/* =========================================================
   张勇 · 前端工程师作品集 —— Liquid Glass 主题
   视觉语言：iOS 液态玻璃 · 暗夜氛围光 · 克制的交互反馈
   ========================================================= */
:root{
  /* 底色与氛围 */
  --bg:#070b16;
  --bg-2:#0d1526;
  --orb-1:rgba(78,110,255,.55);
  --orb-2:rgba(56,189,248,.42);
  --orb-3:rgba(192,132,252,.35);

  /* 文字 */
  --txt:#eef2ff;
  --muted:#9aa6c6;
  --faint:#5f6d92;
  --accent:#8ab6ff;

  /* 渐变 */
  --g1:#5b8cff;
  --g2:#4cc9f0;
  --pink:#e879f9;
  --grad:linear-gradient(96deg,#5b8cff,#4cc9f0);

  /* 玻璃 */
  --glass-bd:rgba(255,255,255,.14);
  --glass-bd-2:rgba(255,255,255,.22);
  --glass-hi:rgba(255,255,255,.16);
  --glass-lo:rgba(255,255,255,.02);
  --glass-bg:
    radial-gradient(130% 90% at 15% -10%,rgba(255,255,255,.20),rgba(255,255,255,0) 46%),
    linear-gradient(155deg,rgba(255,255,255,.085),rgba(255,255,255,.025) 34%,rgba(255,255,255,.055) 62%,rgba(255,255,255,.02));
  --glass-sh:inset 0 1px 0 rgba(255,255,255,.24),inset 0 -1px 0 rgba(255,255,255,.05),0 22px 55px -30px rgba(0,0,0,.75);
  --blur:blur(26px) saturate(1.7);

  --ok:#4ade80;
  --r-lg:22px;
  --r-md:16px;
  --r-sm:11px;
  --shadow:0 22px 55px -30px rgba(0,0,0,.75);

  --font:-apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Roboto,"Segoe UI",sans-serif;
  --mono:"SF Mono","Cascadia Code","JetBrains Mono",ui-monospace,Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
html,body{overflow-x:hidden}
body{
  font-family:var(--font);
  background:
    radial-gradient(80% 55% at 20% -8%,rgba(76,110,255,.14),transparent 60%),
    radial-gradient(60% 40% at 100% 8%,rgba(76,201,240,.09),transparent 60%),
    linear-gradient(180deg,var(--bg) 0%,#0a0f1e 55%,var(--bg) 100%);
  color:var(--txt);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:rgba(139,178,255,.35)}
a{color:inherit;text-decoration:none}
/* 移动端去除所有可点击元素的默认高亮底色（点击反馈仍由各 :active 规则提供） */
a,button,[role="button"],.filter-btn,.w-card{-webkit-tap-highlight-color:transparent}
.w-card:active{filter:brightness(1.07)}
b,strong{font-weight:700}
img{display:block;max-width:100%}
button{font-family:inherit}
ul,ol{list-style:none}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:rgba(130,150,200,.32);border-radius:8px;border:2px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:rgba(150,170,220,.5);background-clip:content-box;border:2px solid transparent}
::-webkit-scrollbar-track{background:transparent}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
@media (pointer:fine){
  ::-webkit-scrollbar{width:9px}
}

/* ---------- 背景氛围 ---------- */
.bg-scene{position:fixed;inset:0;z-index:-2;overflow:hidden;pointer-events:none}
.bg-scene::after{ /* 细颗粒：给玻璃一点可折射的质感 */
  content:"";position:absolute;inset:0;opacity:.5;
  background-image:radial-gradient(rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:3px 3px;
}
.orb{position:absolute;border-radius:50%;filter:blur(90px);will-change:transform;opacity:.8}
.orb-a{width:560px;height:560px;left:-160px;top:-180px;background:radial-gradient(circle at 30% 30%,var(--orb-1),transparent 70%);animation:drift-a 26s ease-in-out infinite alternate}
.orb-b{width:520px;height:520px;right:-170px;top:16%;background:radial-gradient(circle at 60% 40%,var(--orb-2),transparent 70%);animation:drift-b 30s ease-in-out infinite alternate}
.orb-c{width:640px;height:640px;left:26%;bottom:-330px;background:radial-gradient(circle at 45% 55%,var(--orb-3),transparent 72%);animation:drift-c 34s ease-in-out infinite alternate}
@keyframes drift-a{to{transform:translate(70px,50px)}}
@keyframes drift-b{to{transform:translate(-60px,40px)}}
@keyframes drift-c{to{transform:translate(40px,-60px)}}

