:root {
  font: 100%/1.5 -apple-system, "SF Pro", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --accent: #0071e3;
  --accent-press: #0058b0;
  --error: #d70015;
  --error-bg: #fdecea;
  --radius: 20px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
  --toolbar-bg: rgba(255, 255, 255, 0.6);
  --toolbar-border: rgba(255, 255, 255, 0.4);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --line: #38383a;
    --accent: #0a84ff;
    --accent-press: #409cff;
    --error: #ff6961;
    --error-bg: #3a1a1a;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
    --toolbar-bg: rgba(28, 28, 30, 0.6);
    --toolbar-border: rgba(255, 255, 255, 0.08);
  }
}

/* 手动主题：优先级高于系统偏好 */
:root[data-theme="light"] {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --accent: #0071e3;
  --accent-press: #0058b0;
  --error: #d70015;
  --error-bg: #fdecea;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
  --toolbar-bg: rgba(255, 255, 255, 0.6);
  --toolbar-border: rgba(255, 255, 255, 0.4);
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #000000;
  --card: #1c1c1e;
  --text: #f5f5f7;
  --muted: #a1a1a6;
  --line: #38383a;
  --accent: #0a84ff;
  --accent-press: #409cff;
  --error: #ff6961;
  --error-bg: #3a1a1a;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
  --toolbar-bg: rgba(28, 28, 30, 0.6);
  --toolbar-border: rgba(255, 255, 255, 0.08);
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

/* 顶栏毛玻璃：内容从下方透出 */
.toolbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--toolbar-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--toolbar-border);
}
.toolbar-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { font-weight: 700; letter-spacing: -0.01em; }
.health { color: var(--muted); font-size: 12px; }
.health.ok { color: #30d158; }
.health.bad { color: var(--error); }

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 60px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  /* 只用 transform/opacity 做动效 */
  animation: rise 0.35s ease-out both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(8px) scale(0.99); }
  to { opacity: 1; transform: none; }
}

.display {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.sub { margin: 0 0 8px; color: var(--muted); font-size: 15px; line-height: 1.6; }
.formats { margin: 0; color: var(--muted); font-size: 13px; }
code { font-family: ui-monospace, "SF Mono", Consolas, monospace; font-size: 0.9em; }

/* 拖拽区：整块可点，悬停即时反馈 */
.dropzone {
  border: 2px dashed var(--line);
  text-align: center;
  cursor: pointer;
  transition: transform 100ms ease-out, box-shadow 150ms ease-out, border-color 150ms ease-out;
  outline: none;
}
.dropzone:hover { box-shadow: var(--shadow-hover); }
.dropzone:active { transform: scale(0.99); } /* 按下即反馈 */
.dropzone:focus-visible { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.25); }
.dropzone.dragover {
  border-color: var(--accent);
  border-style: solid;
  box-shadow: var(--shadow-hover);
  transform: scale(1.01);
}
.dz-icon {
  font-size: 32px;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.dz-title { margin: 0 0 4px; font-weight: 600; font-size: 17px; letter-spacing: -0.01em; }
.dz-hint { margin: 0; color: var(--muted); font-size: 13px; }

/* 状态区 */
.status-row { display: flex; align-items: center; gap: 10px; }
#statusText { flex: 1; }
.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.progress {
  margin-top: 12px;
  height: 6px;
  border-radius: 3px;
  background: var(--line);
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 120ms linear; /* 跟手进度 */
}
.progress-bar.indeterminate {
  width: 40% !important;
  animation: slide 1.2s ease-in-out infinite alternate;
}
@keyframes slide {
  from { transform: translateX(-60%); }
  to { transform: translateX(220%); }
}
.error {
  margin: 12px 0 0;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--error-bg);
  color: var(--error);
  font-size: 14px;
}
.warn {
  margin: 0 0 12px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(255, 159, 10, 0.15);
  color: #b25000;
  font-size: 14px;
}
@media (prefers-color-scheme: dark) {
  .warn { color: #ffd60a; }
}
/* 手动浅色时压住上面的深色媒体查询 */
:root[data-theme="light"] .warn { color: #b25000; }
:root[data-theme="dark"] .warn { color: #ffd60a; }

/* 结果区 */
.result-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.result-title { margin: 0; font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.result-meta { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.result-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-start; }
.preview {
  margin: 0;
  max-height: 480px;
  overflow: auto;
  padding: 16px;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
  font-size: 13.5px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 100ms ease-out, background 150ms ease-out;
}
.btn:active { transform: scale(0.97); } /* 按下即反馈 */
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:active { background: var(--accent-press); }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: 0.5; cursor: default; transform: none; }

.foot { color: var(--muted); font-size: 12px; text-align: center; }

/* 模式分段切换：与工具栏同材质语言 */
.segmented {
  display: flex;
  padding: 4px;
  gap: 4px;
  border-radius: 999px;
  background: var(--card);
  box-shadow: var(--shadow);
  width: max-content;
  max-width: 100%;
  margin: 0 auto;
}
.seg-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 8px 22px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 150ms ease-out, color 150ms ease-out, transform 100ms ease-out;
}
.seg-btn:active { transform: scale(0.97); }
.seg-btn[aria-selected="true"] {
  background: var(--accent);
  color: #fff;
}
.seg-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.wait { color: var(--muted); font-size: 13px; white-space: nowrap; }
#errorText:focus { outline: none; }
#errorText:focus-visible { outline: 2px solid var(--error); outline-offset: 2px; }

/* 降级：减少动态 + 减少透明 + 高对比 */
@media (prefers-reduced-motion: reduce) {
  .card { animation: fade 200ms ease both; }
  @keyframes fade { from { opacity: 0; } to { opacity: 1; } }
  .spinner, .progress-bar.indeterminate { animation: none; }
  .dropzone, .btn { transition: none; transform: none !important; }
}
@media (prefers-reduced-transparency: reduce) {
  .toolbar { background: var(--card); backdrop-filter: none; -webkit-backdrop-filter: none; }
}
@media (prefers-contrast: more) {
  .dropzone { border-color: var(--text); }
  .error { border: 2px solid currentColor; }
}

/* 小屏：操作按钮全宽竖排 */
@media (max-width: 420px) {
  .result-actions { flex-direction: column; align-items: stretch; }
  .result-actions .btn { width: 100%; }
  .segmented { width: 100%; }
  .seg-btn { flex: 1; padding: 8px 0; }
}

/* 顶栏右侧：主题按钮 + 状态灯 */
.toolbar-right { display: flex; align-items: center; gap: 10px; }
.theme-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 100ms ease-out, color 150ms ease-out;
}
.theme-btn:active { transform: scale(0.95); }
.theme-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }