/* ============================================================
   Yue Yao OS — iPod / macOS skeuomorphic portfolio
   ============================================================ */

:root{
  --ink:#0E0E11;          /* desktop near-black */
  --ink-2:#17171B;
  --paper:#E3E0D7;        /* light panel */
  --paper-2:#D6D2C6;
  --fg:#EAE7DE;           /* light text on dark */
  --fg-dim:#9A968C;
  --line:rgba(233,229,218,.14);
  --accent:#E8503A;       /* vermilion */
  --accent-2:#5FA8D8;
  --gutter: clamp(20px, 5vw, 80px);
  --disp:"Space Grotesk", system-ui, sans-serif;
  --sans:"Manrope", system-ui, -apple-system, sans-serif;
  --mono:"Space Mono", ui-monospace, "SF Mono", monospace;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  margin:0; background:var(--ink); color:var(--fg);
  font-family:var(--sans); font-size:17px; line-height:1.55;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
img{ display:block; max-width:100%; }
button{ font:inherit; color:inherit; background:none; border:none; cursor:pointer; }
a{ color:inherit; text-decoration:none; }

.zh{ display:none; }
html[lang="zh"] .en{ display:none; }
html[lang="zh"] .zh{ display:inline; }
html[lang="zh"]{ --sans:"Manrope","Noto Sans SC","PingFang SC",sans-serif; }

/* ── Menu bar ────────────────────────────────────────────── */
.menubar{
  position:fixed; top:0; left:0; right:0; z-index:100;
  height:30px; display:flex; align-items:center; justify-content:space-between;
  padding:0 14px; font-family:var(--mono); font-size:12.5px; letter-spacing:.02em;
  background:rgba(12,12,15,.72); backdrop-filter:blur(16px) saturate(1.4);
  -webkit-backdrop-filter:blur(16px) saturate(1.4);
  border-bottom:1px solid var(--line); color:var(--fg);
}
.mb-left, .mb-right{ display:flex; align-items:center; gap:14px; }
.mb-logo{ color:var(--accent); }
.mb-name{ font-weight:700; }
.mb-item{ color:var(--fg); opacity:.85; transition:opacity .2s, color .2s; }
.mb-item:hover{ opacity:1; color:var(--accent); }
.mb-sig{ opacity:.5; }
.mb-clock{ opacity:.8; min-width:44px; text-align:right; }
.mb-lang{ font-family:var(--mono); font-size:11px; border:1px solid var(--line); border-radius:6px; padding:2px 8px; opacity:.85; }
.mb-lang:hover{ color:var(--accent); border-color:var(--accent); opacity:1; }

main{ padding-top:30px; }

/* scramble helper */
.scramble{ font-family:var(--mono); }

/* ── BOOT / HERO ─────────────────────────────────────────── */
.boot{
  min-height:calc(100vh - 30px); display:flex; flex-direction:column;
  justify-content:center; padding:0 var(--gutter);
  position:relative;
  background:
    radial-gradient(120% 90% at 80% -10%, rgba(232,80,58,.10), transparent 60%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.018) 0 1px, transparent 1px 3px);
}
.boot-inner{ max-width:1100px; }
.mono-label{ font-size:13px; letter-spacing:.14em; color:var(--accent); margin:0 0 28px; }
.boot-title{
  font-family:var(--mono); font-weight:700;
  font-size:clamp(38px,7.5vw,104px); line-height:1.02; letter-spacing:-.02em;
  margin:0; color:#F4F1E8;
}
.boot-sub{ font-size:clamp(15px,2vw,22px); letter-spacing:.04em; color:var(--fg-dim); margin:22px 0 0; }
.boot-blurb{ font-family:var(--sans); font-size:clamp(16px,1.7vw,19px); line-height:1.6; color:var(--fg-dim); max-width:60ch; margin:30px 0 0; }
.boot-blurb .en, .boot-blurb .zh{ color:var(--fg-dim); }
.boot-cue{
  position:absolute; bottom:34px; left:var(--gutter);
  font-family:var(--mono); font-size:12px; letter-spacing:.1em; text-transform:uppercase;
  color:var(--fg-dim); display:flex; align-items:center; gap:10px;
}
.boot-cue:hover{ color:var(--accent); }
.cue-arrow{ display:inline-block; animation:bob 1.8s ease-in-out infinite; }
@keyframes bob{ 0%,100%{ transform:translateY(0);} 50%{ transform:translateY(5px);} }

