/* 公共样式（REQ-007 统一页面骨架）
   v0.2 交互升级：暗色模式、表单控件定制、微交互、触控友好、拖拽上传区 */
:root {
  --bg: #f8f9fb;
  --bg2: #ffffff;
  --ink: #1a1a2e;
  --muted: #6b7280;
  --rule: #e5e7eb;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent2: #7c3aed;
  --success: #059669;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --warn: #d97706;
  --warn-bg: #fffbeb;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --shadow-sm: 0 1px 3px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 6px 20px rgba(26, 26, 46, 0.1);
  --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101218;
    --bg2: #191c24;
    --ink: #e8eaf0;
    --muted: #9aa3b2;
    --rule: #2c313d;
    --accent: #5b8cff;
    --accent-hover: #7aa2ff;
    --success: #34d399;
    --success-bg: #0c2a22;
    --success-border: #1d5c48;
    --warn: #fbbf24;
    --warn-bg: #2c230c;
    --danger: #f87171;
    --danger-bg: #2c1414;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.5);
    --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' fill='none' stroke='%239aa3b2' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    color-scheme: dark;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg2);
  border-bottom: 1px solid var(--rule);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--ink);
  text-decoration: none;
}

.site-nav a {
  margin-left: 1.2rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent);
}

.security-banner {
  margin: 1.5rem 0;
  padding: 0.75rem 1rem;
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  border-radius: 8px;
  color: var(--success);
  font-weight: 600;
  font-size: 0.95rem;
}

.hero {
  padding: 2.5rem 0 1.5rem;
}

.hero h1 {
  font-size: 1.9rem;
  margin-bottom: 0.5rem;
}

.hero p {
  color: var(--muted);
  max-width: 720px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
  padding: 1rem 0 2rem;
}

.tool-card {
  background: var(--bg2);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1.25rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.tool-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--accent);
}

.tool-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.tool-card h3 a {
  color: inherit;
  text-decoration: none;
}

.tool-card h3 a:hover {
  color: var(--accent);
}

.tool-card .card-icon {
  display: inline-block;
  font-size: 1.4rem;
  margin-right: 0.4rem;
  vertical-align: -0.2rem;
}

.tool-card .tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  margin-right: 0.4rem;
  background: #eff6ff;
  color: var(--accent);
}

@media (prefers-color-scheme: dark) {
  .tool-card .tag {
    background: #1a2745;
  }
}

.tool-card .tag.soon {
  background: var(--bg);
  color: var(--muted);
}

.tool-card p {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 1.25rem 0 2rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

/* 帮助 FAQ（首页 #help） */
.faq-list {
  padding: 0.5rem 0 2rem;
}

.faq-list details {
  background: var(--bg2);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 0.9rem 1.25rem;
  margin-bottom: 0.75rem;
}

.faq-list summary {
  font-weight: 600;
  cursor: pointer;
  list-style-position: inside;
}

.faq-list details[open] summary {
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.faq-list p {
  color: var(--muted);
  font-size: 0.92rem;
}

/* 工具页通用表单样式 */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

.form-group input[type='text'],
.form-group input[type='number'],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--bg2);
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* select 自定义箭头 */
.form-group select {
  appearance: none;
  -webkit-appearance: none;
  background-image: var(--select-arrow);
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.2rem;
  cursor: pointer;
}

/* 滑块定制：填充轨道 + 圆形拇指 */
input[type='range'] {
  width: 100%;
  height: 1.5rem;
  accent-color: var(--accent);
  cursor: pointer;
}

input[type='range']::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(
    to right,
    var(--accent) 0%,
    var(--accent) var(--fill, 50%),
    var(--rule) var(--fill, 50%),
    var(--rule) 100%
  );
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -6px;
  border-radius: 50%;
  background: var(--bg2);
  border: 2px solid var(--accent);
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease;
}

input[type='range']:active::-webkit-slider-thumb {
  transform: scale(1.15);
}

input[type='range']::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: var(--rule);
}

input[type='range']::-moz-range-progress {
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
}

input[type='range']::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg2);
  border: 2px solid var(--accent);
  box-shadow: var(--shadow-sm);
}

/* 拖拽上传区 */
.dropzone {
  position: relative;
  border: 2px dashed var(--rule);
  border-radius: 12px;
  padding: 1.75rem 1rem;
  text-align: center;
  background: var(--bg2);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.dropzone strong {
  color: var(--accent);
}

