/* =========================================================
   噗噗pupu 个人介绍宣传页样式
   风格：暗红棕 · 资料库 / 媒体平台
   ========================================================= */

/* ---------- 1. 设计变量 (CSS Custom Properties) ---------- */
:root {
  /* 主色系：暗红棕 */
  --c-bg: #1b1210;            /* 页面近黑咖啡底色 */
  --c-bg-2: #241815;          /* 区块深棕底 */
  --c-panel: #2e1d18;         /* 卡片面板 */
  --c-line: #4a322a;          /* 细边框 */
  --c-line-soft: #3a2822;
  --c-primary: #4e342e;       /* 暗红棕主色 */
  --c-primary-deep: #3e2723;

  /* 强调色：琥珀金 / 暖橙 */
  --c-amber: #d9a441;         /* 琥珀金 */
  --c-orange: #c87941;        /* 暖橙 */
  --c-cta: #cc7a3a;           /* CTA 基色 */
  --c-cta-hover: #e0924f;     /* CTA 悬停 */

  /* 文字 */
  --c-text: #efe6dd;          /* 主正文 */
  --c-text-dim: #c9b9ae;      /* 次要文字 */
  --c-text-faint: #9c8578;    /* 弱文字 */

  /* 字体 */
  --font-title: "Georgia", "Times New Roman", "SimSun", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;

  /* 动效 */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --shadow-card: 0 8px 26px rgba(0, 0, 0, .45);
  --ring: 0 0 0 3px rgba(204, 122, 58, .25);
}

/* ---------- 2. 重置与基础 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  font-family: var(--font-body);
  color: var(--c-text);
  background-color: var(--c-bg);
  /* 细腻噪点 + 纸张颗粒质感的背景层 */
  background-image:
    radial-gradient(1200px 800px at 20% -10%, rgba(204, 122, 58, .06), transparent 60%),
    radial-gradient(1000px 700px at 90% 110%, rgba(78, 52, 46, .5), transparent 55%);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 纸张颗粒纹理层 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .5;
  mix-blend-mode: overlay;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 120 120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

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

.container {
  width: min(1120px, 92%);
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.main, main { position: relative; }

/* ---------- 3. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .78rem 1.6rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .03em;
  cursor: pointer;
  border: 1px solid transparent;
  transition:
    transform .28s var(--ease),
    box-shadow .28s var(--ease),
    background-color .28s var(--ease),
    border-color .28s var(--ease),
    color .28s var(--ease);
  will-change: transform;
  user-select: none;
}

/* CTA 主按钮：暖橙主打 */
.btn-cta {
  background-image: linear-gradient(180deg, var(--c-cta-hover), var(--c-cta));
  color: #2a160c;
  border-color: rgba(255, 220, 180, .35);
  box-shadow: 0 6px 18px rgba(204, 122, 58, .35);
}
.btn-cta:hover {
  background-image: linear-gradient(180deg, #f2a562, #d9853f);
  color: #1e0f07;
  transform: translateY(-3px);
  box-shadow: 0 10px 26px rgba(224, 146, 79, .5), 0 0 18px rgba(217, 164, 65, .45);
}
.btn-cta:active {
  transform: translateY(0) scale(.97);
  box-shadow: 0 3px 10px rgba(204, 122, 58, .3);
}

/* 幽灵/描边按钮 */
.btn-ghost, .btn-outline {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-line);
}
.btn-ghost:hover, .btn-outline:hover {
  color: #fff;
  border-color: var(--c-amber);
  background: rgba(217, 164, 65, .08);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, .3);
}

.btn-nav {
  padding: .5rem 1.05rem;
  font-size: .9rem;
  border-radius: 8px;
}

/* Hero CTA 呼吸脉冲动效 */
.btn-pulse {
  animation: breathe 2.6s ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { box-shadow: 0 6px 18px rgba(204, 122, 58, .35), 0 0 0 0 rgba(224, 146, 79, .5); }
  50%      { box-shadow: 0 6px 22px rgba(224, 146, 79, .5), 0 0 0 12px rgba(224, 146, 79, 0); }
}

/* ---------- 4. 粘性导航 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(27, 18, 16, .82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-line-soft);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: .85rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--c-text);
}
.brand-mark { filter: drop-shadow(0 2px 6px rgba(0,0,0,.5)); }
.brand-dot { color: var(--c-amber); margin-inline: .15rem; }

