/* ==========================================================================
   fanshuaiqi.com · 全局共享样式
   定位：范帅琦粉丝/资料站 | 视觉：黑白灰高级感 + 中性帅气 + 低饱和点缀
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  --bg: #0d0d0f;          /* 页面主背景（暗黑） */
  --bg-2: #151518;        /* 次级背景卡片 */
  --bg-3: #1c1c21;        /* 悬浮/强调卡片 */
  --border: #26262c;      /* 描边 */
  --text: #f2f2f2;        /* 主文字 */
  --text-dim: #9a9aa3;    /* 次级文字 */
  --text-faint: #5c5c66;  /* 弱化文字 */
  --accent: #8a8a94;      /* 中性灰点缀 */
  --accent-red: #a8473f;  /* 低饱和暗红点缀（七喜/重点） */
  --accent-blue: #64707f; /* 低饱和灰蓝点缀 */
  --radius: 14px;
  --maxw: 1200px;
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.section { padding: 72px 0; }
.section-head { margin-bottom: 36px; }
.section-head .eyebrow {
  font-size: 13px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--accent-red); font-weight: 600; margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 700; letter-spacing: 1px; }
.section-head p { color: var(--text-dim); margin-top: 10px; max-width: 560px; }

/* ---------- 顶栏导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13, 13, 15, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 66px;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand .logo { font-weight: 800; font-size: 20px; letter-spacing: 2px; }
.brand .logo b { color: var(--text); }
.brand .logo em { font-style: normal; color: var(--accent-red); }
.brand .tag { font-size: 12px; color: var(--text-faint); letter-spacing: 1px; }

.nav-menu { display: flex; gap: 30px; align-items: center; }
.nav-menu a {
  font-size: 15px; color: var(--text-dim); letter-spacing: 1px;
  position: relative; transition: color .2s;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--text); }
.nav-menu a.active::after {
  content: ""; position: absolute; left: 0; bottom: -8px;
  width: 100%; height: 2px; background: var(--accent-red);
}
.nav-cta {
  font-size: 14px; color: var(--text); border: 1px solid var(--accent-red);
  padding: 8px 18px; border-radius: 999px; transition: all .25s; cursor: pointer;
  background: transparent;
}
.nav-cta:hover { background: var(--accent-red); }

/* 移动端汉堡 */
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; color: var(--text); }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; border: 1px solid var(--border); padding: 13px 30px;
  border-radius: 999px; font-size: 15px; letter-spacing: 1px; cursor: pointer;
  transition: all .25s; background: var(--bg-3); color: var(--text);
}
.btn-primary { background: var(--accent-red); border-color: var(--accent-red); }
.btn-primary:hover { background: #c2544b; transform: translateY(-2px); }
.btn-ghost:hover { border-color: var(--text); }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* ---------- 悬浮领取资料按钮（全局引流核心） ---------- */
.fab-wrap { position: fixed; right: 22px; bottom: 26px; z-index: 200; }
.fab-main {
  display: flex; align-items: center; gap: 10px;
  background: linear-gradient(135deg, var(--accent-red), #7c3129);
  color: #fff; border: none; border-radius: 999px;
  padding: 15px 26px; font-size: 16px; font-weight: 700; letter-spacing: 1px;
  cursor: pointer; box-shadow: 0 10px 30px rgba(168, 71, 63, 0.45);
  transition: transform .2s; font-family: var(--font);
}
.fab-main:hover { transform: translateY(-3px); }
.fab-main .pulse {
  width: 9px; height: 9px; border-radius: 50%; background: #7CffB2;
  box-shadow: 0 0 0 0 rgba(124, 255, 178, .7); animation: pulse 1.8s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(124, 255, 178, .6); }
  70% { box-shadow: 0 0 0 12px rgba(124, 255, 178, 0); }
  100% { box-shadow: 0 0 0 0 rgba(124, 255, 178, 0); }
}

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed; left: 22px; bottom: 26px; z-index: 200;
  width: 44px; height: 44px; border-radius: 50%; background: var(--bg-3);
  border: 1px solid var(--border); color: var(--text); cursor: pointer;
  font-size: 18px; display: none; align-items: center; justify-content: center;
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border); padding: 50px 0 90px;
  background: var(--bg-2);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.footer-brand p { color: var(--text-dim); font-size: 14px; margin-top: 12px; max-width: 320px; }
.footer-col h4 { font-size: 14px; letter-spacing: 2px; margin-bottom: 16px; color: var(--text); }
.footer-col a { display: block; color: var(--text-dim); font-size: 14px; margin-bottom: 10px; transition: color .2s; }
.footer-col a:hover { color: var(--text); }
.footer-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); text-align: center; color: var(--text-faint); font-size: 13px; }

/* ---------- 通用卡片网格 ---------- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: transform .3s, border-color .3s;
}
.card:hover { transform: translateY(-6px); border-color: #3a3a42; }
.card img { width: 100%; aspect-ratio: 3/4; object-fit: cover; transition: transform .4s; }
.card:hover img { transform: scale(1.04); }
.card-body { padding: 18px 20px 22px; }
.card-body h3 { font-size: 18px; margin-bottom: 6px; }
.card-body .meta { color: var(--text-dim); font-size: 13px; margin-bottom: 10px; }
.card-body p { color: var(--text-dim); font-size: 14px; }

/* ---------- 简单动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: all .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 页码内饰：作品库/杂志筛选 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 34px; }
.filter-btn {
  background: var(--bg-3); border: 1px solid var(--border); color: var(--text-dim);
  padding: 9px 20px; border-radius: 999px; cursor: pointer; font-size: 14px;
  transition: all .2s; font-family: var(--font);
}
.filter-btn:hover { color: var(--text); border-color: var(--text-faint); }
.filter-btn.active { background: var(--accent-red); color: #fff; border-color: var(--accent-red); }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .grid-4 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .nav-toggle { display: block; }
  .nav-menu {
    position: fixed; top: 66px; right: 0; width: 240px; height: 100%;
    background: var(--bg-2); flex-direction: column; align-items: flex-start;
    padding: 30px; gap: 24px; transform: translateX(100%); transition: transform .3s;
    border-left: 1px solid var(--border); z-index: 120;
  }
  .nav-menu.open { transform: none; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .fab-main { padding: 13px 20px; font-size: 14px; }
}
@media (max-width: 480px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .container { padding: 0 18px; }
  .brand .tag { display: none; }
}