/* ============================================================
   个人作品集 · 现代编辑风设计系统
   简约 / 温暖 / 专业
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  /* 亮色主题 */
  --bg: #faf8f4;
  --bg-soft: #f1ede4;
  --surface: #ffffff;
  --ink: #1e1b16;
  --ink-2: #4a443c;
  --muted: #8a8378;
  --accent: #de5b2a;
  --accent-soft: #f7e3d8;
  --line: #e7e1d6;
  --line-strong: #d8d0c2;
  --shadow-sm: 0 2px 10px rgba(30, 27, 22, 0.06);
  --shadow-md: 0 12px 40px rgba(30, 27, 22, 0.1);
  --radius: 16px;
  --radius-sm: 10px;

  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, "Segoe UI", Roboto, sans-serif;

  --header-h: 68px;
  --maxw: 1160px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme="dark"] {
  --bg: #16140f;
  --bg-soft: #1e1b14;
  --surface: #221f17;
  --ink: #f2eee4;
  --ink-2: #b9b2a4;
  --muted: #837c6f;
  --accent: #f07a45;
  --accent-soft: #3a2418;
  --line: #322d22;
  --line-strong: #453e30;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 14px 44px rgba(0, 0, 0, 0.5);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
::selection { background: var(--accent); color: #fff; }

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

/* ---------- 排版 ---------- */
h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 700; line-height: 1.25; letter-spacing: 0.01em; }

.section { padding: 88px 0; }
.section--soft { background: var(--bg-soft); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.16em;
  color: var(--accent); text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--accent); }

.sec-head { max-width: 640px; margin-bottom: 52px; }
.sec-head h2 { font-size: clamp(28px, 4vw, 40px); margin: 14px 0 12px; }
.sec-head p { color: var(--ink-2); font-size: 16px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head.center .eyebrow { justify-content: center; }
.sec-head.center .eyebrow::after { content: ""; width: 26px; height: 2px; background: var(--accent); }

.lead { font-size: 18px; color: var(--ink-2); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px;
  font-size: 15px; font-weight: 600; line-height: 1;
  border: 1px solid var(--line-strong);
  color: var(--ink); background: var(--surface);
  transition: all 0.28s var(--ease);
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--ink); border-color: var(--ink); color: var(--bg); box-shadow: var(--shadow-md); }
.btn--ghost { background: transparent; }
.btn .arrow { transition: transform 0.28s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-serif); font-weight: 700; font-size: 20px; letter-spacing: 0.02em; }
.brand .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); flex: none; }

.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a {
  position: relative; padding: 8px 16px; border-radius: 999px;
  font-size: 15px; font-weight: 500; color: var(--ink-2);
  transition: color 0.25s var(--ease);
}
.site-nav a:hover { color: var(--ink); }
.site-nav a.active { color: var(--ink); }
.site-nav a.active::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 2px;
  height: 2px; background: var(--accent); border-radius: 2px;
}

.header-actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  width: 40px; height: 40px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line-strong); color: var(--ink-2);
  transition: all 0.25s var(--ease);
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }

/* 汉堡菜单 */
.burger { display: none; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 56px 0 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 40px; margin-bottom: 44px; }
.footer-brand p { color: var(--muted); font-size: 14px; margin-top: 12px; max-width: 320px; }
.footer-col h4 { font-family: var(--font-sans); font-size: 13px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
.footer-col a { display: block; padding: 5px 0; color: var(--ink-2); font-size: 14px; transition: color 0.2s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--line); padding-top: 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  color: var(--muted); font-size: 13px;
}
.footer-social { display: flex; gap: 10px; }

/* ============================================================
   首页
   ============================================================ */

/* Hero */
.hero { padding: 96px 0 72px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; top: -220px; right: -160px;
  width: 560px; height: 560px; border-radius: 50%;
  background: radial-gradient(circle, var(--accent-soft), transparent 68%);
  z-index: 0; pointer-events: none;
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 64px; align-items: center;
}
.hero .greet { color: var(--accent); font-weight: 600; font-size: 15px; letter-spacing: 0.08em; margin-bottom: 16px; }
.hero h1 { font-size: clamp(36px, 5.6vw, 60px); line-height: 1.14; margin-bottom: 20px; }
.hero h1 em { font-style: normal; color: var(--accent); position: relative; }
.hero h1 em::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 4px; height: 10px;
  background: var(--accent-soft); z-index: -1; border-radius: 4px;
}
.hero .sub { font-size: 17px; color: var(--ink-2); max-width: 520px; margin-bottom: 32px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }

