/* ============================================
   图片工具箱 - 全局样式
   精简、快速、移动端优先
   ============================================ */

/* --- CSS 变量 --- */
:root {
  --color-primary: #4F46E5;
  --color-primary-hover: #4338CA;
  --color-primary-light: #EEF2FF;
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F9FAFB;
  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-border: #E5E7EB;
  --color-success: #059669;
  --color-danger: #DC2626;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
  --max-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; font-family: inherit; }

/* --- 顶部导航 --- */
.header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.logo:hover { text-decoration: none; }

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
}

.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all 0.15s;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  text-decoration: none;
}

/* --- 主体 --- */
.main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 64px;
  width: 100%;
}

/* --- 工具卡片网格（首页） --- */
.hero {
  text-align: center;
  padding: 60px 0 48px;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.tool-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all 0.2s;
  display: block;
  text-decoration: none;
  color: var(--color-text);
}

.tool-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  text-decoration: none;
}

.tool-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.tool-card-icon.blue  { background: #EEF2FF; color: #4F46E5; }
.tool-card-icon.green { background: #ECFDF5; color: #059669; }
.tool-card-icon.amber { background: #FFFBEB; color: #D97706; }
.tool-card-icon.red   { background: #FEF2F2; color: #DC2626; }

.tool-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.tool-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- 工具页通用布局 --- */
.tool-header {
  text-align: center;
  margin-bottom: 40px;
}

.tool-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.tool-header p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
}

/* 上传区 */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  transition: all 0.2s;
  cursor: pointer;
  background: var(--color-bg-secondary);
  position: relative;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.upload-zone-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.upload-zone h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.upload-zone p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

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

/* 控制面板 */
.control-panel {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 24px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-end;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.control-group select,
.control-group input[type="number"] {
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--color-bg);
  min-width: 140px;
}

.control-group input[type="range"] {
  min-width: 160px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-secondary);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* 预览区 */
.preview-area {
  display: none;
  margin-top: 24px;
}

.preview-area.active {
  display: block;
}

.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 640px) {
  .preview-grid { grid-template-columns: 1fr; }
}

.preview-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.preview-card-header {
  padding: 12px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.preview-card-body {
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  background: repeating-conic-gradient(#F3F4F6 0% 25%, transparent 0% 50%) 50% / 20px 20px;
}

.preview-card-body img {
  max-height: 400px;
  object-fit: contain;
}

.file-size {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.size-reduced {
  color: var(--color-success);
  font-weight: 600;
}

/* 下载按钮区 */
.download-bar {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

/* 进度/状态提示 */
.status-msg {
  text-align: center;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-top: 16px;
  display: none;
}

.status-msg.success {
  display: block;
  background: #ECFDF5;
  color: #065F46;
}

.status-msg.error {
  display: block;
  background: #FEF2F2;
  color: #991B1B;
}

/* 调色板 */
.palette-colors {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  justify-content: center;
}

.palette-swatch {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  transition: transform 0.15s;
  box-shadow: var(--shadow);
}

.palette-swatch:hover {
  transform: scale(1.08);
}

.palette-swatch .hex {
  position: absolute;
  bottom: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

/* 页脚 */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
}

.footer a { color: var(--color-text-secondary); }
.footer a:hover { color: var(--color-primary); }

/* 广告位 */
.ad-slot {
  background: var(--color-bg-secondary);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  margin: 24px 0;
  overflow: hidden;
}

.ad-slot.sidebar {
  min-height: 250px;
}

/* SEO 内容区 */
.seo-content {
  max-width: 800px;
  margin: 64px auto 0;
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.seo-content h2 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.seo-content p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 12px;
}

/* 面包屑 */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  .hero { padding: 40px 0 32px; }
  .main { padding: 24px 16px 48px; }
  .header-inner { padding: 0 16px; }
  .nav-links a { padding: 6px 10px; font-size: 0.8rem; }
  .control-panel { flex-direction: column; }
  .control-group select,
  .control-group input[type="number"] { min-width: 100%; }
}

/* --- 移动端导航汉堡菜单 --- */
.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  padding: 4px;
  color: var(--color-text);
}

@media (max-width: 640px) {
  .hamburger { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 8px 16px;
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open { display: flex; }
}

/* ===== 推广横幅 ===== */
.promo-banner {
  display: block; max-width: 800px; margin: 0 auto 20px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border-radius: 14px; padding: 0; text-decoration: none;
  box-shadow: 0 4px 20px rgba(99,102,241,0.3);
  transition: all 0.3s ease; overflow: hidden; position: relative;
}
.promo-banner::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, #f59e0b, #ec4899, #6366f1);
  background-size: 400% 400%; animation: promo-shine 3s ease infinite;
  opacity: 0.15; z-index: 0;
}
@keyframes promo-shine {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
.promo-banner:hover {
  transform: translateY(-2px); box-shadow: 0 8px 30px rgba(99,102,241,0.45);
}
.promo-content {
  display: flex; align-items: center; gap: 16px; padding: 16px 24px;
  position: relative; z-index: 1;
}
.promo-icon { font-size: 32px; flex-shrink: 0; animation: promo-bounce 1.5s ease-in-out infinite; }
@keyframes promo-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.promo-text {
  display: flex; flex-direction: column; gap: 4px; flex: 1;
  color: #fff;
}
.promo-text strong { font-size: 18px; font-weight: 700; }
.promo-text span { font-size: 14px; opacity: 0.9; font-weight: 500; }
@media (max-width: 600px) {
  .promo-content { padding: 12px 16px; gap: 10px; }
  .promo-text strong { font-size: 15px; }
  .promo-text span { font-size: 12px; }
}