/* ============================================
   shared/style.css — 「做陶瓷」通用样式
   所有页面共享，改一处全站同步变
   ============================================ */

/* ---- 自定义属性（主题色变量） ---- */
:root {
  --color-primary: #d4773b;        /* 陶土橙 — 主色 */
  --color-primary-hover: #e08549;  /* 主色 hover */
  --color-secondary: #5b9bd5;      /* 青瓷蓝 — 辅色 */
  --color-accent: #f0c060;         /* 釉色金 — 强调色 */

  --color-bg-start: #1a1410;       /* 暗色渐变起 */
  --color-bg-end: #2a2018;         /* 暗色渐变止 */
  --color-card: #2d231e;           /* 卡片背景 */
  --color-card-hover: #382c25;     /* 卡片 hover 背景 */

  --color-text: #e8e0d8;           /* 主文字 — 暖白 */
  --color-text-secondary: #b8a898; /* 次要文字 */
  --color-text-muted: #8a7a6a;     /* 弱化文字 */

  --color-border: #3d322b;         /* 边框 */
  --color-border-light: #4d423b;   /* 浅边框 */

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;

  --max-width: 1200px;
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background: linear-gradient(135deg, var(--color-bg-start), var(--color-bg-end));
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ---- 导航栏 ---- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 20, 16, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
}

nav .nav-inner {
  width: 100%;
  max-width: var(--max-width);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

nav .nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
}

nav .nav-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

nav .nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

nav .nav-links a:hover,
nav .nav-links a:focus-visible {
  background: rgba(212, 119, 59, 0.15);
  color: var(--color-primary);
  outline: none;
}

nav .nav-links a[aria-current="page"] {
  background: rgba(212, 119, 59, 0.2);
  color: var(--color-primary);
  font-weight: 600;
}

/* ---- 主容器 ---- */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 20px 80px;
}

/* ---- 标题（渐变文字效果） ---- */
h1, h2, h3 {
  line-height: 1.3;
  font-weight: 700;
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}

h2 {
  font-size: 1.8rem;
  color: var(--color-text);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

h3 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

/* ---- 段落与文本 ---- */
p {
  margin-bottom: 16px;
  color: var(--color-text-secondary);
}

/* ---- 卡片 ---- */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform var(--transition-normal),
              box-shadow var(--transition-normal),
              background var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  background: var(--color-card-hover);
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  font-size: 0.95rem;
  margin-bottom: 16px;
}

/* ---- 网格卡片布局 ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

/* ---- 按钮 ---- */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              background var(--transition-fast);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #b8652e);
  color: #fff;
}

.btn-primary:hover, .btn-primary:focus-visible {
  background: linear-gradient(135deg, var(--color-primary-hover), var(--color-primary));
  box-shadow: 0 4px 16px rgba(212, 119, 59, 0.35);
  transform: translateY(-2px);
  outline: none;
}

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

.btn-secondary:hover, .btn-secondary:focus-visible {
  background: rgba(91, 155, 213, 0.1);
  transform: translateY(-2px);
  outline: none;
}

/* ---- 返回首页链接 ---- */
.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 24px;
  transition: color var(--transition-fast);
}

.back-home:hover {
  color: var(--color-primary);
}

.back-home::before {
  content: "←";
  font-size: 1.1rem;
}

/* ---- 页脚 ---- */
footer {
  text-align: center;
  padding: 32px 20px;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
  margin-top: 40px;
}

/* ---- 图片 ---- */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

/* ---- 列表 ---- */
ul, ol {
  color: var(--color-text-secondary);
  padding-left: 24px;
  margin-bottom: 16px;
}

li {
  margin-bottom: 6px;
}

/* ---- 响应式 ---- */
@media (max-width: 768px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.4rem; }
  main { padding: 24px 16px 60px; }

  nav .nav-inner {
    flex-direction: column;
    gap: 8px;
    padding: 8px 0;
  }

  nav .nav-links a {
    font-size: 0.8rem;
    padding: 4px 10px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  nav {
    height: auto;
    padding: 10px 12px;
  }

  nav .nav-links {
    justify-content: center;
  }

  .card {
    padding: 16px;
  }
}

/* ---- 工具类 ---- */
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.text-center { text-align: center; }