.nav-links {
  display: flex;
  gap: 1.5rem;
}
.nav-links a {
  font-size: .95rem;
  color: var(--c-text-dim);
  transition: color .2s;
}
.nav-links a:hover { color: var(--c-amber); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  background: none;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  padding: 8px 9px;
  cursor: pointer;
}
.nav-toggle .bar {
  width: 20px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform .25s var(--ease), opacity .25s;
}
.nav-toggle.open .bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open .bar:nth-child(2) { opacity: 0; }
.nav-toggle.open .bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 5. Hero 首屏 ---------- */
.hero {
  position: relative;
  padding: clamp(5rem, 12vh, 7.5rem) 0;
  text-align: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(circle at 50% 20%, rgba(78, 52, 46, .85), rgba(27, 18, 16, 0) 65%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.02) 0 1px, transparent 1px 3px);
}
.hero-inner { display: flex; flex-direction: column; align-items: center; gap: 1.3rem; }
.hero-eyebrow {
  font-size: .8rem;
  letter-spacing: .35em;
  text-transform: uppercase;
  color: var(--c-amber);
  font-weight: 600;
}
.hero-title {
  font-family: var(--font-title);
  font-size: clamp(3rem, 9vw, 6rem);
  font-weight: 800;
  line-height: 1;
  color: var(--c-text);
  text-shadow: 0 6px 22px rgba(0, 0, 0, .5);
}
.hero-title .accent { color: var(--c-amber); }
.hero-subtitle {
  max-width: 46rem;
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  color: var(--c-text-dim);
  line-height: 1.9;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: .4rem;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  justify-content: center;
  margin-top: .8rem;
}
.hero-badges li {
  padding: .4rem .9rem;
  font-size: .85rem;
  color: var(--c-text-dim);
  background: rgba(78, 52, 46, .4);
  border: 1px solid var(--c-line);
  border-radius: 999px;
}

/* ---------- 6. 通用区块 ---------- */
.section {
  padding: clamp(3.5rem, 8vh, 5.5rem) 0;
  border-top: 1px solid var(--c-line-soft);
}
.section:nth-of-type(even) { background: linear-gradient(180deg, var(--c-bg-2), var(--c-bg)); }

.section-head {
  text-align: center;
  margin-bottom: clamp(2rem, 5vh, 3rem);
}
.section-tag {
  display: inline-block;
  font-size: .75rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--c-amber);
  margin-bottom: .6rem;
}
.section-title {
  font-family: var(--font-title);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 700;
  margin-bottom: .5rem;
}
.section-intro { color: var(--c-text-dim); }

/* ---------- 7. 关于我 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}
.about-card {
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-amber);
  border-radius: 14px;
  padding: 1.7rem 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform .3s var(--ease);
}
.about-card:hover { transform: translateY(-6px); }
.about-icon {
  font-size: 2rem;
  display: inline-block;
  margin-bottom: .8rem;
}
.about-name {
  font-family: var(--font-title);
  font-size: 1.25rem;
  margin-bottom: .5rem;
}
.about-card p { color: var(--c-text-dim); font-size: .95rem; }

/* ---------- 8. 资料库卡片 ---------- */
.archive-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.3rem;
}
.card {
  position: relative;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transition: transform .32s var(--ease), box-shadow .32s var(--ease);
}
.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, .55), 0 0 0 1px var(--c-line);
}
.card-head {
  position: relative;
  padding: 1.2rem 1.3rem;
  background: linear-gradient(135deg, rgba(255,255,255,.04), transparent);
  border-bottom: 1px dashed var(--c-line);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-head::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: var(--card-accent);
  opacity: .85;
}
.card-icon { font-size: 2rem; }
.card-label {
  font-size: .7rem;
  letter-spacing: .22em;
  color: var(--c-text-faint);
}
.card-title {
  font-family: var(--font-title);
  font-size: 1.3rem;
  padding: 1.1rem 1.3rem 0;
}
.card-desc {
  flex-grow: 1;
  padding: .5rem 1.3rem 1.2rem;
  color: var(--c-text-dim);
  font-size: .92rem;
}
.card .btn {
  align-self: flex-start;
  margin: 0 1.3rem 1.3rem;
  padding: .55rem 1.05rem;
  font-size: .9rem;
}

