/* ============================================
   Apple-style Clean UI
   游戏修图工具独立站 — 全局样式
   ============================================ */

:root {
  /* 苹果色系 */
  --color-bg: #f5f5f7;
  --color-surface: #ffffff;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-tertiary: #86868b;
  --color-blue: #0071e3;
  --color-blue-hover: #0077ed;
  --color-border: #d2d2d7;
  --color-border-light: #e8e8ed;
  --color-success: #34c759;
  --color-warning: #ff9500;
  --color-danger: #ff3b30;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12), 0 4px 8px rgba(0, 0, 0, 0.06);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;

  /* 过渡 */
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-blue);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-blue-hover);
}

img {
  max-width: 100%;
  display: block;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo:hover {
  color: var(--color-text);
}

.nav-logo svg {
  width: 22px;
  height: 22px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.nav-links a:hover {
  color: var(--color-text);
}

.lang-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  padding: 4px 12px;
  font-size: 12px;
  font-family: inherit;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 500;
}

.lang-toggle:hover {
  background: var(--color-blue);
  color: #fff;
  border-color: var(--color-blue);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero h1 .gradient {
  background: linear-gradient(135deg, #0071e3 0%, #5e5ce6 50%, #bf5af2 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: clamp(17px, 2vw, 21px);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  font-weight: 400;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: 100px;
  font-size: 13px;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.badge svg {
  width: 14px;
  height: 14px;
}

/* ============================================
   Tools Grid
   ============================================ */
.tools-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.tools-section h2 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  text-align: center;
}

.tools-section .subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: 48px;
  font-size: 17px;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.tool-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border);
}

.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 24px;
}

.tool-card h3 {
  font-size: 19px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.tool-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  flex: 1;
}

.tool-card .arrow {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-blue);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ============================================
   Tool Page Layout
   ============================================ */
.tool-page {
  max-width: 980px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.tool-page h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.tool-page .lead {
  font-size: 17px;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-xl);
  padding: 56px 32px;
  text-align: center;
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  margin-bottom: 24px;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--color-blue);
  background: rgba(0, 113, 227, 0.03);
}

.drop-zone svg {
  width: 48px;
  height: 48px;
  color: var(--color-text-tertiary);
  margin-bottom: 16px;
}

.drop-zone p {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.drop-zone .hint {
  font-size: 13px;
  color: var(--color-text-tertiary);
}

.drop-zone input[type="file"] {
  display: none;
}

/* Editor panel */
.editor-panel {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
}

.preview-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

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

.preview-box {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.preview-box img {
  max-width: 100%;
  max-height: 320px;
  object-fit: contain;
}

.preview-label {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 100px;
  font-weight: 500;
}

/* Controls */
.controls {
  display: grid;
  gap: 20px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.control-group input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-border);
  border-radius: 100px;
  outline: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-blue);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 113, 227, 0.4);
}

.control-group input[type="number"],
.control-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition);
}

.control-group input[type="number"]:focus,
.control-group select:focus {
  outline: none;
  border-color: var(--color-blue);
}

.range-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  min-width: 50px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* 滑块旁的数字精调输入框（吸附滑块拖粗调，输入框填任意整数） */
.range-num {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.range-num input {
  width: 64px;
  padding: 6px 8px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.range-num .unit {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), opacity var(--transition);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-blue);
  color: #fff;
}

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

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

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

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

.actions {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  flex-wrap: wrap;
}

/* Info bar */
.info-bar {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  padding: 16px 20px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}

.info-item {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.info-item strong {
  color: var(--color-text);
  font-weight: 600;
  margin-left: 4px;
  font-variant-numeric: tabular-nums;
}

/* ============================================
   Features section (homepage)
   ============================================ */
.features {
  background: var(--color-surface);
  padding: 80px 24px;
  border-top: 1px solid var(--color-border-light);
}

.features-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 40px;
}

.feature {
  text-align: center;
}

.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.feature h3 {
  font-size: 19px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================
   Tool Help Section (FAQ + JSON-LD)
   ============================================ */
.tool-help {
  max-width: 760px;
  margin: 48px auto 0;
  padding: 32px 24px;
  border-top: 1px solid var(--color-border-light);
  line-height: 1.7;
}
.tool-help h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--color-text);
}
.tool-help h2:first-child { margin-top: 0; }
.tool-help p { color: var(--color-text-secondary); font-size: 14px; margin: 0 0 8px; }
.tool-help ol { padding-left: 24px; color: var(--color-text-secondary); font-size: 14px; }
.tool-help ol li { margin-bottom: 8px; }
.tool-help strong { color: var(--color-text); }
.tool-help details {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 8px;
}
.tool-help details summary {
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
  color: var(--color-text);
  list-style: none;
}
.tool-help details summary::-webkit-details-marker { display: none; }
.tool-help details summary::before { content: '▶ '; font-size: 10px; color: var(--color-blue); margin-right: 4px; }
.tool-help details[open] summary::before { content: '▼ '; }
.tool-help details p { margin: 8px 0 0; font-size: 13px; color: var(--color-text-secondary); }

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border-light);
  padding: 40px 24px;
  text-align: center;
}

.footer p {
  font-size: 12px;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}

/* ============================================
   Toast notification
   ============================================ */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-text);
  color: #fff;
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding: 56px 20px 40px;
  }

  .tool-page {
    padding: 32px 20px 60px;
  }

  .editor-panel {
    padding: 20px;
  }
}

/* 图片接力条：把当前结果直接带进下一个工具，免重复上传 */
.handoff-bar {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.handoff-label {
  width: 100%;
  margin-bottom: 2px;
  font-size: 13px;
  color: var(--color-text-tertiary);
}
.handoff-link {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  font-size: 13px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: border-color .15s, color .15s, transform .15s;
}
.handoff-link:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
  transform: translateY(-1px);
}
.handoff-link.is-busy {
  opacity: .45;
  pointer-events: none;
}

/* 内容表格：工具说明区与博客正文共用（尺寸对照表等） */
.tool-help table,
.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 20px;
  font-size: 14px;
}
.tool-help th,
.tool-help td,
.article th,
.article td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--color-border-light);
  text-align: left;
}
.tool-help th,
.article th {
  color: var(--color-text-primary);
  font-weight: 600;
  background: var(--color-surface);
}
.tool-help td,
.article td {
  color: var(--color-text-secondary);
}