/* =========================================================
   生活手记 · 个人博客样式（冬景蓝调版）
   以冬日森林为视觉基调：清冷蓝、雪白色、冰雾灰
   ========================================================= */

:root {
  /* 主色板 */
  --bg: #f4f7fb;            /* 雪雾蓝白背景 */
  --bg-soft: #e9eff6;       /* 浅冷灰 */
  --surface: #ffffff;       /* 卡片白 */
  --ink: #17233b;           /* 深冷蓝文字 */
  --ink-soft: #5a6a82;      /* 次级文字 */
  --ink-faint: #8d9ab0;     /* 弱化文字 */
  --accent-blue: #5d7fae;   /* 冬蓝点缀 */
  --accent-blue-deep: #3b5d8a;
  --accent-ice: #9ec4e7;    /* 冰蓝高光 */
  --accent-ice-deep: #6a9bc7;
  --line: #dce4ee;          /* 分隔线 */
  --line-soft: #e8eff7;

  --maxw: 1120px;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 26px;
  --shadow-sm: 0 2px 10px rgba(23, 35, 59, 0.05);
  --shadow: 0 8px 30px rgba(23, 35, 59, 0.08);
  --shadow-lg: 0 22px 60px rgba(23, 35, 59, 0.14);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --font: "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Playfair Display", "Songti SC", Georgia, serif;
  --transition: all 0.35s var(--ease-soft);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(94, 143, 193, 0.28);
  color: var(--ink);
}

.container {
  width: min(var(--maxw), 90%);
  margin-inline: auto;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(23, 35, 59, 0.25);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background 0.4s var(--ease-soft), box-shadow 0.4s var(--ease-soft), border-color 0.4s var(--ease-soft);
}
.site-header.scrolled {
  background: rgba(23, 35, 59, 0.88);
  border-bottom-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 6px 24px rgba(23, 35, 59, 0.18);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: #fff;
  text-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
.brand::first-letter { color: var(--accent-ice); }

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

.main-nav a {
  position: relative;
  font-size: 0.98rem;
  color: rgba(255,255,255,0.82);
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 999px;
  transition: var(--transition);
}
.main-nav a:hover {
  color: #fff;
  background: rgba(255,255,255,0.12);
}
.main-nav a.active {
  color: #fff;
  background: rgba(94, 143, 193, 0.28);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  transition: var(--transition);
  border-radius: 2px;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------------- Hero ---------------- */
.hero {
  position: relative;
  min-height: 100vh;
  padding: clamp(140px, 18vh, 190px) 0 clamp(90px, 12vh, 130px);
  overflow: hidden;
  display: flex;
  align-items: center;
  background:
    linear-gradient(180deg, rgba(23,35,59,0.35) 0%, rgba(23,35,59,0.55) 100%),
    url("../assets/hero-bg.jpg") center / cover no-repeat;
}
.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  z-index: 1;
  pointer-events: none;
}
.hero::before {
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(158, 196, 231, 0.28), transparent 70%);
  top: -90px; right: 6%;
}
.hero::after {
  width: 440px; height: 440px;
  background: radial-gradient(circle, rgba(255,255,255,0.16), transparent 70%);
  bottom: -140px; left: -70px;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 60px;
  position: relative;
  z-index: 3;
}

.hero-text { flex: 1; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 1.5px;
  color: rgba(255,255,255,0.92);
  background: rgba(255,255,255,0.14);
  backdrop-filter: blur(6px);
  padding: 7px 16px;
  border-radius: 999px;
  margin-bottom: 22px;
  border: 1px solid rgba(255,255,255,0.15);
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(2.3rem, 5vw, 3.3rem);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: 0.5px;
  color: #fff;
  margin-bottom: 20px;
  text-shadow: 0 2px 18px rgba(0,0,0,0.25);
}

.hero-subtag {
  font-size: 1.12rem;
  color: rgba(255,255,255,0.85);
  max-width: 470px;
  margin-bottom: 36px;
  font-weight: 300;
  line-height: 1.85;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  padding: 14px 32px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 500;
  transition: var(--transition);
  letter-spacing: 0.5px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-blue-deep));
  color: #fff;
  box-shadow: 0 10px 24px rgba(59, 93, 138, 0.38);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 32px rgba(36, 62, 99, 0.42);
}
.btn-ghost {
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.45);
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.2);
  transform: translateY(-3px);
}