/* ---------- 玻璃通用 ---------- */
.glass{
  border:1px solid var(--glass-bd);
  background:var(--glass-bg);
  box-shadow:var(--glass-sh);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
}
.sec-kicker{
  font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);display:flex;align-items:center;gap:12px;margin-bottom:14px;
}
.sec-kicker::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,transparent,var(--accent))}
.sec-title{font-size:clamp(30px,4.2vw,44px);font-weight:800;letter-spacing:-.03em;line-height:1.15}

/* 光标高光点（液体玻璃的镜面反馈） */
.spot-card{position:relative}
.spot{
  position:absolute;inset:0;z-index:1;pointer-events:none;border-radius:inherit;
  background:radial-gradient(260px circle at var(--mx,50%) var(--my,-20%),rgba(255,255,255,.14),transparent 62%);
  opacity:0;transition:opacity .5s ease;
}
.spot-card:hover .spot,.spot-card:focus-within .spot{opacity:1}
.spot-card>*{position:relative;z-index:2}

/* ---------- 顶部导航：左侧 LOGO + 右侧局部玻璃胶囊 ---------- */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:18px clamp(18px,4vw,40px);pointer-events:none;
}
/* Logo 玻璃徽章：独立背景/描边/投影/圆角，叠加在内容上时也能清晰识别 */
.logo{
  display:flex;align-items:center;pointer-events:auto;flex-shrink:0;line-height:1;
  padding:9px 16px;border-radius:16px;
  background:var(--glass-bg);border:1px solid var(--glass-bd);
  box-shadow:var(--glass-sh);
  backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);
  transition:transform .35s cubic-bezier(.2,.8,.3,1.2),border-color .35s,box-shadow .35s;
}
.logo:hover{transform:translateY(-1px);border-color:rgba(255,255,255,.32)}
.logo-mark{display:none}
/* 文字 Logo：白→浅蓝渐变字 + 青色圆点收尾，呼应导航胶囊与整体玻璃质感 */
.logo-text{
  font-family:var(--mono);font-size:19px;font-weight:800;letter-spacing:.05em;line-height:1;
  display:inline-flex;align-items:baseline;white-space:nowrap;
  background:linear-gradient(96deg,#fff 25%,#a9c6ff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  transition:filter .35s ease,transform .35s cubic-bezier(.2,.8,.3,1.2);
}
.logo:hover .logo-text{filter:brightness(1.12) drop-shadow(0 2px 12px rgba(91,140,255,.45))}
.logo-text b{font-family:var(--font);font-weight:800}
.logo-text em{font-style:normal;font-weight:800;color:var(--g2);-webkit-text-fill-color:var(--g2);transform:translateY(-.5px)}
@media (max-width:560px){
  .logo{padding:7px 12px;border-radius:14px}
  .logo-text{font-size:16.5px;letter-spacing:.04em}
}
/* 圆角与移动端 .nav 下拉面板统一为 26px，视觉语言一致 */
.top-pill{
  position:relative;display:flex;align-items:center;gap:4px;
  padding:6px 6px 6px 6px;border-radius:26px;pointer-events:auto;
}
.nav{display:flex;gap:2px}
.nav a{
  position:relative;padding:9px 18px;font-size:14.5px;color:var(--muted);
  border-radius:999px;transition:color .3s,background .3s;white-space:nowrap;
}
.nav a:hover{color:var(--txt);background:rgba(255,255,255,.07)}
.nav a.active{color:var(--txt)}
.nav a.active::after{
  content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:3px;
  width:18px;height:2px;border-radius:2px;background:var(--grad);
}
.burger{
  display:none;flex-direction:column;justify-content:center;align-items:center;gap:5px;
  width:42px;height:42px;border-radius:50%;cursor:pointer;
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);
  -webkit-tap-highlight-color:transparent; /* 去除移动端点按的灰色高亮闪烁 */
}
.burger:active{background:rgba(255,255,255,.07)} /* 点击前后样式一致 */
.burger i{width:16px;height:2px;background:var(--txt);border-radius:2px;transition:.3s}
.burger.open i:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open i:nth-child(2){opacity:0}
.burger.open i:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- HERO（居中简介） ---------- */
.hero{
  position:relative;min-height:100svh;display:flex;align-items:center;justify-content:center;
  padding:140px 20px 100px;overflow:clip;
}
.hero-inner{max-width:840px;width:100%;display:flex;flex-direction:column;align-items:center;text-align:center}
.hero-eyebrow{margin-bottom:30px}
.eyebrow-chip{
  display:inline-flex;align-items:center;gap:10px;padding:9px 18px;border-radius:999px;
  font-size:13.5px;color:var(--muted);
}
.eyebrow-chip a{color:var(--accent);margin-left:4px}
.eyebrow-chip a:hover{text-decoration:underline;text-underline-offset:4px}
.pulse-dot{width:7px;height:7px;border-radius:50%;background:var(--ok);position:relative}
.pulse-dot::after{content:"";position:absolute;inset:-4px;border-radius:50%;border:1px solid var(--ok);opacity:.6;animation:ping 2.2s ease-out infinite}
@keyframes ping{0%{transform:scale(.5);opacity:.8}80%,100%{transform:scale(1.4);opacity:0}}
.hero-sub{
  font-size:clamp(19px,2.5vw,28px);line-height:1.9;color:var(--muted);
  max-width:660px;margin-bottom:44px;
}
.hero-sub b{color:var(--txt)}
.hero-sub [data-fill]{color:var(--txt);font-weight:600}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:14px 28px;border-radius:999px;
  font-size:15.5px;font-weight:600;cursor:pointer;transition:transform .3s cubic-bezier(.2,.8,.3,1.2),box-shadow .3s,background .3s,border-color .3s;
  border:1px solid transparent;white-space:nowrap;
}
.btn-primary{background:linear-gradient(96deg,#4d7bff,#3fb6e8 90%);color:#fff;box-shadow:0 12px 34px -10px rgba(80,130,255,.6),inset 0 1px 0 rgba(255,255,255,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 44px -12px rgba(80,130,255,.75),inset 0 1px 0 rgba(255,255,255,.4)}
.btn-primary:active{transform:translateY(0) scale(.985)}
.btn-primary .btn-arrow{transition:transform .3s}
.btn-primary:hover .btn-arrow{transform:translateX(4px)}
.btn-ghost{color:var(--txt);border-color:var(--glass-bd-2);background:rgba(255,255,255,.04)}
.btn-ghost:hover{transform:translateY(-2px);border-color:rgba(255,255,255,.34);background:rgba(255,255,255,.08)}
.btn-ico{width:17px;height:17px;fill:currentColor}

