/**
 * style.css — audiogram-gen styles. Colors come from the design tokens only.
 * Motion is limited to opacity/transform at 150-250ms; no horizontal scroll at 375px;
 * tap targets are at least 44x44px and focus is always visible.
 */

:root {
  --color-bg: #0f0f1a;
  --color-surface: #1a1a2e;
  --color-surface-raised: #222240;
  --color-primary: #6366f1;
  --color-primary-hover: #818cf8;
  --color-text-primary: #ffffff;
  --color-text-secondary: #a0a0b0;
  --color-text-muted: #6b6b7b;
  --color-error: #ef4444;
  --color-success: #22c55e;
  --color-border: #31314f;
  --border-radius: 8px;
  --spacing-unit: 8px;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-xxl: 32px;
  --transition: 200ms ease-out;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: var(--font-size-md);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main, header, footer, section { max-width: 1200px; margin: 0 auto; padding: 0 calc(var(--spacing-unit) * 3); }

a { color: var(--color-primary-hover); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--color-primary-hover);
  outline-offset: 2px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--color-primary); color: #fff;
  padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
  z-index: 200; border-radius: 0 0 var(--border-radius) 0;
}
.skip-link:focus { left: 0; }

/* ================= Header ================= */
.site-header { padding-top: calc(var(--spacing-unit) * 4); }

.site-header h1 {
  font-size: var(--font-size-xxl);
  margin: 0 0 calc(var(--spacing-unit) * 1);
  letter-spacing: -0.5px;
}

.tagline { color: var(--color-text-secondary); margin: 0 0 calc(var(--spacing-unit) * 2); }

.badge-privacy {
  display: inline-block;
  background: rgba(34, 197, 94, 0.12);
  color: var(--color-success);
  border: 1px solid rgba(34, 197, 94, 0.35);
  border-radius: 999px;
  padding: 2px 12px;
  font-size: var(--font-size-sm);
}

.workbench {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: calc(var(--spacing-unit) * 4);
  align-items: start;
  margin-top: calc(var(--spacing-unit) * 3);
}

.workbench__preview { min-width: 0; }
.workbench__panel { min-width: 0; }

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: calc(var(--spacing-unit) * 3);
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.panel h2 {
  font-size: var(--font-size-lg);
  margin: 0 0 calc(var(--spacing-unit) * 2);
}

.panel .hint { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin: calc(var(--spacing-unit) * 1) 0 0; }

.dropzone {
  position: relative;
  border: 2px dashed var(--color-border);
  border-radius: var(--border-radius);
  padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 2);
  text-align: center;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color var(--transition), background-color var(--transition), transform var(--transition);
  min-height: 96px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
}
.dropzone:hover { border-color: var(--color-primary-hover); background: rgba(99, 102, 241, 0.06); }
.dropzone:active { transform: scale(0.99); }
/* 键盘可达：原生 file input 视觉隐藏（1px/opacity 0），聚焦态必须反馈到 dropzone 上，否则键盘用户无焦点提示 */
.dropzone:focus-within { border-color: var(--color-primary-hover); outline: 2px solid var(--color-primary-hover); outline-offset: 2px; }
.dropzone--compact { padding: calc(var(--spacing-unit) * 3); min-height: 72px; }

.dropzone .icon { font-size: var(--font-size-xl); line-height: 1; }
.dropzone strong { color: var(--color-text-primary); font-weight: 600; }

.dropzone input[type="file"] {

  position: absolute; width: 1px; height: 1px; opacity: 0; overflow: hidden; clip: rect(0 0 0 0);
}

.file-meta { color: var(--color-text-secondary); font-size: var(--font-size-sm); min-height: 1.2em; margin: calc(var(--spacing-unit) * 1) 0 0; overflow-wrap: anywhere; }

.btn-link {
  background: none; border: none; color: var(--color-primary-hover);
  font-size: var(--font-size-sm); cursor: pointer; padding: 6px 10px;
  min-height: 44px; min-width: 44px; border-radius: var(--border-radius);
}
.btn-link:hover { text-decoration: underline; }

.cover-row { display: flex; gap: calc(var(--spacing-unit) * 2); align-items: center; }

.cover-preview {
  width: 72px; height: 72px; flex: 0 0 72px;
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-raised);
  background-size: cover; background-position: center;
}
.cover-preview--filled { border-color: var(--color-primary); }

.canvas-wrap {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
}

#wave-canvas { display: block; width: 100%; height: auto; }

.canvas-overlay {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center; flex-direction: column; gap: calc(var(--spacing-unit) * 2);
  background: rgba(15, 15, 26, 0.72);
  color: var(--color-text-primary);
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition);
  text-align: center; padding: calc(var(--spacing-unit) * 3);
}
.canvas-overlay.is-visible { opacity: 1; }