/* hero 插画元素 */
.hero-illus {
  width: 260px;
  height: 260px;
  position: relative;
  flex-shrink: 0;
}
.illus-card {
  position: absolute;
  display: grid;
  place-items: center;
  font-size: 2.6rem;
  border-radius: var(--radius);
  box-shadow: 0 18px 50px rgba(0,0,0,0.18);
  animation: floaty 5s ease-in-out infinite;
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(6px);
}
.card-sun {
  top: 10px; right: 20px;
  width: 96px; height: 96px;
  background: rgba(255,255,255,0.18);
}
.card-cup {
  top: 110px; left: 0;
  width: 82px; height: 82px;
  background: rgba(255,255,255,0.12);
  animation-delay: 1.2s;
}
.card-note {
  bottom: 6px; right: 8px;
  width: 88px; height: 88px;
  background: rgba(255,255,255,0.15);
  animation-delay: 2.2s;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

/* 向下滚动提示 */
.scroll-cue {
  position: absolute;
  left: 50%; bottom: 22px;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid rgba(255,255,255,0.45);
  border-radius: 999px;
  z-index: 3;
  display: grid;
  justify-items: center;
  padding-top: 7px;
  transition: var(--transition);
}
.scroll-cue span {
  width: 4px; height: 8px;
  border-radius: 2px;
  background: rgba(255,255,255,0.8);
  animation: cue 1.6s var(--ease) infinite;
}
@keyframes cue {
  0% { opacity: 0; transform: translateY(0); }
  40% { opacity: 1; }
  100% { opacity: 0; transform: translateY(14px); }
}
.scroll-cue:hover { border-color: var(--accent-ice); }

.hero-wave {
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  z-index: 2;
}
.hero-wave svg { display: block; width: 100%; height: 60px; }

/* ---------------- 通用 section ---------------- */
.section { padding: clamp(64px, 9vw, 112px) 0; }

.section-head { margin-bottom: clamp(34px, 4vw, 54px); }
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.5vw, 2.4rem);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
  padding-bottom: 12px;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 48px; height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent-ice), var(--accent-blue));
}
.section-sub { color: var(--ink-soft); font-size: 1.02rem; }

/* ---------------- 博客文章网格 ---------------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.post-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
  display: flex;
  flex-direction: column;
  cursor: pointer;
}
.post-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.post-thumb {
  height: 196px;
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  font-size: 3.6rem;
  transition: transform 0.5s var(--ease);
}
.post-card:hover .post-thumb { transform: scale(1.05); }
.post-thumb::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0) 55%, rgba(255,255,255,0.28));
  pointer-events: none;
}

.post-badge {
  position: absolute;
  top: 14px; left: 14px;
  z-index: 2;
  font-size: 0.75rem;
  color: #fff;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 1px;
  backdrop-filter: blur(2px);
}

.post-body { padding: 24px 26px 26px; flex: 1; display: flex; flex-direction: column; }

.post-date {
  font-size: 0.8rem;
  color: var(--ink-faint);
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}
.post-title {
  font-size: 1.24rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color 0.3s var(--ease-soft);
}
.post-card:hover .post-title { color: var(--accent-blue-deep); }
.post-excerpt {
  font-size: 0.95rem;
  color: var(--ink-soft);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-tags { margin-top: 18px; display: flex; gap: 8px; flex-wrap: wrap; }
.post-tags span {
  font-size: 0.78rem;
  color: var(--accent-blue-deep);
  background: rgba(93, 127, 174, 0.12);
  padding: 3px 12px;
  border-radius: 999px;
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--ink-soft);
  padding: 60px 0;
  font-size: 1.05rem;
}

/* ---------------- 关于我 ---------------- */
.about { background: var(--bg-soft); }

.about-inner {
  display: flex;
  gap: 56px;
  align-items: center;
}
.about-avatar { flex-shrink: 0; }

.avatar-frame {
  position: relative;
  width: 158px; height: 158px;
  border-radius: 50%;
  padding: 5px;
  background: linear-gradient(135deg, var(--accent-ice), var(--accent-blue));
  box-shadow: var(--shadow-lg);
  z-index: 1;
}
.avatar-frame::after {
  content: "";
  position: absolute; inset: -8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-ice), var(--accent-blue));
  z-index: -1;
  opacity: 0.35;
  filter: blur(8px);
}
.avatar-frame img {
  width: 100%; height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--surface);
}

.about-text p {
  color: var(--ink-soft);
  margin-bottom: 16px;
  font-size: 1.04rem;
  max-width: 620px;
  line-height: 1.9;
}
.about-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.about-tags span {
  padding: 7px 17px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  font-size: 0.9rem;
  color: var(--ink);
  transition: var(--transition);
}
.about-tags span:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue-deep);
  transform: translateY(-2px);
}

/* ---------------- 联系我 ---------------- */
.contact-inner { text-align: center; }
.contact-inner .section-title::after { left: 50%; transform: translateX(-50%); }
.contact-desc {
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 480px;
  margin: 16px auto 46px;
  line-height: 1.85;
}
.contact-ways {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.contact-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
}
.contact-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--accent-blue);
}
.ci-icon {
  font-size: 1.8rem;
  width: 56px; height: 56px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(93, 127, 174, 0.12);
  margin-bottom: 4px;
  transition: var(--transition);
}
.contact-item:hover .ci-icon { background: rgba(93, 127, 174, 0.2); transform: scale(1.06); }
.ci-label { font-size: 0.82rem; color: var(--ink-soft); letter-spacing: 1.5px; }
.ci-value { font-weight: 500; color: var(--ink); font-size: 1rem; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  background: #141b29;
  color: #b8c4d6;
  padding: 48px 0;
  text-align: center;
}
.footer-inner p { font-size: 0.98rem; }
.footer-inner .footer-note {
  margin-top: 8px;
  font-size: 0.85rem;
  opacity: 0.7;
  font-style: italic;
  font-family: var(--font-serif);
  letter-spacing: 0.5px;
}

/* ---------------- 文章详情浮窗 ---------------- */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(16, 23, 37, 0.55);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.overlay.open { display: flex; opacity: 1; }

.modal {
  background: var(--bg);
  width: min(680px, 100%);
  max-height: 88vh;
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(12px);
  transition: transform 0.4s var(--ease);
}
.overlay.open .modal { transform: scale(1) translateY(0); }

.modal-close {
  position: absolute;
  top: 14px; right: 16px;
  z-index: 5;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--ink-soft);
  width: 40px; height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  display: grid; place-items: center;
  transition: var(--transition);
}
.modal-close:hover { color: #fff; background: var(--accent-ice-deep); transform: rotate(90deg); }

.modal-body { padding: 42px 44px 50px; overflow-y: auto; max-height: 88vh; scrollbar-width: thin; }
.modal-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2rem);
  color: var(--ink);
  margin-bottom: 10px;
  line-height: 1.35;
}
.modal-meta {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 28px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.modal-content p {
  color: var(--ink-soft);
  font-size: 1.04rem;
  margin-bottom: 18px;
  line-height: 1.95;
}
.modal-content h3 {
  font-size: 1.25rem;
  color: var(--ink);
  margin: 30px 0 14px;
}
.modal-content blockquote {
  border-left: 4px solid var(--accent-ice);
  background: rgba(158, 196, 231, 0.11);
  padding: 16px 22px;
  margin: 22px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink);
  font-style: italic;
  line-height: 1.9;
}
.modal-tags { margin-top: 30px; display: flex; gap: 8px; flex-wrap: wrap; }
.modal-tags span {
  background: rgba(93, 127, 174, 0.14);
  color: var(--accent-blue-deep);
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
}

/* ---------------- 回到顶部 ---------------- */
.back-top {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-blue-deep));
  color: #fff;
  font-size: 1.2rem;
  box-shadow: 0 8px 20px rgba(36, 62, 99, 0.42);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: var(--transition);
  z-index: 90;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-3px); box-shadow: 0 12px 26px rgba(36, 62, 99, 0.5); }

/* 滚动进度条 */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-ice), var(--accent-blue));
  z-index: 120;
  transition: width 0.1s linear;
}

/* 滚动揭示动画（仅在 JS 就绪时隐藏，保证无 JS 也能显示） */
body.js-ready .reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
body.js-ready .reveal.in { opacity: 1; transform: none; }

/* 焦点可见性（无障碍） */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------------- 响应式适配 ---------------- */
@media (max-width: 900px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .about-inner { flex-direction: column; text-align: center; gap: 32px; }
  .about-text .section-title::after { left: 50%; transform: translateX(-50%); }
  .scroll-cue { display: none; }
}

@media (max-width: 680px) {
  .hero { padding-top: 120px; }
  .hero-inner { flex-direction: column; text-align: center; gap: 14px; }
  .hero-subtag { margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .hero-illus { width: 200px; height: 200px; margin-top: 18px; }
  .hero-name { font-size: 2.2rem; }

  .main-nav {
    position: fixed;
    top: 70px; right: 0;
    background: rgba(23, 35, 59, 0.96);
    flex-direction: column;
    width: 220px;
    padding: 30px;
    box-shadow: var(--shadow-lg);
    gap: 10px;
    transform: translateX(100%);
    transition: var(--transition);
    border-radius: 0 0 0 var(--radius);
  }
  .main-nav.open { transform: translateX(0); }
  .nav-toggle { display: flex; }

  .blog-grid { grid-template-columns: 1fr; }
  .contact-ways { grid-template-columns: 1fr; }
  .modal-body { padding: 32px 24px 40px; }
  .section { padding: 64px 0; }
}

@media (max-width: 900px) and (min-width: 681px) {
  .contact-ways { grid-template-columns: 1fr 1fr; }
  .contact-item:last-child { grid-column: span 2; }
}

/* 尊重无障碍偏好：减少动效 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  body.js-ready .reveal { opacity: 1; transform: none; }
}