.dropzone .muted {
  display: block;
  margin-top: 0.2rem;
}

.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(37, 99, 235, 0.06);
}

.dropzone input[type='file'] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.dropzone .dropzone-file {
  display: block;
  margin-top: 0.35rem;
  color: var(--success);
  font-size: 0.9rem;
  font-weight: 600;
  word-break: break-all;
}

.btn {
  display: inline-block;
  padding: 0.55rem 1.4rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
}

.btn:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow-sm);
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn.secondary {
  background: var(--bg2);
  color: var(--ink);
  border: 1px solid var(--rule);
}

.btn.secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg2);
}

/* 键盘可达性：明显的聚焦描边 */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* 工具页面板与操作区 */
.tool-panel {
  background: var(--bg2);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

/* 提示语：成功/失败图标增强语义 */
.hint {
  font-size: 0.9rem;
  color: var(--success);
}

.hint:not(:empty)::before {
  content: '✓ ';
  font-weight: 700;
}

.hint.error {
  color: var(--danger);
}

.hint.error:not(:empty)::before {
  content: '✕ ';
}

.muted {
  color: var(--muted);
  font-size: 0.85rem;
}

.options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.option {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
}

/* 复选框放大触控区并着色 */
.option input[type='checkbox'] {
  width: 1.05rem;
  height: 1.05rem;
  accent-color: var(--accent);
  cursor: pointer;
}

#preview-canvas {
  width: 100%;
  max-width: 620px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff; /* 预览恒为白底（打印品），暗色模式下加投影区分 */
}

@media (prefers-color-scheme: dark) {
  #preview-canvas {
    box-shadow: var(--shadow-md);
  }
}

.range-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.range-row input[type='number'] {
  width: 8rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  font-size: 0.95rem;
  background: var(--bg2);
  color: var(--ink);
}

.crop-stage {
  position: relative;
  display: inline-block;
  max-width: 100%;
}

.crop-stage canvas {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff;
}

.crop-box {
  position: absolute;
  border: 2px solid #2b5fbe;
  border-radius: 2px;
  cursor: move;
  touch-action: none;
}

.crop-box::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px dashed rgba(255, 255, 255, 0.85);
  pointer-events: none;
}

/* 三分构图参考线，帮助定位人像 */
.crop-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, transparent 33.3%, rgba(255, 255, 255, 0.35) 33.3%, rgba(255, 255, 255, 0.35) calc(33.3% + 1px), transparent calc(33.3% + 1px)),
    linear-gradient(to bottom, transparent 33.3%, rgba(255, 255, 255, 0.35) 33.3%, rgba(255, 255, 255, 0.35) calc(33.3% + 1px), transparent calc(33.3% + 1px));
  pointer-events: none;
}

.crop-handle {
  position: absolute;
  right: -7px;
  bottom: -7px;
  width: 14px;
  height: 14px;
  background: #2b5fbe;
  border: 2px solid #fff;
  border-radius: 3px;
  cursor: nwse-resize;
  touch-action: none;
}

/* 扩大触控命中区到 40px（视觉仍为 14px 手柄） */
.crop-handle::after {
  content: '';
  position: absolute;
  inset: -13px;
}

/* 成品预览（证件照） */
.result-preview {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.result-preview canvas {
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.result-list {
  margin-top: 1rem;
}

.result-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  background: var(--bg2);
  transition: border-color 0.15s ease;
}

.result-row:hover {
  border-color: var(--accent);
}

.result-thumb {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--rule);
  flex-shrink: 0;
}

.result-name {
  font-weight: 600;
  min-width: 10rem;
  word-break: break-all;
}

.result-meta {
  color: var(--muted);
  font-size: 0.85rem;
  flex: 1;
}

.btn.small {
  padding: 0.35rem 0.8rem;
  font-size: 0.85rem;
}

.form-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-row .form-group {
  flex: 1;
  min-width: 140px;
}

/* 窄屏适配：操作区换行、间距收紧 */
@media (max-width: 640px) {
  .hero {
    padding-top: 1.5rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .tool-panel {
    padding: 1rem;
  }

  .result-name {
    min-width: 6rem;
  }

  .result-row {
    flex-wrap: wrap;
  }
}

/* 用户偏好减少动态效果 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}