.hero-meta { display: flex; gap: 40px; border-top: 1px solid var(--line); padding-top: 28px; }
.hero-meta .num { font-family: var(--font-serif); font-size: 30px; font-weight: 700; color: var(--ink); }
.hero-meta .lbl { font-size: 13px; color: var(--muted); margin-top: 2px; }

/* 头像卡 */
.avatar-card { position: relative; justify-self: center; }
.avatar-wrap {
  position: relative; width: 300px; height: 420px; border-radius: 24px;
  overflow: hidden; border: 6px solid var(--surface);
  box-shadow: var(--shadow-md);
  background: var(--bg-soft);
}
.avatar-wrap img { width: 100%; height: 100%; object-fit: contain; object-position: center; }
.avatar-card .ring {
  position: absolute; inset: -22px; border-radius: 28px;
  border: 1px dashed var(--line-strong);
  animation: spin 40s linear infinite;
}
.avatar-card .tag {
  position: absolute; left: 50%; bottom: 4px; transform: translateX(-50%);
  background: var(--ink); color: var(--bg);
  font-size: 13px; font-weight: 600; padding: 8px 18px; border-radius: 999px;
  white-space: nowrap; box-shadow: var(--shadow-md);
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 社交链接（Hero 与页脚共用） */
.social-row { display: flex; gap: 10px; margin-top: 28px; }
.social-row .icon-btn { width: 44px; height: 44px; }

/* 专长卡片 */
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.course-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 28px;
  transition: all 0.35s var(--ease);
}
.course-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--line-strong); }
.course-card .ic {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft); color: var(--accent); margin-bottom: 20px;
}
.course-card h3 { font-size: 20px; margin-bottom: 10px; }
.course-card p { font-size: 14.5px; color: var(--ink-2); }
.course-card .meta { margin-top: 16px; display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  font-size: 12px; color: var(--ink-2); border: 1px solid var(--line-strong);
  padding: 3px 10px; border-radius: 999px;
}

/* 关于我 */
.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 64px; align-items: start; }
.about-aside { position: sticky; top: calc(var(--header-h) + 32px); }
.about-aside .quote {
  font-family: var(--font-serif); font-size: 24px; line-height: 1.5;
  border-left: 3px solid var(--accent); padding-left: 22px; color: var(--ink);
}
.about-aside .who { margin-top: 18px; font-size: 14px; color: var(--muted); }
.about-body p { color: var(--ink-2); margin-bottom: 18px; }
.about-body strong { color: var(--ink); }
.about-list li { display: flex; gap: 12px; padding: 10px 0; border-bottom: 1px dashed var(--line); color: var(--ink-2); font-size: 15px; }
.about-list li::before { content: "→"; color: var(--accent); font-weight: 700; flex: none; }
.about-list { margin-top: 8px; }

/* 案例卡 */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.case-card {
  display: block; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  transition: all 0.35s var(--ease);
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.case-cover { height: 190px; display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; }
.case-cover .big { font-family: var(--font-serif); font-size: 56px; font-weight: 700; color: #fff; }
.case-cover .deco { position: absolute; inset: 0; opacity: 0.16; background-image: radial-gradient(circle at 20% 30%, #fff 2px, transparent 2.5px); background-size: 26px 26px; }
.case-body { padding: 26px 28px 30px; }
.case-body .case-tag { font-size: 12px; font-weight: 600; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; }
.case-body h3 { font-size: 21px; margin: 8px 0 10px; }
.case-body p { font-size: 14.5px; color: var(--ink-2); }
.case-body .case-meta { margin-top: 16px; font-size: 13px; color: var(--muted); display: flex; gap: 18px; flex-wrap: wrap; }
.case-body .case-meta span { display: inline-flex; align-items: center; gap: 6px; }

/* 数字横幅 */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.stat {
  text-align: center; padding: 34px 16px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
}
.stat .num { font-family: var(--font-serif); font-size: 42px; font-weight: 700; color: var(--accent); line-height: 1.1; }
.stat .lbl { font-size: 14px; color: var(--ink-2); margin-top: 6px; }

/* 博客卡（首页与博客页共用） */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.post-card {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 26px 28px;
  transition: all 0.35s var(--ease);
}
.post-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.post-card .cat { font-size: 12px; font-weight: 600; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; }
.post-card h3 { font-size: 18.5px; margin: 10px 0; line-height: 1.45; }
.post-card h3 a:hover { color: var(--accent); }
.post-card .excerpt { font-size: 14px; color: var(--ink-2); flex: 1; }
.post-card .date { margin-top: 18px; font-size: 13px; color: var(--muted); }

/* CTA 区 */
.cta-band {
  background: var(--ink); color: var(--bg);
  border-radius: 24px; padding: 64px 56px; position: relative; overflow: hidden;
}
html[data-theme="dark"] .cta-band { background: var(--surface); border: 1px solid var(--line); color: var(--ink); }
.cta-band::after {
  content: ""; position: absolute; right: -60px; top: -60px; width: 240px; height: 240px;
  border-radius: 50%; background: var(--accent); opacity: 0.14;
}
.cta-band h2 { font-size: clamp(26px, 3.6vw, 38px); margin-bottom: 14px; }
.cta-band p { color: var(--muted); max-width: 520px; margin-bottom: 30px; }
.cta-band .btn--primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ============================================================
   作品集页
   ============================================================ */
.page-hero { padding: 72px 0 24px; }
.page-hero h1 { font-size: clamp(32px, 4.6vw, 48px); margin: 14px 0 14px; }
.page-hero p { color: var(--ink-2); max-width: 620px; }

.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin: 40px 0 36px; }
.filter-btn {
  padding: 9px 20px; border-radius: 999px; font-size: 14px; font-weight: 500;
  border: 1px solid var(--line-strong); color: var(--ink-2); transition: all 0.25s var(--ease);
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.on { background: var(--ink); border-color: var(--ink); color: var(--bg); }
html[data-theme="dark"] .filter-btn.on { background: var(--accent); border-color: var(--accent); color: #fff; }

/* 项目列表（作品集） */
.work-list { display: grid; gap: 20px; }
.work-item {
  display: grid; grid-template-columns: 220px 1fr auto; gap: 28px; align-items: center;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 26px;
  transition: all 0.35s var(--ease);
}
.work-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.work-thumb {
  height: 130px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif); font-size: 40px; font-weight: 700; color: #fff; position: relative; overflow: hidden;
}
.work-thumb .deco { position: absolute; inset: 0; opacity: 0.15; background-image: radial-gradient(circle at 30% 30%, #fff 2px, transparent 2.5px); background-size: 22px 22px; }
.work-item h3 { font-size: 21px; margin-bottom: 8px; }
.work-item p { font-size: 14.5px; color: var(--ink-2); }
.work-item .tags { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.work-arrow { color: var(--muted); transition: all 0.25s var(--ease); }
.work-item:hover .work-arrow { color: var(--accent); transform: translateX(4px); }

/* 客户评价 */
.testi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.testi {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px; display: flex; flex-direction: column;
}
.testi .stars { color: var(--accent); font-size: 15px; letter-spacing: 3px; margin-bottom: 16px; }
.testi p { font-size: 14.5px; color: var(--ink-2); flex: 1; font-style: italic; }
.testi .who { margin-top: 20px; display: flex; align-items: center; gap: 12px; }
.testi .ava { width: 42px; height: 42px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); display: flex; align-items: center; justify-content: center; font-weight: 700; font-family: var(--font-serif); flex: none; }
.testi .who b { display: block; font-size: 14.5px; }
.testi .who span { font-size: 12.5px; color: var(--muted); }

/* ============================================================
   博客页
   ============================================================ */
.blog-layout { display: grid; grid-template-columns: 1fr 300px; gap: 48px; align-items: start; }
.post-list { display: grid; gap: 20px; }
.post-row {
  display: grid; grid-template-columns: 150px 1fr; gap: 24px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 26px; transition: all 0.3s var(--ease);
}
.post-row:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.post-row .d { font-family: var(--font-serif); text-align: center; align-self: start; padding-top: 4px; }
.post-row .d .day { font-size: 34px; font-weight: 700; color: var(--accent); line-height: 1.1; }
.post-row .d .ym { font-size: 12.5px; color: var(--muted); margin-top: 4px; }
.post-row .cat { font-size: 12px; font-weight: 600; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; }
.post-row h3 { font-size: 20px; margin: 8px 0 8px; }
.post-row h3 a:hover { color: var(--accent); }
.post-row p { font-size: 14.5px; color: var(--ink-2); }