/* ---------- Section 通用 ---------- */
/* 桌面端主内容加宽，充分使用横向空间；侧边距随屏宽适度留白 */
.section{max-width:1540px;margin:0 auto;padding:120px clamp(24px,2.5vw,44px)}
.sec-head{margin-bottom:48px;max-width:640px}
.sec-head .sec-desc,.sec-desc{margin-top:16px;color:var(--muted);font-size:15.5px;line-height:1.8}
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1);transition-delay:var(--d,0s)}
.reveal.in{opacity:1;transform:none}

/* ---------- 能力卡片 ---------- */
.skills-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.skill-card{
  padding:30px 24px 26px;border-radius:var(--r-lg);overflow:hidden;
  transition:transform .45s cubic-bezier(.2,.8,.25,1.2),box-shadow .45s,border-color .35s;
}
.skill-card:hover{transform:translateY(-6px);border-color:rgba(255,255,255,.28);box-shadow:inset 0 1px 0 rgba(255,255,255,.24),inset 0 -1px 0 rgba(255,255,255,.05),0 30px 60px -28px rgba(70,110,255,.5)}
.skill-ico{
  width:46px;height:46px;display:grid;place-items:center;border-radius:14px;margin-bottom:20px;
  color:#fff;box-shadow:inset 0 1px 0 rgba(255,255,255,.35);
}
.skill-ico svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.s1{background:linear-gradient(140deg,#5b8cff,#3a5fe0)}.s2{background:linear-gradient(140deg,#4cc9f0,#2d8fd8)}
.s3{background:linear-gradient(140deg,#a78bfa,#7c5cf0)}.s4{background:linear-gradient(140deg,#f472b6,#d94fa0)}
.skill-card h3{font-size:18.5px;font-weight:700;margin-bottom:9px;letter-spacing:-.01em}
.skill-card p{color:var(--muted);font-size:14px;line-height:1.75;margin-bottom:18px}
.chip-row{display:flex;flex-wrap:wrap;gap:8px}
.chip-row i{
  font-style:normal;font-size:12px;padding:4px 12px;border-radius:999px;
  border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.04);color:var(--muted);
  transition:.3s;
}
.skill-card:hover .chip-row i{color:var(--accent);border-color:rgba(139,178,255,.35)}