.record-dot {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--color-error);
  animation: pulse 1.2s ease-out infinite;
}
@keyframes pulse {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(1.25); }
  100% { opacity: 1; transform: scale(1); }
}

.decoding-bar {
  width: min(320px, 70%);
  height: 6px; border-radius: 999px;
  background: var(--color-surface-raised); overflow: hidden;
}
.decoding-bar::after {
  content: ""; display: block; height: 100%; width: 40%;
  border-radius: 999px; background: var(--color-primary);
  animation: slide 1.1s ease-out infinite;
}
@keyframes slide {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(350%); }
}

.progress {
  margin-top: calc(var(--spacing-unit) * 2);
}
.progress[hidden] { display: none; }
.progress__track {
  height: 8px; border-radius: 999px; background: var(--color-surface-raised); overflow: hidden;
}
.progress__bar {
  height: 100%; width: 0%;
  background: var(--color-primary);
  border-radius: 999px;
  transition: width 150ms ease-out;
}
.progress__label { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin-top: 4px; text-align: center; }

.field { margin-bottom: calc(var(--spacing-unit) * 3); }

.field > label, .field > .field-label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: calc(var(--spacing-unit) * 1);
  font-weight: 600;
}

input[type="text"], input[type="number"] {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-radius: var(--border-radius);
  padding: 12px 14px;
  font-size: var(--font-size-md);
  transition: border-color var(--transition);
}
input[type="text"]:hover, input[type="number"]:hover { border-color: var(--color-primary-hover); }
input[type="text"]:focus, input[type="number"]:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25); }
input[type="text"]:disabled { opacity: 0.5; cursor: not-allowed; }

input[type="color"] {
  width: 48px; height: 44px;
  padding: 2px; border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-bg);
  cursor: pointer;
}
input[type="color"]:hover { border-color: var(--color-primary-hover); }
input[type="range"] { width: 100%; accent-color: var(--color-primary); min-height: 44px; }

.segmented { display: flex; gap: calc(var(--spacing-unit) * 1); flex-wrap: wrap; }

.segmented label {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; min-width: 64px;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: border-color var(--transition), color var(--transition), background-color var(--transition), transform var(--transition);
}
.segmented label:hover { border-color: var(--color-primary-hover); color: var(--color-text-primary); }
.segmented input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.segmented input:checked + span,
.segmented label:has(input:checked) { border-color: var(--color-primary); color: var(--color-text-primary); background: rgba(99, 102, 241, 0.14); }
.segmented input:focus-visible + span, .segmented label:has(input:focus-visible) { outline: 2px solid var(--color-primary-hover); outline-offset: 2px; }
.segmented span { pointer-events: none; }

.color-row { display: flex; gap: calc(var(--spacing-unit) * 3); flex-wrap: wrap; }
.color-item { display: flex; align-items: center; gap: 8px; }
.color-item > label { font-size: var(--font-size-sm); color: var(--color-text-secondary); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; min-width: 44px;
  padding: 12px 24px;
  border-radius: var(--border-radius);
  border: 1px solid transparent;
  font-size: var(--font-size-md);
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition), transform var(--transition), border-color var(--transition), opacity var(--transition);
}
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn[disabled], .btn[aria-busy="true"] { opacity: 0.55; cursor: not-allowed; }

.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover:not([disabled]):not([aria-busy="true"]) { background: var(--color-primary-hover); }

.btn--secondary { background: transparent; color: var(--color-primary-hover); border-color: var(--color-border); }
.btn--secondary:hover:not([disabled]) { border-color: var(--color-primary-hover); }

.btn--success { background: var(--color-success); color: #06220f; }
.btn--success:hover:not([disabled]) { filter: brightness(1.1); }

.actions { display: flex; gap: calc(var(--spacing-unit) * 2); flex-wrap: wrap; }

.result-status { min-height: 1.4em; font-size: var(--font-size-sm); margin: calc(var(--spacing-unit) * 2) 0 0; }
.result-status--error { color: var(--color-error); }
.result-status--success { color: var(--color-success); }

.error-actions { display: flex; gap: calc(var(--spacing-unit) * 1); flex-wrap: wrap; margin-top: calc(var(--spacing-unit) * 1); }
.error-actions[hidden] { display: none; }

input.is-error { border-color: var(--color-error) !important; }
input.is-error:focus { box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.25); }

.dropzone[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; }
.dropzone[aria-disabled="true"]:hover { border-color: var(--color-border); background: none; }

