba(71,85,105,0.4);
  --glass-shadow: hsla(var(--hue),40%,20%,0.3);
  --text: #e2e8f0;
  --text-2: #94a3b8;
  --text-3: #64748b;
  --accent-glow: hsla(var(--hue),80%,55%,0.18);
}

/* ---- Layout ---- */
.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

/* ---- Header ---- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0 32px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}

.header-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-controls {
  display: flex;
  gap: 6px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  transition: all var(--transition);
  position: relative;
}
.icon-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px var(--glass-shadow); }

/* Color picker popover */
.color-popover {
  position: absolute;
  top: 44px;
  right: 0;
  background: var(--glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 14px;
  width: 200px;
  box-shadow: 0 8px 32px var(--glass-shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: all var(--transition);
  z-index: 100;
}
.color-popover.show { opacity: 1; pointer-events: auto; transform: translateY(0); }

.color-dots { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }

.color-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}
.color-dot:hover { transform: scale(1.15); }
.color-dot.active { border-color: var(--text); }

.color-dot.c-blue    { background: hsl(220,80%,55%); }
.color-dot.c-green   { background: hsl(150,70%,42%); }
.color-dot.c-orange  { background: hsl(25,90%,55%); }
.color-dot.c-pink    { background: hsl(340,75%,58%); }
.color-dot.c-purple  { background: hsl(270,65%,55%); }
.color-dot.c-teal    { background: hsl(175,70%,40%); }

.hue-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.hue-slider {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  border-radius: 3px;
  background: linear-gradient(90deg,
    hsl(0,80%,55%), hsl(60,80%,55%), hsl(120,80%,55%),
    hsl(180,80%,55%), hsl(240,80%,55%), hsl(300,80%,55%), hsl(360,80%,55%));
  outline: none;
}
.hue-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.3);
  cursor: pointer;
}

.color-reset {
  font-size: 12px;
  color: var(--text-3);
  cursor: pointer;
  text-align: center;
  padding-top: 4px;
  transition: color var(--transition);
}
.color-reset:hover { color: var(--text); }

/* ---- Hero ---- */
.hero {
  text-align: center;
  padding: 8px 0 36px;
}
.hero h1 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}
.hero p {
  font-size: 15px;
  color: var(--text-2);
}

/* ---- Tabs ---- */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  background: var(--glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 5px;
}

.tab {
  flex: 1;
  padding: 10px 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-2);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.tab:hover { color: var(--text); background: rgba(255,255,255,0.3); }
body.dark .tab:hover { background: rgba(255,255,255,0.06); }
.tab.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px var(--accent-glow);
}

/* ---- Card ---- */
.card {
  background: var(--glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 8px 32px var(--glass-shadow);
  transition: all var(--transition);
}

/* ---- Upload Zone ---- */
.upload-zone {
  border: 2px dashed var(--glass-border);
  border-radius: var(--radius);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  margin-bottom: 20px;
}
.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-glow);
}
.upload-zone.has-file {
  border-style: solid;
  border-color: var(--success);
  background: hsla(160,60%,40%,0.06);
}

.upload-icon {
  font-size: 36px;
  margin-bottom: 10px;
  opacity: 0.6;
  transition: all var(--transition);
}
.upload-zone:hover .upload-icon,
.upload-zone.dragover .upload-icon { opacity: 1; transform: translateY(-2px); }

.upload-text { font-size: 14px; color: var(--text-2); }
.upload-text strong { color: var(--accent); cursor: pointer; }
.upload-hint { font-size: 12px; color: var(--text-3); margin-top: 6px; }

.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.file-info {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
}
.file-info .name {
  font-weight: 600;
  font-size: 14px;
  max-width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-info .size {
  font-size: 13px;
  color: var(--text-3);
}
.file-remove {
  background: none;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  font-size: 16px;
  padding: 2px;
  transition: color var(--transition);
}
.file-remove:hover { color: var(--error); }

/* ---- Format Select ---- */
.form-row { margin-bottom: 18px; }

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 7px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.format-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.format-chip {
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  color: var(--text-2);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-transform: uppercase;
}
.format-chip:hover { border-color: var(--accent); color: var(--accent); }
.format-chip.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* OCR toggle */
.ocr-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 18px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: hsla(var(--hue),40%,50%,0.04);
  border: 1px solid var(--glass-border);
}
body.dark .ocr-row { background: hsla(var(--hue),30%,50%,0.08); }
.ocr-row input[type="checkbox"] {
  margin-top: 2px;
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}
.ocr-label { font-size: 13px; color: var(--text-2); line-height: 1.5; cursor: pointer; }

/* ---- Submit Button ---- */
.btn-submit {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}
.btn-submit:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 6px 20px var(--accent-glow); }
.btn-submit:active { transform: translateY(0); }
.btn-submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-submit .spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: none;
}
.btn-submit.loading .spinner { display: block; }
.btn-submit.loading .btn-text { display: none; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Result ---- */
.result {
  margin-top: 20px;
  padding: 24px;
  border-radius: var(--radius);
  text-align: center;
  animation: slideUp 0.35s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.result.success {
  background: hsla(160,60%,40%,0.06);
  border: 1px solid hsla(160,60%,40%,0.2);
}
.result.error {
  background: hsla(0,70%,50%,0.05);
  border: 1px solid hsla(0,70%,50%,0.15);
}

.result-icon { font-size: 32px; margin-bottom: 10px; }
.result-title { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.result-detail { font-size: 13px; color: var(--text-2); margin-bottom: 6px; word-break: break-all; }

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding: 12px 32px;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
}
.btn-download:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 14px var(--accent-glow); }

/* ---- Features ---- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 32px;
}
.feature {
  text-align: center;
  padding: 18px 10px;
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  transition: all var(--transition);
}
.feature:hover { transform: translateY(-2px); box-shadow: 0 6px 20px var(--glass-shadow); }
.feature-icon { font-size: 24px; margin-bottom: 6px; }
.feature-title { font-size: 14px; font-weight: 700; margin-bottom: 3px; }
.feature-desc { font-size: 12px; color: var(--text-3); }

/* ---- Footer ---- */
.footer {
  text-align: center;
  padding: 40px 0 0;
  font-size: 13px;
  color: var(--text-3);
}
.footer a {
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--transition);
}
.footer a:hover { color: var(--accent); }
.footer-links { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin-bottom: 10px; }
.footer-links a { position: relative; }
.footer-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width var(--transition);
}
.footer-links a:hover::after { width: 100%; }

/* ---- Responsive ---- */
@media (max-width: 520px) {
  .page { padding: 16px 12px 48px; }
  .hero h1 { font-size: 24px; }
  .card { padding: 20px 16px; }
  .features { grid-template-columns: 1fr; }
  .format-grid { gap: 5px; }
  .format-chip { padding: 6px 10px; font-size: 12px; }
  .upload-zone { padding: 28px 14px; }
}

/* ---- Utility ---- */
.hidden { display: none !important; }