/* ---------- 筛选 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px}
.filter-btn{
  display:inline-flex;align-items:center;gap:8px;padding:9px 18px;border-radius:999px;cursor:pointer;
  font-size:14px;color:var(--muted);border:1px solid rgba(255,255,255,.13);
  background:rgba(255,255,255,.045);transition:.3s;backdrop-filter:blur(8px);
}
.filter-btn .n{font-family:var(--mono);font-size:11px;opacity:.75}
.filter-btn:hover{color:var(--txt);transform:translateY(-1px);border-color:rgba(255,255,255,.3)}
.filter-btn.on{
  color:#fff;font-weight:600;border-color:transparent;
  background:linear-gradient(96deg,#4d7bff,#3fb6e8);
  box-shadow:0 8px 24px -8px rgba(80,130,255,.6),inset 0 1px 0 rgba(255,255,255,.35);
}
/* 按项目筛选（与类型标签共存、AND 叠加） */
.filter-bar+.filter-bar{margin-top:14px}
.filter-bar--alt .filter-btn{
  font-size:13px;padding:7px 14px;color:#e5c7ff;
  border-color:rgba(232,121,249,.22);background:rgba(232,121,249,.06);
}
.filter-bar--alt .filter-btn .n{color:#f3d5ff;opacity:.85}
.filter-bar--alt .filter-btn:hover{color:#fff;border-color:rgba(232,121,249,.55);background:rgba(232,121,249,.12)}
.filter-bar--alt .filter-btn.on{
  color:#fff;background:linear-gradient(96deg,#a35cff,#e879f9);
  box-shadow:0 10px 26px -10px rgba(232,121,249,.65),inset 0 1px 0 rgba(255,255,255,.4);
}
/* 卡片上的项目标记 */
.w-tag.tag-project{
  color:#f3d5ff;background:rgba(232,121,249,.12);
  border-color:rgba(232,121,249,.34);font-weight:600;
}
.works-count{color:var(--faint);font-size:13px;margin:18px 4px 24px;font-family:var(--mono)}