.panel-tag { color: var(--color-text-secondary); font-weight: 400; font-size: var(--font-size-sm); }
.cover-row .dropzone { flex: 1; }

.export-note { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin-top: calc(var(--spacing-unit) * 1); }
.export-note--error { color: var(--color-error); }

.consent-banner {
  position: fixed; left: 0; right: 0; bottom: 0;
  background: var(--color-surface-raised);
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow);
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
  z-index: 100;
  max-height: 40vh; overflow: auto;
}
.consent-banner[hidden] { display: none; }
.consent-inner { max-width: 1200px; margin: 0 auto; display: flex; gap: calc(var(--spacing-unit) * 3); align-items: center; flex-wrap: wrap; }
.consent-inner p { flex: 1 1 320px; margin: 0; font-size: var(--font-size-sm); color: var(--color-text-secondary); }
.consent-actions { display: flex; gap: calc(var(--spacing-unit) * 1); }

/* ================= Toast（role=status） ================= */
.toast {
  position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  transform: translate(-50%, 16px);
  background: var(--color-surface-raised);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 12px 20px;
  font-size: var(--font-size-sm);
  box-shadow: var(--shadow);
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 120;
  max-width: min(92vw, 560px);
}
.toast--show { opacity: 1; transform: translate(-50%, 0); }
.toast--error { border-color: var(--color-error); }
.toast--success { border-color: var(--color-success); }

.history-list { list-style: none; margin: 0; padding: 0; }
.history-item {
  display: flex; align-items: center; gap: calc(var(--spacing-unit) * 2);
  padding: calc(var(--spacing-unit) * 2) 0;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}
.history-item:last-child { border-bottom: none; }
.history-swatches { display: inline-flex; gap: 4px; }
.history-swatch { width: 16px; height: 16px; border-radius: 4px; border: 1px solid var(--color-border); display: inline-block; }
.history-main { font-size: var(--font-size-sm); color: var(--color-text-primary); }
.history-meta { font-size: var(--font-size-xs); color: var(--color-text-secondary); flex-basis: 100%; }
.history-empty { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin: 0; }
.history-toolbar { display: flex; gap: calc(var(--spacing-unit) * 1); flex-wrap: wrap; margin-top: calc(var(--spacing-unit) * 2); }
#history-count { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin: 0 0 calc(var(--spacing-unit) * 1); }

.doc-section { margin: calc(var(--spacing-unit) * 6) auto; }
.doc-section h2 { font-size: var(--font-size-xl); }
.doc-section h3 { font-size: var(--font-size-lg); }
.doc-section ol, .doc-section ul { color: var(--color-text-secondary); padding-left: 1.4em; }
.doc-section li { margin-bottom: 6px; }

blockquote[data-quote] {
  margin: calc(var(--spacing-unit) * 2) 0;
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
  background: var(--color-surface);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  overflow-wrap: anywhere;
}
blockquote[data-quote] code { color: var(--color-primary-hover); }

.faq details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: calc(var(--spacing-unit) * 1);
  padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
}
.faq summary {
  cursor: pointer; font-weight: 600; padding: 10px 0;
  color: var(--color-text-primary);
}
.faq p { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin: 0 0 8px; }

.source-list { font-size: var(--font-size-sm); color: var(--color-text-secondary); padding-left: 1.4em; }
.source-list li { margin-bottom: 4px; }

/* ================= Footer ================= */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: calc(var(--spacing-unit) * 6);
  padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 3);
}
.footer-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; gap: calc(var(--spacing-unit) * 3); flex-wrap: wrap; }
.footer-inner p { color: var(--color-text-secondary); font-size: var(--font-size-xs); margin: 0; flex-basis: 100%; }
.footer-inner nav { display: flex; gap: calc(var(--spacing-unit) * 2); }

.doc-page { max-width: 800px; }
.doc-page h1 { font-size: var(--font-size-xxl); }
.doc-page h2 { font-size: var(--font-size-lg); margin-top: calc(var(--spacing-unit) * 4); }
.doc-page p, .doc-page li { color: var(--color-text-secondary); }

.error-page { text-align: center; padding: calc(var(--spacing-unit) * 10) calc(var(--spacing-unit) * 3); }
.error-page h1 { font-size: var(--font-size-xxl); }
.error-page p { color: var(--color-text-secondary); }

@media (max-width: 1199px) {
  .workbench { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  main, header, footer, section { padding-left: calc(var(--spacing-unit) * 2); padding-right: calc(var(--spacing-unit) * 2); }
  .site-header h1 { font-size: var(--font-size-xl); }
  .actions .btn { flex: 1 1 100%; }
  .consent-inner { flex-direction: column; align-items: stretch; }
  .consent-actions .btn { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}