/* ── ABOUT window ────────────────────────────────────────── */
.desk{
  min-height:100vh; display:flex; align-items:center; justify-content:center;
  padding:80px var(--gutter);
  background:radial-gradient(90% 70% at 50% 30%, #1a1a20 0%, var(--ink) 70%);
}
.window{
  width:min(940px,100%); background:var(--paper); color:var(--ink);
  border-radius:12px; overflow:hidden;
  box-shadow:0 40px 120px rgba(0,0,0,.55), 0 2px 0 rgba(255,255,255,.5) inset;
  border:1px solid rgba(0,0,0,.25);
}
.win-bar{
  display:flex; align-items:center; gap:10px; height:38px; padding:0 14px;
  background:linear-gradient(#efece4,#ddd8cc); border-bottom:1px solid rgba(0,0,0,.14);
}
.lights{ display:flex; gap:8px; }
.lights i{ width:12px; height:12px; border-radius:50%; display:block; }
.lights i:nth-child(1){ background:#ff5f57; }
.lights i:nth-child(2){ background:#febc2e; }
.lights i:nth-child(3){ background:#28c840; }
.win-title{ font-family:var(--mono); font-size:12.5px; color:#4a463d; }
.win-spacer{ flex:1; }
.win-body{ padding:clamp(24px,4vw,48px); }
.win-lead{ font-family:var(--mono); font-size:clamp(18px,2.4vw,26px); line-height:1.3; color:var(--ink); margin:0 0 20px; }
.win-p .en, .win-p .zh{ font-size:16px; line-height:1.65; color:#3a362d; }

.skills{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; margin:36px 0 10px; }
.skill-h{ font-family:var(--mono); font-size:13px; letter-spacing:.05em; color:var(--accent); margin:0 0 12px; }
.skill-col ul{ list-style:none; margin:0; padding:0; display:flex; flex-wrap:wrap; gap:7px; }
.skill-col li{ font-family:var(--mono); font-size:12px; color:#3a362d; padding:5px 11px; background:var(--paper-2); border:1px solid rgba(0,0,0,.12); border-radius:6px; }

.recent-label{ font-family:var(--mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase; color:#7a7365; margin:34px 0 14px; }
.app-row{ display:flex; gap:clamp(14px,3vw,30px); flex-wrap:wrap; }
.app{ display:flex; flex-direction:column; align-items:center; gap:8px; width:86px; transition:transform .25s; }
.app img{ width:72px; height:72px; border-radius:18px; object-fit:cover; box-shadow:0 8px 20px rgba(0,0,0,.28), 0 0 0 1px rgba(0,0,0,.1); }
.app span{ font-family:var(--mono); font-size:10.5px; color:#4a463d; text-align:center; }
.app:hover{ transform:translateY(-6px); }

/* ── IPOD ────────────────────────────────────────────────── */
.pod-sec{ min-height:100vh; display:flex; flex-direction:column; align-items:center; justify-content:center; padding:80px var(--gutter); gap:30px; }
.pod-head{ text-align:center; }
.pod-head h2{ font-family:var(--mono); font-weight:700; font-size:clamp(24px,4vw,44px); letter-spacing:-.01em; margin:0; color:#F4F1E8; }
.pod-hint{ font-family:var(--mono); font-size:12px; color:var(--fg-dim); margin:12px 0 0; }

.ipod{
  width:min(340px,86vw); padding:22px 22px 30px; border-radius:34px;
  background:linear-gradient(#f6f6f4,#dcdcd8); position:relative;
  box-shadow:0 30px 80px rgba(0,0,0,.6), inset 0 1px 0 #fff, inset 0 -2px 6px rgba(0,0,0,.12);
  border:1px solid rgba(0,0,0,.18);
  user-select:none;
}
.ipod-screen{
  background:#0b0b0e; border-radius:8px; padding:12px; margin-bottom:26px;
  box-shadow:inset 0 2px 10px rgba(0,0,0,.7), 0 0 0 3px #c9c9c4;
  overflow:hidden;
}
.screen-status{ font-family:var(--mono); font-size:11px; color:#8f8f97; display:flex; justify-content:space-between; padding:0 2px 8px; border-bottom:1px solid rgba(255,255,255,.08); }
.scr-batt{ letter-spacing:-2px; color:#6fd36f; }

.coverflow{ position:relative; height:190px; margin:14px 0 10px; perspective:900px; }
.album{
  position:absolute; top:50%; left:50%; width:130px; height:130px;
  margin:-65px 0 0 -65px; transition:transform .45s cubic-bezier(.2,.7,.2,1), opacity .45s, filter .45s;
  transform-style:preserve-3d;
}
.album img{ width:100%; height:100%; object-fit:cover; border-radius:6px; box-shadow:0 10px 22px rgba(0,0,0,.5); }
.album.is-center{ z-index:5; }