.sidebar { position: sticky; top: calc(var(--header-h) + 32px); display: grid; gap: 24px; }
.side-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.side-card h4 { font-family: var(--font-sans); font-size: 13px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud a { font-size: 13px; padding: 5px 13px; border-radius: 999px; border: 1px solid var(--line-strong); color: var(--ink-2); transition: all 0.2s; }
.tag-cloud a:hover { border-color: var(--accent); color: var(--accent); }

/* ============================================================
   文章详情页
   ============================================================ */
.article-wrap { max-width: 780px; margin: 0 auto; }
.article-head { padding: 64px 0 40px; text-align: center; }
.article-head .cat { display: inline-block; font-size: 12.5px; font-weight: 600; color: var(--accent); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 18px; }
.article-head h1 { font-size: clamp(30px, 4.4vw, 44px); margin-bottom: 20px; }
.article-head .byline { font-size: 14px; color: var(--muted); display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.article-head .byline span { display: inline-flex; align-items: center; gap: 6px; }

.article-body {
  font-size: 16.5px; color: var(--ink-2); line-height: 1.95;
  border-top: 1px solid var(--line); padding-top: 40px;
}
.article-body h2 { font-size: 26px; color: var(--ink); margin: 44px 0 16px; }
.article-body h3 { font-size: 21px; color: var(--ink); margin: 34px 0 12px; }
.article-body p { margin-bottom: 20px; }
.article-body strong { color: var(--ink); }
.article-body ul, .article-body ol { margin: 0 0 20px; padding-left: 4px; }
.article-body li { position: relative; padding-left: 26px; margin-bottom: 10px; }
.article-body ul li::before { content: "◆"; position: absolute; left: 0; top: 0; font-size: 11px; color: var(--accent); }
.article-body ol { counter-reset: li; }
.article-body ol li { counter-increment: li; }
.article-body ol li::before { content: counter(li) "."; position: absolute; left: 0; font-weight: 700; color: var(--accent); }
.article-body blockquote {
  border-left: 3px solid var(--accent); background: var(--bg-soft);
  padding: 20px 24px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-family: var(--font-serif); font-size: 18px; color: var(--ink); margin: 28px 0;
}
.article-body blockquote cite { display: block; font-family: var(--font-sans); font-size: 13px; color: var(--muted); font-style: normal; margin-top: 10px; }
.article-body .tip {
  background: var(--accent-soft); border-radius: var(--radius-sm);
  padding: 18px 22px; margin: 24px 0; font-size: 15px; color: var(--ink);
}
.article-body .tip b { color: var(--accent); }

.article-tags { display: flex; gap: 8px; flex-wrap: wrap; margin: 40px 0; }
.article-tags a { font-size: 13px; padding: 5px 14px; border-radius: 999px; border: 1px solid var(--line-strong); color: var(--ink-2); }
.article-tags a:hover { border-color: var(--accent); color: var(--accent); }

.article-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
  border-top: 1px solid var(--line); padding-top: 36px; margin-top: 8px;
}
.article-nav a {
  padding: 20px 24px; border: 1px solid var(--line); border-radius: var(--radius);
  transition: all 0.3s var(--ease);
}
.article-nav a:hover { border-color: var(--accent); transform: translateY(-3px); }
.article-nav .dir { font-size: 12.5px; color: var(--muted); display: block; margin-bottom: 6px; }
.article-nav b { font-family: var(--font-serif); font-size: 16px; }
.article-nav a.next { text-align: right; }

/* ============================================================
   联系页
   ============================================================ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.contact-item {
  display: flex; gap: 18px; padding: 22px 0; border-bottom: 1px dashed var(--line); align-items: flex-start;
}
.contact-item .ic {
  width: 48px; height: 48px; border-radius: 12px; flex: none;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft); color: var(--accent);
}
.contact-item b { display: block; font-size: 16px; margin-bottom: 4px; }
.contact-item span, .contact-item a { font-size: 14.5px; color: var(--ink-2); }
.contact-item a:hover { color: var(--accent); }

