/* === Theme variables（与 codec / qrcode 同款，方便主题切换同步） === */
:root {
  color-scheme: light;
  --bg: #f5f3ef;
  --bg-deep: #ebe7df;
  --card: #fffdfa;
  --card-soft: #faf8f4;
  --text: #252524;
  --muted: #8b8984;
  --line: #e9e5de;
  --accent: #6572c7;
  --accent-soft: #eef0ff;
  --green: #4e9b7b;
  --warn: #c87a3a;
  --error: #c8443a;
  --shadow: 0 18px 55px rgba(75, 65, 50, 0.08);
  --radius: 22px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Noto Sans SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Cascadia Code", monospace;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1d1e24;
  --bg-deep: #17181d;
  --card: #282930;
  --card-soft: #24252b;
  --text: #f1f0ec;
  --muted: #a1a0a0;
  --line: #3b3c44;
  --accent: #9ca7ff;
  --accent-soft: #30334b;
  --green: #79c3a1;
  --warn: #e0a264;
  --error: #e57872;
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.18);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font);
  background: radial-gradient(circle at 4% 0%, rgba(218, 211, 193, 0.38), transparent 34%), var(--bg);
  transition: background 0.25s, color 0.25s;
}
body[data-theme="dark"] {
  background: radial-gradient(circle at 4% 0%, rgba(60, 80, 140, 0.22), transparent 36%), var(--bg);
}
button, input { font: inherit; }
button { cursor: pointer; }
.ambient { position: fixed; pointer-events: none; filter: blur(60px); opacity: 0.35; border-radius: 50%; z-index: -1; }
.ambient-one { width: 260px; height: 260px; background: #dfe4ff; top: 9%; right: 8%; }
.ambient-two { width: 220px; height: 220px; background: #f3ddca; bottom: 4%; left: 3%; }
body[data-theme="dark"] .ambient-one { background: #3e4a8a; opacity: 0.55; }
body[data-theme="dark"] .ambient-two { background: #5a3a30; opacity: 0.45; }

/* === Topbar === */
.topbar {
  height: 72px;
  padding: 0 clamp(20px, 4vw, 64px);
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px);
  position: sticky; top: 0; z-index: 5;
}
.back-link, .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-size: 14px; }
.back-link { color: var(--muted); transition: color 0.2s; }
.back-link:hover { color: var(--accent); }
.brand { position: absolute; left: 50%; transform: translateX(-50%); font-weight: 700; letter-spacing: 0.01em; }
.brand-mark { color: var(--accent); font-size: 20px; }
.beta {
  border: 1px solid var(--line); border-radius: 99px;
  padding: 4px 7px; font-size: 8px; font-family: var(--mono);
  font-weight: 600; color: var(--muted);
}
.top-actions { display: flex; align-items: center; gap: 8px; }
.icon-button {
  border: 1px solid var(--line); background: var(--card); color: var(--muted);
  border-radius: 10px; width: 36px; height: 36px;
  transition: color 0.2s, border-color 0.2s;
}
.icon-button:hover { color: var(--accent); border-color: var(--accent); }

/* === Layout === */
.app-shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 48px 0 45px; }
.intro-row { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 34px; gap: 20px; }
.eyebrow { color: var(--accent); font-size: 10px; letter-spacing: 0.16em; font-weight: 700; margin: 0 0 12px; }
.intro-row h1 { font-size: clamp(32px, 4vw, 52px); line-height: 1.12; letter-spacing: -0.05em; margin: 0; font-weight: 700; }
.intro-row h1 em { color: var(--accent); font-style: normal; }
.intro-copy { color: var(--muted); font-size: 15px; margin: 15px 0 0; line-height: 1.7; max-width: 60ch; }
.privacy-note { color: var(--green); display: flex; gap: 10px; align-items: flex-start; font-size: 12px; line-height: 1.5; padding-bottom: 4px; flex-shrink: 0; }
.privacy-note small { color: var(--muted); }
.privacy-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--green);
  display: inline-block; margin-top: 5px;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--green) 12%, transparent);
  flex-shrink: 0;
}

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel { overflow: hidden; margin-bottom: 18px; }
.surface-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 22px; border-bottom: 1px solid var(--line); gap: 12px; flex-wrap: wrap;
}
.surface-title h2 { font-size: 17px; margin: 6px 0 0; letter-spacing: -0.02em; }
.surface-title .label { font-size: 10px; letter-spacing: 0.16em; color: var(--muted); font-weight: 700; }
.surface-actions { display: flex; align-items: center; gap: 8px; }
.text-button {
  border: 0; background: transparent; color: var(--muted);
  padding: 6px 10px; font-size: 12px; border-radius: 8px; font-family: var(--font);
  transition: background 0.2s, color 0.2s;
}
.text-button:hover:not([disabled]) { background: var(--card-soft); color: var(--text); }
.text-button[disabled] { opacity: 0.4; cursor: not-allowed; }

/* === Dropzone === */
/* 视觉隐藏但保留可聚焦（不用 hidden 属性），键盘与读屏仍能到达文件输入 */
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.dropzone {
  position: relative;
  display: flex; align-items: center; justify-content: center;
  padding: 34px 24px; margin-bottom: 18px; min-height: 180px;
  border: 1.5px dashed var(--line); cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--accent); background: var(--accent-soft); outline: none; }
.dropzone.is-drag { border-color: var(--accent); background: var(--accent-soft); }
.dropzone.has-files { min-height: 0; padding: 18px 24px; justify-content: flex-start; }
.drop-empty { display: flex; flex-direction: column; align-items: center; gap: 6px; color: var(--muted); }
.drop-icon { font-size: 30px; opacity: 0.7; }
.drop-title { font-size: 14px; font-weight: 600; color: var(--text); }
.drop-hint { font-size: 11.5px; }