.nowplaying{ text-align:center; padding:6px 4px 2px; }
.np-cat{ font-family:var(--mono); font-size:10px; letter-spacing:.06em; text-transform:uppercase; color:#8f8f97; margin:0; }
.np-title{ font-family:var(--disp); font-weight:600; font-size:16px; color:#f2efe6; margin:3px 0 1px; line-height:1.15; }
.np-cn{ font-family:var(--mono); font-size:11px; color:#a6a29a; margin:0; }
.np-links{ display:flex; gap:8px; justify-content:center; margin-top:9px; min-height:24px; }
.np-links a{ font-family:var(--mono); font-size:10.5px; letter-spacing:.03em; color:#0b0b0e; background:#e7e3d8; padding:4px 10px; border-radius:20px; transition:background .2s,color .2s; }
.np-links a.alt{ background:transparent; color:#cfcbc0; border:1px solid rgba(255,255,255,.25); }
.np-links a:hover{ background:var(--accent); color:#fff; }

/* click wheel */
.wheel{
  width:220px; height:220px; margin:0 auto; border-radius:50%; position:relative;
  background:radial-gradient(circle at 50% 35%, #f3f3f1, #d8d8d2);
  box-shadow:inset 0 2px 6px rgba(0,0,0,.14), inset 0 -3px 8px rgba(0,0,0,.10), 0 1px 0 #fff;
  touch-action:none;
}
.w-center{
  position:absolute; top:50%; left:50%; width:78px; height:78px; margin:-39px 0 0 -39px;
  border-radius:50%; background:radial-gradient(circle at 50% 38%, #fbfbfa, #dcdcd6);
  box-shadow:inset 0 1px 2px #fff, 0 2px 6px rgba(0,0,0,.2);
  font-family:var(--mono); font-size:11px; letter-spacing:.06em; color:#5a5750;
  transition:transform .1s;
}
.w-center:active{ transform:scale(.95); }
.w-label{ position:absolute; font-family:var(--mono); font-size:12px; letter-spacing:.08em; color:#8a877e; cursor:pointer; }
.w-menu{ top:12px; left:50%; transform:translateX(-50%); font-size:10.5px; }
.w-down{ bottom:14px; left:50%; transform:translateX(-50%); color:#b0ada4; }
.w-left{ left:16px; top:50%; transform:translateY(-50%); font-size:16px; }
.w-right{ right:16px; top:50%; transform:translateY(-50%); font-size:16px; }
.w-label:hover{ color:var(--accent); }

/* ── DOCK / CONTACT ──────────────────────────────────────── */
.dock-sec{ min-height:100vh; display:flex; flex-direction:column; align-items:center; justify-content:center; padding:80px var(--gutter) 60px; text-align:center; position:relative;
  background:radial-gradient(90% 70% at 50% 80%, #1a1a20 0%, var(--ink) 70%); }
.dock-title{ font-family:var(--mono); font-weight:700; font-size:clamp(48px,11vw,140px); line-height:.95; letter-spacing:-.03em; margin:0; color:#F4F1E8; }
.dock-sub{ font-family:var(--mono); font-size:13px; color:var(--fg-dim); margin:20px 0 60px; }

.dock{
  display:inline-flex; align-items:flex-end; gap:12px; padding:12px 18px;
  background:rgba(230,228,220,.1); border:1px solid rgba(255,255,255,.16);
  border-radius:22px; backdrop-filter:blur(18px); -webkit-backdrop-filter:blur(18px);
  box-shadow:0 20px 60px rgba(0,0,0,.5);
}
.dock-app{ position:relative; display:block; transition:transform .2s cubic-bezier(.2,.7,.2,1); }
.dock-app img, .di{
  width:58px; height:58px; border-radius:15px; object-fit:cover; display:flex;
  align-items:center; justify-content:center; box-shadow:0 8px 18px rgba(0,0,0,.35);
}
.di{ font-size:26px; background:linear-gradient(#3a3a42,#22222a); color:#e7e3d8; }
.di-mail{ background:linear-gradient(#4a8ff0,#2f6ad0); color:#fff; }
.di-gh{ background:linear-gradient(#2b2b31,#141418); }
.dock-app:hover{ transform:translateY(-14px) scale(1.12); }
.dock-div{ width:1px; align-self:stretch; margin:4px 4px; background:rgba(255,255,255,.2); }
.dock-tip{
  position:absolute; bottom:calc(100% + 10px); left:50%; transform:translateX(-50%) translateY(4px);
  font-family:var(--mono); font-size:11px; white-space:nowrap; color:#0b0b0e;
  background:#e7e3d8; padding:4px 9px; border-radius:6px; opacity:0; pointer-events:none;
  transition:opacity .2s, transform .2s;
}
.dock-app:hover .dock-tip{ opacity:1; transform:translateX(-50%) translateY(0); }

.colophon{ font-family:var(--mono); font-size:11px; color:var(--fg-dim); margin-top:56px; letter-spacing:.02em; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 720px){
  .mb-sig{ display:none; }
  .skills{ grid-template-columns:1fr; gap:16px; }
  .boot-cue{ left:var(--gutter); }
  .dock{ flex-wrap:wrap; justify-content:center; }
}
@media (max-width: 420px){
  .mb-item{ display:none; }
  .mb-name{ display:inline; }
}
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation:none !important; }
}