/* ---------- 作品瀑布流 ----------
   默认多列样式仅作降级兜底；JS 加载后为 #works-grid 追加 .js-masonry，
   改用“最短列”算法逐张定位（DOM 顺序 = 作品排序不变，行优先 + 自动补位） */
.works-grid{position:relative;column-count:4;column-gap:22px}
.w-card{
  display:inline-block;width:100%;margin:0 0 22px;vertical-align:top;
  break-inside:avoid;-webkit-column-break-inside:avoid;page-break-inside:avoid;
  border-radius:var(--r-lg);overflow:hidden;
  transition:transform .45s cubic-bezier(.2,.8,.25,1.2),box-shadow .45s,border-color .35s;
  animation:cardIn .6s cubic-bezier(.2,.7,.2,1) both;
  animation-delay:var(--stagger,0ms);
}
.works-grid.js-masonry{column-count:auto;column-gap:normal}
.works-grid.js-masonry .w-card{position:absolute;left:0;top:0;display:block;width:100%;margin:0}
@keyframes cardIn{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
.w-card:hover{transform:translateY(-7px);border-color:rgba(255,255,255,.3);box-shadow:inset 0 1px 0 rgba(255,255,255,.24),0 34px 70px -30px rgba(70,110,255,.55)}
.w-card.hide{display:none}
.w-cover{position:relative;overflow:hidden;line-height:0;background:linear-gradient(160deg,#1b2547,#101a36 55%,#152a52);border-bottom:1px solid rgba(255,255,255,.07)}
.w-cover::before{ /* 屏幕内玻璃高光 */
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,rgba(255,255,255,.09),transparent 22%),radial-gradient(120% 60% at 85% 0%,rgba(255,255,255,.07),transparent 50%);
}
.w-cover img{width:100%;height:auto;transition:transform .7s cubic-bezier(.2,.8,.2,1)}
.w-card:hover .w-cover img{transform:scale(1.05)}
.badge{
  position:absolute;top:16px;left:16px;z-index:3;display:inline-flex;align-items:center;gap:8px;
  padding:7px 15px;border-radius:999px;font-size:13px;font-weight:700;letter-spacing:.4px;
  color:#fff;text-shadow:0 1px 3px rgba(8,14,40,.35);
  background:linear-gradient(135deg,rgba(104,146,255,.95),rgba(56,200,240,.92));
  border:1px solid rgba(255,255,255,.35);
  box-shadow:0 10px 26px -10px rgba(76,140,255,.75),inset 0 1px 0 rgba(255,255,255,.5);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
}
.badge::before{content:"";width:7px;height:7px;border-radius:50%;background:#fff;box-shadow:0 0 10px 2px rgba(255,255,255,.85)}
.w-card .year-badge{
  position:absolute;top:16px;right:16px;z-index:3;display:inline-flex;align-items:center;
  font-family:var(--mono);font-size:13px;font-weight:600;letter-spacing:.5px;line-height:1;
  color:#e2ebff;padding:8px 13px;border-radius:999px;
  background:rgba(14,22,48,.72);border:1px solid rgba(255,255,255,.28);
  backdrop-filter:blur(10px) saturate(1.5);-webkit-backdrop-filter:blur(10px) saturate(1.5);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.22),0 10px 22px -12px rgba(30,60,150,.65);
}
/* 二维码浮层 */
.qr-layer{
  position:absolute;inset:0;z-index:4;display:grid;place-items:center;
  background:rgba(10,16,34,.4);backdrop-filter:blur(16px) saturate(1.4);
  -webkit-backdrop-filter:blur(16px) saturate(1.4);
  opacity:0;pointer-events:none;transition:opacity .35s ease;
}
.qr-box{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;padding:22px;border-radius:22px;
  border:1px solid rgba(255,255,255,.22);background:var(--glass-bg);box-shadow:var(--glass-sh);
  transform:translateY(14px) scale(.95);transition:transform .45s cubic-bezier(.2,.8,.3,1.15);margin:14px;
}
.qr-box img{width:140px;height:140px;margin-bottom:14px;border-radius:16px;background:#fff;padding:10px;box-shadow:0 14px 34px -8px rgba(0,0,0,.55)}
.qr-box b{font-size:14.5px;color:#fff}
.qr-box span{font-size:12.5px;color:#cfd9f5;line-height:1.5}
/* 操作提示胶囊：保证最小高度与对比度，长文案允许换行、不截断 */
.qr-hint{
  position:absolute;right:14px;bottom:12px;z-index:2;
  box-sizing:border-box;min-height:30px;padding:6px 14px;border-radius:999px;
  display:inline-flex;align-items:center;justify-content:center;text-align:center;
  font-size:12.5px;font-weight:500;line-height:1.45;letter-spacing:.02em;color:#e8eeff;
  background:rgba(10,16,34,.72);border:1px solid rgba(255,255,255,.2);
  backdrop-filter:blur(10px) saturate(1.4);-webkit-backdrop-filter:blur(10px) saturate(1.4);
  box-shadow:0 8px 20px -10px rgba(0,0,0,.65);
  max-width:calc(100% - 28px);
  opacity:0;transform:translateY(4px);transition:opacity .3s,transform .3s;
  pointer-events:none;
}
.w-card.can-qr:hover .qr-layer,.w-card.can-qr:focus-within .qr-layer{opacity:1;pointer-events:auto}
.w-card.can-qr:hover .qr-box,.w-card.can-qr:focus-within .qr-box{transform:none}
.w-card:hover .qr-hint,.w-card:focus-within .qr-hint{opacity:1;transform:none}
/* 移动端：点按卡片切换二维码浮层；无 hover 时提示常驻 */
.w-card.tap-qr.show-qr .qr-layer{opacity:1;pointer-events:auto}
.w-card.tap-qr.show-qr .qr-box{transform:none}
@media (hover:none){
  .w-card .qr-hint{opacity:1;transform:none}
}
/* 小屏：提示扩展为底部通栏胶囊，居中显示，避免截断与徽章重叠 */
@media (max-width:560px){
  .qr-hint{left:12px;right:12px;bottom:10px;min-height:32px;font-size:12px}
}
.w-body{padding:20px 22px 22px}
.w-meta{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:12px}
.w-tag{font-size:11.5px;padding:3px 11px;border-radius:7px;color:#c9e0ff;background:rgba(91,140,255,.15);border:1px solid rgba(120,160,255,.25)}
.w-tag.tag-year{color:#9be3b8;background:rgba(74,222,128,.1);border-color:rgba(74,222,128,.22)}
.w-title{font-size:19px;font-weight:700;letter-spacing:-.01em;margin-bottom:7px}
.w-desc{font-size:13.5px;color:var(--muted);line-height:1.7;margin-bottom:16px}
.w-foot{display:flex;justify-content:space-between;align-items:center;border-top:1px solid rgba(255,255,255,.09);padding-top:14px;font-size:13px;color:var(--faint)}
.w-act{display:inline-flex;align-items:center;gap:7px;color:#8ec5ff;transition:gap .3s,color .3s;font-weight:600;font-size:14px}
.w-act:hover{gap:11px;color:#cfe0ff}
.w-act.off{cursor:not-allowed;color:var(--faint);font-weight:400}
.w-card.clickable .w-cover{cursor:pointer}
/* 案例封面禁止长按保存/右键拖拽；二维码浮层保持默认可长按识别 */
.w-cover>img{-webkit-touch-callout:none;-webkit-user-select:none;user-select:none;pointer-events:none}
.qr-box img{pointer-events:auto;-webkit-touch-callout:default;-webkit-user-select:auto;user-select:auto}
.works-empty{text-align:center;color:var(--faint);padding:60px 0;border:1px dashed rgba(255,255,255,.16);border-radius:var(--r-lg)}