/* ---------- 9. 领取流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
  counter-reset: step;
}
.step {
  position: relative;
  background: var(--c-bg-2);
  border: 1px solid var(--c-line);
  border-radius: 14px;
  padding: 1.8rem 1.4rem;
  text-align: center;
  transition: transform .3s var(--ease);
}
.step:hover { transform: translateY(-6px); }
.step-num {
  position: absolute;
  top: .8rem;
  right: 1rem;
  font-family: var(--font-title);
  font-size: 1.1rem;
  color: var(--c-amber);
  opacity: .8;
}
.step-icon { font-size: 2.4rem; display: block; margin-bottom: .8rem; }
.step-text h3 {
  font-family: var(--font-title);
  font-size: 1.2rem;
  margin-bottom: .4rem;
}
.step-text p { color: var(--c-text-dim); font-size: .92rem; }

/* 步骤区底部 CTA 居中 */
.steps-cta {
  margin-top: 2.2rem;
  text-align: center;
}

/* ---------- 9.5 图片展示区 ---------- */
.gallery { background: var(--c-bg-2); }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.gallery-item {
  margin: 0;
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
  box-shadow: var(--shadow-card);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.gallery-item:hover {
  transform: translateY(-6px);
  border-color: var(--c-amber);
  box-shadow: 0 14px 32px rgba(0, 0, 0, .55);
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  aspect-ratio: 4 / 3;
  transition: transform .6s var(--ease);
}
.gallery-item:hover img { transform: scale(1.05); }

/* ---------- 10. FAQ 常见问题 ---------- */
.faq { background: var(--c-bg-2); }
.faq-list {
  max-width: 860px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: .9rem;
}
.faq-item {
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: 12px;
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.faq-item:hover { border-color: var(--c-amber); }
.faq-item[open] { border-color: var(--c-amber); box-shadow: var(--ring); }
.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.3rem;
  font-weight: 600;
  color: var(--c-text);
  position: relative;
}
/* 自定义展开箭头 */
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  line-height: 1;
  color: var(--c-amber);
  transition: transform .3s var(--ease);
  flex-shrink: 0;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary:hover { color: var(--c-amber); }
.faq-item > p {
  padding: 0 1.3rem 1rem;
  margin: 0;
  color: var(--c-text-dim);
  font-size: .95rem;
  line-height: 1.75;
}

/* ---------- 10. 底部 CTA ---------- */
.cta {
  padding: clamp(4rem, 10vh, 6.5rem) 0;
  text-align: center;
  border-top: 1px solid var(--c-line-soft);
  background:
    radial-gradient(circle at 50% 0%, rgba(204, 122, 58, .14), transparent 60%),
    var(--c-bg-2);
}
.cta-inner { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.cta-title {
  font-family: var(--font-title);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  margin-bottom: .3rem;
}
.cta-sub { color: var(--c-text-dim); letter-spacing: .12em; }
.btn-cta-lg { padding: 1.05rem 2.4rem; font-size: 1.15rem; }

/* ---------- 11. 页脚 ---------- */
.footer {
  border-top: 1px solid var(--c-line);
  background: #150d0b;
  padding: 2.2rem 0;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .4rem;
  text-align: center;
  color: var(--c-text-faint);
  font-size: .88rem;
}
.footer-brand { font-family: var(--font-title); color: var(--c-text-dim); }

/* ---------- 12. 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 1.4rem;
  bottom: 1.4rem;
  z-index: 90;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--c-text);
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
  box-shadow: var(--shadow-card);
}
.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-top:hover { color: var(--c-amber); border-color: var(--c-amber); }

/* ---------- 13. 滚动出现动画 (fadeInUp) ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.fade-up.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* 减弱动效偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
  .fade-up { opacity: 1; transform: none; }
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 980px) {
  .archive-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; max-width: 560px; margin-inline: auto; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(27, 18, 16, .97);
    border-bottom: 1px solid var(--c-line);
    padding: .4rem 0;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .85rem 1.4rem; font-size: 1rem; }
  .nav-toggle { display: flex; }
  .btn-nav { display: none; }

  .archive-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn-hero { width: 100%; }
}