.form-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 34px; }
.form-card h3 { font-size: 24px; margin-bottom: 8px; }
.form-card > p { font-size: 14.5px; color: var(--muted); margin-bottom: 26px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 8px; color: var(--ink-2); }
.field input, .field textarea, .field select {
  width: 100%; padding: 13px 16px; font-family: inherit; font-size: 15px;
  background: var(--bg); color: var(--ink); border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm); transition: all 0.25s var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.field textarea { min-height: 140px; resize: vertical; }

/* 弹窗（微信二维码） */
.modal-mask {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(20, 17, 12, 0.55); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 0.3s var(--ease);
  padding: 24px;
}
.modal-mask.open { opacity: 1; pointer-events: auto; }
.modal {
  background: var(--surface); border-radius: 20px; padding: 36px;
  max-width: 360px; width: 100%; text-align: center;
  transform: translateY(20px) scale(0.96); transition: transform 0.35s var(--ease);
  border: 1px solid var(--line);
}
.modal-mask.open .modal { transform: translateY(0) scale(1); }
.modal .qr-box {
  width: 190px; height: 190px; margin: 20px auto;
  border-radius: 14px; overflow: hidden; border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  background: #fff;
}
.modal .qr-box svg { width: 100%; height: 100%; }
.modal .qr-box img { width: 100%; height: 100%; object-fit: contain; }
.modal h3 { font-size: 22px; margin-bottom: 6px; }
.modal p { font-size: 14px; color: var(--muted); margin-bottom: 4px; }
.modal .note { font-size: 12.5px; color: var(--accent); font-weight: 600; }
.modal .close {
  margin-top: 18px; padding: 10px 34px; border-radius: 999px;
  border: 1px solid var(--line-strong); font-size: 14px; color: var(--ink-2);
  transition: all 0.25s;
}
.modal .close:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- 入场与滚动动效 ---------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: translateY(0); }
}
.rise { opacity: 0; }
.rise.in { animation: rise 0.75s var(--ease) forwards; }
.d1 { animation-delay: 0.08s; } .d2 { animation-delay: 0.16s; } .d3 { animation-delay: 0.24s; }
.d4 { animation-delay: 0.32s; } .d5 { animation-delay: 0.4s; } .d6 { animation-delay: 0.48s; }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* 页面顶部返回 */
.back-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--ink); color: var(--bg);
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md); opacity: 0; pointer-events: none;
  transition: all 0.3s var(--ease);
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--accent); color: #fff; transform: translateY(-3px); }

/* 404 */
.err-code { font-family: var(--font-serif); font-size: 120px; font-weight: 700; color: var(--accent); line-height: 1; text-align: center; margin-top: 80px; }
.err-msg { text-align: center; color: var(--ink-2); margin: 20px 0 40px; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 56px; }
  .hero { padding: 72px 0 56px; }
  .hero-meta { justify-content: flex-start; }
  .avatar-card { order: -1; }
  .avatar-wrap { width: 240px; height: 240px; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .about-aside { position: static; }
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .post-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; grid-template-columns: repeat(2, 1fr); }
  .work-item { grid-template-columns: 160px 1fr auto; }
  .testi-grid { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .section { padding: 64px 0; }
  .container { padding: 0 20px; }

  /* 导航折叠 */
  .burger { display: inline-flex; }
  .site-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 12px 20px 20px;
    transform: translateY(-16px); opacity: 0; pointer-events: none;
    transition: all 0.3s var(--ease);
  }
  .site-nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .site-nav a { padding: 14px 8px; border-radius: 10px; font-size: 17px; }
  .site-nav a.active::after { display: none; }
  .site-nav a.active { color: var(--accent); background: var(--accent-soft); }

  .hero h1 { font-size: 34px; }
  .hero-meta { gap: 26px; }
  .hero-meta .num { font-size: 24px; }

  .course-grid, .post-grid, .testi-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .form-row { grid-template-columns: 1fr; }
  .work-item { grid-template-columns: 1fr; gap: 16px; }
  .work-arrow { display: none; }
  .post-row { grid-template-columns: 1fr; gap: 12px; }
  .post-row .d { text-align: left; display: flex; align-items: baseline; gap: 10px; }
  .post-row .d .day { font-size: 26px; }
  .cta-band { padding: 44px 30px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .article-nav { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .stat .num { font-size: 34px; }
}

/* 无障碍：减少动效 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}