/* ---------- 联系 ---------- */
.contact-card{
  text-align:center;padding:100px 30px;border-radius:34px;overflow:hidden;
  display:flex;flex-direction:column;align-items:center;
}
.contact-card .sec-kicker{justify-content:center}
.contact-card .sec-kicker::after{content:"";width:26px;height:1px;background:linear-gradient(270deg,transparent,var(--accent))}
.contact-card .sec-title{font-size:clamp(32px,4.6vw,52px)}
.contact-text{color:var(--muted);margin:18px 0 34px}
.contact-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.contact-ps{color:var(--faint);font-size:14px;margin-top:26px;font-family:var(--mono)}
.contact-card .spot{background:radial-gradient(420px circle at var(--mx,50%) var(--my,-20%),rgba(255,255,255,.12),transparent 60%)}

/* ---------- 微信联系二维码 ---------- */
.contact-qr{position:relative;display:inline-flex}
.wx-qr-pop{
  position:absolute;left:50%;bottom:calc(100% + 14px);z-index:5;
  display:flex;flex-direction:column;align-items:center;gap:10px;padding:20px 20px 16px;border-radius:24px;
  border:1px solid var(--glass-bd);
  transform:translateX(-50%) translateY(10px) scale(.92);opacity:0;pointer-events:none;
  transition:opacity .3s ease,transform .4s cubic-bezier(.2,.8,.3,1.25);
  box-shadow:0 26px 60px -22px rgba(0,0,0,.75);
}
/* 二维码严格 1:1：aspect-ratio 锁定比例，object-fit:contain 防止拉伸变形 */
.wx-qr-pop img{width:172px;aspect-ratio:1/1;height:auto;object-fit:contain;border-radius:14px;background:#fff;padding:10px;box-shadow:0 10px 26px -10px rgba(0,0,0,.5)}
.wx-qr-pop b{font-size:14.5px;color:var(--txt);font-weight:600;white-space:nowrap}
/* 小屏：二维码适当缩放，避免超出屏幕宽度 */
@media (max-width:560px){
  .wx-qr-pop{padding:16px 16px 13px;border-radius:20px}
  .wx-qr-pop img{width:150px;padding:8px;border-radius:12px}
  .wx-qr-pop b{font-size:13px}
}
/* PC 端：鼠标悬停显示；移动端：点按切换 .show */
@media (hover:hover) and (pointer:fine){
  .contact-qr:hover .wx-qr-pop,.contact-qr:focus-within .wx-qr-pop{opacity:1;transform:translateX(-50%);pointer-events:auto}
}
.contact-qr.show .wx-qr-pop{opacity:1;transform:translateX(-50%);pointer-events:auto}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid rgba(255,255,255,.07);padding:40px 20px;text-align:center;color:var(--faint);font-size:13px;display:flex;flex-direction:column;gap:8px;background:rgba(255,255,255,.015)}
.footer-built{font-family:var(--mono);font-size:11px;opacity:.75;letter-spacing:.08em}