/* === Options === */
.options { padding: 8px 22px 22px; display: flex; flex-direction: column; gap: 18px; }
.option-row { display: flex; flex-direction: column; gap: 8px; }
.option-label {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 600; color: var(--text);
}
.opt-icon { font-size: 16px; opacity: 0.8; width: 18px; text-align: center; }
.opt-value { margin-left: auto; font-family: var(--mono); font-size: 12px; color: var(--accent); font-weight: 500; }
.option-hint { margin: 4px 0 0; font-size: 11px; color: var(--muted); line-height: 1.5; }
.option-hint.is-warn { color: var(--warn); }

.seg-control {
  display: inline-flex; flex-wrap: wrap; gap: 4px;
  background: var(--card-soft); border: 1px solid var(--line);
  border-radius: 12px; padding: 4px; align-self: flex-start;
}
.seg {
  border: 0; background: transparent; color: var(--muted);
  padding: 7px 16px; border-radius: 8px;
  font-size: 12px; font-weight: 500; font-family: var(--font);
  transition: background 0.2s, color 0.2s;
}
.seg:hover { color: var(--text); }
.seg.is-active { background: var(--accent); color: #fff; box-shadow: 0 2px 6px color-mix(in srgb, var(--accent) 30%, transparent); }
.seg[disabled] { opacity: 0.4; cursor: not-allowed; }

.slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 6px; border-radius: 99px;
  background: var(--line); outline: none;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  border: 3px solid var(--card); box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  transition: transform 0.15s;
}
.slider::-webkit-slider-thumb:hover { transform: scale(1.1); }
.slider::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); cursor: pointer; border: 3px solid var(--card);
}

.dim-input {
  border: 1px solid var(--line); background: var(--card-soft); color: var(--text);
  border-radius: 12px; padding: 11px 15px; font-size: 13px;
  font-family: var(--mono); outline: 0; width: 100%; max-width: 320px;
  transition: border-color 0.2s;
}
.dim-input:focus { border-color: var(--accent); }
.dim-input.is-error { border-color: var(--error); }

/* === Summary === */
.summary {
  display: flex; align-items: center; justify-content: center;
  flex-wrap: wrap; gap: 10px 26px;
  padding: 20px 24px; margin-bottom: 18px;
}
.summary[hidden] { display: none; }
.summary-item { display: flex; align-items: baseline; gap: 7px; }
.summary-label { font-size: 11.5px; color: var(--muted); }
.summary-value { font-family: var(--mono); font-size: 20px; font-weight: 700; letter-spacing: -0.02em; }
.summary-value.is-accent { color: var(--accent); }
.summary-value.is-green { color: var(--green); }
.summary-value.is-warn { color: var(--warn); }
.summary-unit { font-size: 11.5px; color: var(--muted); }
.summary-arrow { color: var(--muted); font-size: 16px; }

/* === Results === */
.results-panel[hidden] { display: none; }
.result-list { display: flex; flex-direction: column; }
.result-item {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) auto;
  gap: 18px; align-items: center;
  padding: 18px 22px; border-bottom: 1px solid var(--line);
}
.result-item:last-child { border-bottom: 0; }
@media (max-width: 700px) {
  .result-item { grid-template-columns: 68px minmax(0, 1fr); gap: 14px; }
  .result-actions { grid-column: 1 / -1; justify-content: flex-start; }
}
.result-thumb {
  width: 92px; height: 92px; border-radius: 12px; overflow: hidden;
  background:
    repeating-conic-gradient(var(--card-soft) 0% 25%, var(--line) 0% 50%) 50% / 14px 14px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line);
}
.result-thumb img { width: 100%; height: 100%; object-fit: contain; display: block; }
@media (max-width: 700px) { .result-thumb { width: 68px; height: 68px; } }

.result-info { min-width: 0; display: flex; flex-direction: column; gap: 7px; }
.result-name {
  font-size: 13.5px; font-weight: 600; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.result-stats {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px;
  font-family: var(--mono); font-size: 12px; color: var(--muted);
}
.result-stats b { color: var(--text); font-weight: 600; }
.badge {
  font-size: 11px; border-radius: 99px; padding: 3px 9px;
  background: var(--green); color: #fff; font-weight: 600;
}
.badge.is-warn { background: var(--warn); }
.badge.is-error { background: var(--error); }
.badge.is-neutral { background: var(--card-soft); color: var(--muted); }
.result-err { font-size: 12px; color: var(--error); line-height: 1.5; }
.result-actions { display: flex; align-items: center; gap: 8px; }
.dl-btn {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--accent); color: #fff; border: 0;
  padding: 10px 16px; border-radius: 11px;
  font-size: 12.5px; font-weight: 600; font-family: var(--font);
  white-space: nowrap;
  transition: transform 0.15s, box-shadow 0.2s;
}
.dl-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 30%, transparent); }

.global-error {
  color: var(--error); font-size: 13px; line-height: 1.6;
  background: color-mix(in srgb, var(--error) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--error) 28%, transparent);
  border-radius: 14px; padding: 14px 18px; margin: 0;
}
.global-error[hidden] { display: none; }

/* === Toast === */
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%);
  background: var(--text); color: var(--bg);
  padding: 11px 22px; border-radius: 99px; font-size: 13px; font-weight: 600;
  z-index: 100; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
  animation: toast-in 0.2s ease-out;
}
.toast[hidden] { display: none; }
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

@media (max-width: 600px) {
  .app-shell { padding: 30px 0 36px; width: calc(100% - 24px); }
  .intro-row { flex-direction: column; align-items: flex-start; gap: 14px; }
  .surface-toolbar, .options, .result-item { padding-left: 18px; padding-right: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}