/* =========================================================
   style.css —— 全部样式与主题变量
   ========================================================= */

/* ---------- 主题变量：浅色模式 ---------- */
:root {
  color-scheme: light;

  /* 布局尺寸 */
  --page-max: 1200px;          /* 内容最大宽度 */
  --radius-card: 36px;         /* 卡片圆角（Win7 风格的小圆角） */
  --radius-icon: 16px;          /* 方形图标圆角 */
  --card-border-width: 2px;    /* 卡片边框粗细 */

  /* 基础色 */
  --bg: #f4f7f6;
  --card-bg: rgba(255, 255, 255, 0.8);
  --title: #0d1412;
  --text: #64736f;

  /* 主题色：深青 #009999（与深色模式的 #00FFFF 同色相） */
  --accent-rgb: 0, 153, 153;
  --card-border: rgba(0, 153, 153, 0.55);        /* 常态边框 */
  --card-border-hover: rgba(0, 196, 196, 0.95);  /* 悬停：变浅 */
  --card-border-active: rgba(0, 102, 102, 1);    /* 按下：变深 */
  --glow: rgba(0, 153, 153, 0.13);               /* 标签径向渐变 */

  /* 标签 */
  --tag-border: rgba(13, 20, 18, 0.16);
  --tag-text: #6f7e7a;

  /* 阴影 */
  --shadow-hover: rgba(13, 20, 18, 0.18);
  --shadow-active: rgba(13, 20, 18, 0.08);

  /* 背景图遮罩浓度（由 config.js 里的 background.dim 覆盖） */
  --bg-dim: 0.86;
  --bg-veil: rgba(244, 247, 246, var(--bg-dim));
}

/* ---------- 主题变量：深色模式 ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --bg: #0c1010;
    --card-bg: rgba(21, 27, 26, 0.8);
    --title: #ffffff;
    --text: #93a3a0;

    /* 主题色：#00FFFF */
    --accent-rgb: 0, 255, 255;
    --card-border: rgba(0, 255, 255, 0.5);
    --card-border-hover: rgba(150, 255, 255, 0.95);
    --card-border-active: rgba(0, 140, 140, 1);
    --glow: rgba(0, 255, 255, 0.13);

    --tag-border: rgba(255, 255, 255, 0.16);
    --tag-text: #9dadaa;

    --shadow-hover: rgba(0, 0, 0, 0.55);
    --shadow-active: rgba(0, 0, 0, 0.35);

    --bg-veil: rgba(8, 12, 12, var(--bg-dim));
  }
}

/* ---------- 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* ---------- 背景图层 ---------- */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: 0;                  /* 位于内容之下、body 背景之上 */
  pointer-events: none;

  background-image: var(--bg-image, none);
  background-position: center center;
  background-size: cover;
  background-repeat: no-repeat;
}

/* 遮罩：让背景图在深浅两种模式下都保持足够对比度 */
.bg-layer::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--bg-veil);
  transition: background-color 0.25s ease;
}

/* 内容层压在背景之上 */
.site-header,
.site-main,
.site-footer {
  position: relative;
  z-index: 1;
}

/* ---------- 顶部 Logo ---------- */
.site-header {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 32px 24px 8px;
}

.logo-link {
  display: inline-block;
  border-radius: var(--radius-icon);
  text-decoration: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.logo-link:hover { opacity: 0.85; transform: translateY(-1px); }
.logo-link:active { opacity: 0.7; transform: translateY(0); }
.logo-link:focus-visible {
  outline: 2px solid var(--card-border-hover);
  outline-offset: 4px;
}

.logo {
  display: block;
  height: 48px;                        /* 显示高度，宽度按比例自适应 */
  width: auto;
  max-width: min(280px, 70vw);
  object-fit: contain;
}

/* ---------- 主体 / 网格 ---------- */
.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 28px 24px 56px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));  /* 1920 宽屏一行三个 */
  gap: 24px;
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px;

  background-color: var(--card-bg);
  border: var(--card-border-width) solid var(--card-border);
  border-radius: var(--radius-card);

  text-decoration: none;
  color: inherit;
  cursor: pointer;

  transition:
    border-color 0.18s ease,
    box-shadow 0.22s ease,
    transform 0.18s ease,
    background-color 0.25s ease;
}

@media (hover: hover) {
  .card:hover {
    border-color: var(--card-border-hover);
    box-shadow: 0 12px 32px var(--shadow-hover);
    transform: translateY(-3px);
  }
}

.card:active {
  border-color: var(--card-border-active);
  box-shadow: 0 4px 12px var(--shadow-active);
  transform: translateY(0) scale(0.995);
}

.card:focus-visible {
  outline: 2px solid var(--card-border-hover);
  outline-offset: 3px;
}

.card-head {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.card-icon {
  flex: 0 0 46px;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-icon);
  object-fit: cover;
  display: block;
  background-color: var(--glow);
}

.card-title {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--title);
  min-width: 0;
  overflow-wrap: anywhere;
  transition: color 0.25s ease;
}

.card-desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text);
  overflow-wrap: anywhere;
  transition: color 0.25s ease;
}

/* ---------- 标签 ---------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
  padding-top: 4px;
}

.tag {
  display: inline-block;
  padding: 5px 12px;
  font-size: 0.75rem;
  line-height: 1.25;
  white-space: nowrap;

  color: var(--tag-text);
  border: 1px solid var(--tag-border);
  border-radius: 999px;

  background-color: var(--card-bg);

  transition: background-color 0.25s ease;
}

/* ---------- 页脚 ---------- */
.site-footer {
  flex: 0 0 auto;
  padding: 24px 24px 40px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text);
  opacity: 0.75;
}

.site-footer p { margin: 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 680px) {
  .site-header { padding: 20px 18px 4px; }
  .logo { height: 36px; max-width: 62vw; }

  .site-main { padding: 16px 18px 36px; }

  .grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .card { padding: 18px; border-radius: var(--radius-card); gap: 12px; }

  .card-icon {
    flex-basis: 42px;
    width: 42px;
    height: 42px;
  }

  .card-title { font-size: 1rem; }
  .card-desc { font-size: 0.875rem; }

  .site-footer { padding: 16px 18px 32px; }
}

/* ---------- 减少动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  .card:hover { transform: none; }
}