/* ---------- 返回顶部 ---------- */
.back-top{
  position:fixed;right:26px;bottom:26px;z-index:70;width:48px;height:48px;
  display:grid;place-items:center;border-radius:50%;cursor:pointer;color:var(--txt);
  border:1px solid var(--glass-bd-2);
  opacity:0;transform:translateY(18px) scale(.8);pointer-events:none;
  transition:opacity .35s ease,transform .45s cubic-bezier(.2,.8,.3,1.25),box-shadow .3s,border-color .3s;
  -webkit-tap-highlight-color:transparent;
}
.back-top svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .3s cubic-bezier(.2,.8,.3,1.4)}
.back-top.show{opacity:1;transform:none;pointer-events:auto;animation:backTopPop .5s cubic-bezier(.2,.8,.3,1.3)}
.back-top:hover{transform:translateY(-4px);border-color:rgba(255,255,255,.4);box-shadow:0 16px 36px -12px rgba(80,130,255,.55),inset 0 1px 0 rgba(255,255,255,.3)}
.back-top:hover svg{transform:translateY(-2px)}
.back-top:active{transform:translateY(-1px) scale(.94)}
@keyframes backTopPop{
  0%{opacity:0;transform:translateY(26px) scale(.6)}
  60%{opacity:1;transform:translateY(-4px) scale(1.05)}
  100%{opacity:1;transform:none}
}
@media (max-width:560px){
  .back-top{right:16px;bottom:16px;width:44px;height:44px}
}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:36px;transform:translateX(-50%) translateY(24px);z-index:99;
  padding:12px 22px;border-radius:999px;font-size:14px;color:var(--txt);pointer-events:none;
  opacity:0;transition:.4s cubic-bezier(.2,.8,.3,1.2);max-width:min(90vw,480px);text-align:center;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1024px){
  .topbar{padding:16px 24px}
  .skills-grid{grid-template-columns:repeat(2,1fr)}
  .section{padding:100px 20px}
}
@media (max-width:768px){
  .topbar{padding:14px 16px}
  .nav{
    position:absolute;top:calc(100% + 12px);right:0;min-width:230px;
    flex-direction:column;align-items:stretch;gap:2px;padding:10px;
    border-radius:26px;background:rgba(12,18,38,.92);
    border:1px solid var(--glass-bd);
    backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);
    box-shadow:0 30px 60px -20px rgba(0,0,0,.7);
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:.3s cubic-bezier(.2,.8,.3,1);
  }
  .nav.open{transform:none;opacity:1;pointer-events:auto}
  .nav a{padding:13px 16px;font-size:15.5px}
  .nav a.active::after{display:none}
  .nav a.active{background:rgba(255,255,255,.09)}
  .burger{display:flex}
  .hero{padding:120px 18px 90px}
}
@media (max-width:560px){
  .topbar{padding:12px 14px}
  .skills-grid{grid-template-columns:1fr}
  .hero-sub{font-size:19px;line-height:1.8;margin-bottom:36px}
  .contact-card{padding:72px 22px;border-radius:28px}
}

/* ---------- 作品瀑布流 · 响应式列数 ---------- */
@media (max-width:1180px){
  .works-grid{column-count:3;column-gap:20px}
  .w-card{margin-bottom:20px}
}
@media (max-width:920px){
  .works-grid{column-count:2;column-gap:18px}
  .w-card{margin-bottom:18px}
}
@media (max-width:560px){
  .works-grid{column-count:1}
  .w-card{margin-bottom:16px}
  .badge{top:12px;left:12px;padding:6px 12px;font-size:12px;gap:6px}
  .w-card .year-badge{top:12px;right:12px;padding:6px 11px;font-size:12px}
}

/* ---------- 移动端滚动性能：降低大面积模糊与持续动画的开销 ---------- */
@media (max-width:768px){
  :root{--blur:blur(12px) saturate(1.45)}      /* 全局玻璃模糊降档，减少滚动时重绘成本 */
  .orb{animation:none;filter:blur(64px);opacity:.55} /* 停掉背景光斑漂移动画 */
  .qr-layer{backdrop-filter:blur(10px) saturate(1.3);-webkit-backdrop-filter:blur(10px) saturate(1.3)}
  .topbar{will-change:transform}               /* 固定头部独立合成层，滚动不连坐重绘 */
}

/* 减弱动态偏好：保留可用性，去除一切多余运动 */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important}
  html{scroll-behavior:auto}
  .orb,.orb::after{animation:none!important}
  .reveal{opacity:1;transform:none}
}