/* ════════════════════════════════════════════════════════════
   Shared styles for project detail pages
   (design tokens mirrored from ../index.html so the two feel
   like one site)
   ════════════════════════════════════════════════════════════ */
:root{
  --bg:            #fbfbfd;
  --bg-elevated:   #ffffff;
  --bg-subtle:     #f4f4f8;
  --border:        #e8e8f0;
  --border-strong: #d6d6e4;

  --text:          #16161d;
  --text-muted:    #5a5a6e;
  --text-faint:    #8b8ba3;

  --indigo:  #5b5bd6;
  --violet:  #9b5de5;
  --rose:    #ef5da8;
  --teal:    #00b3ae;
  --amber:   #f2994a;
  --green:   #22a06b;

  --grad: linear-gradient(115deg, var(--indigo) 0%, var(--violet) 42%, var(--rose) 100%);

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --gutter:  clamp(20px, 5vw, 40px);
  --content: 880px;
  --radius:  16px;
  --radius-lg: 24px;

  --nav-h: 62px;
  --shadow-sm: 0 1px 2px rgba(22,22,29,.05), 0 4px 12px -6px rgba(22,22,29,.08);
  --shadow-md: 0 2px 6px rgba(22,22,29,.05), 0 18px 40px -22px rgba(22,22,29,.28);
  --shadow-lg: 0 30px 70px -34px rgba(60,40,140,.42);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth; -webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:clamp(15px, 0.45vw + 14px, 16.5px);
  line-height:1.72;
  letter-spacing:-0.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{display:block; max-width:100%}
a{color:inherit}
h1,h2,h3,h4{margin:0; font-weight:650; line-height:1.25; letter-spacing:-0.025em}
p{margin:0}
ul{margin:0; padding:0; list-style:none}

::selection{background:rgba(155,93,229,.18); color:var(--indigo)}
:focus-visible{outline:2px solid var(--indigo); outline-offset:3px; border-radius:6px}

.wrap{width:100%; max-width:var(--content); margin-inline:auto; padding-inline:var(--gutter)}

/* ── ambient background ─────────────────────────────────── */
.ambient{position:fixed; inset:0; z-index:-1; overflow:hidden; pointer-events:none}
.blob{position:absolute; border-radius:50%; filter:blur(70px); opacity:.4}
.blob--1{ width:44vmax; height:44vmax; top:-18vmax; left:-14vmax;
  background:radial-gradient(circle at 35% 35%, rgba(91,91,214,.4), transparent 68%); }
.blob--2{ width:38vmax; height:38vmax; top:4vmax; right:-16vmax;
  background:radial-gradient(circle at 60% 40%, rgba(239,93,168,.3), transparent 68%); }

/* ── nav ─────────────────────────────────────────────────── */
.nav{
  position:sticky; top:0; z-index:60; height:var(--nav-h);
  background:rgba(251,251,253,.78);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--border);
}
.nav__inner{
  height:100%; max-width:var(--content); margin-inline:auto; padding-inline:var(--gutter);
  display:flex; align-items:center; justify-content:space-between; gap:16px;
}
.brand{display:inline-flex; align-items:center; gap:9px; font-weight:700; font-size:15px; text-decoration:none; letter-spacing:-0.015em}
.brand__mark{
  width:26px; height:26px; border-radius:8px; flex:none;
  background:var(--grad); display:grid; place-items:center;
  color:#fff; font-size:12px; font-weight:700;
  box-shadow:0 4px 12px -4px rgba(91,91,214,.6);
}
.back{
  display:inline-flex; align-items:center; gap:6px;
  font-size:14px; font-weight:500; text-decoration:none; color:var(--text-muted);
  padding:7px 12px; border-radius:9px;
  transition:color .2s ease, background-color .2s ease;
}
.back:hover{color:var(--text); background:var(--bg-subtle)}
.back svg{width:15px; height:15px}

/* ── hero ────────────────────────────────────────────────── */
.hero{padding-block:clamp(40px, 7vw, 72px) clamp(28px, 5vw, 44px)}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:11.5px;
  letter-spacing:.1em; text-transform:uppercase;
  color:var(--text-faint); margin-bottom:16px;
}
.eyebrow::before{
  content:""; width:6px; height:6px; border-radius:50%;
  background:var(--hue, var(--indigo)); box-shadow:0 0 0 4px color-mix(in srgb, var(--hue, var(--indigo)) 16%, transparent);
}
.hero h1{font-size:clamp(28px, 4.6vw, 44px); font-weight:750; letter-spacing:-0.032em; margin-bottom:16px}
.hero__lede{color:var(--text-muted); max-width:62ch; font-size:clamp(15.5px, 1.2vw, 17.5px)}

.meta-row{display:flex; flex-wrap:wrap; gap:9px; margin-top:24px}
.meta-chip{
  display:inline-flex; align-items:center; gap:7px;
  padding:7px 13px; border-radius:10px;
  background:var(--bg-elevated); border:1px solid var(--border);
  font-size:13px; color:var(--text-muted); font-weight:500;
}
.meta-chip svg{width:14px; height:14px; color:var(--hue, var(--indigo))}

.hero__actions{display:flex; flex-wrap:wrap; gap:11px; margin-top:28px}
.btn{
  position:relative; overflow:hidden;
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:12px 22px; border-radius:12px;
  font-size:14.5px; font-weight:600; text-decoration:none;
  border:1px solid transparent;
  transition:transform .22s cubic-bezier(.2,.7,.3,1), box-shadow .28s ease, border-color .22s ease;
}
.btn svg{width:15px; height:15px; flex:none}
.btn--primary{color:#fff; background:var(--grad); box-shadow:var(--shadow-lg)}
.btn--primary:hover{transform:translateY(-2px); box-shadow:0 24px 44px -20px rgba(91,91,214,.6)}
.btn--ghost{background:rgba(255,255,255,.8); color:var(--text); border-color:var(--border); box-shadow:var(--shadow-sm)}
.btn--ghost:hover{transform:translateY(-2px); border-color:var(--border-strong); box-shadow:var(--shadow-md)}

/* ── cover illustration ─────────────────────────────────── */
.cover{
  margin-top:clamp(32px, 5vw, 48px);
  border-radius:var(--radius-lg);
  overflow:hidden;
  border:1px solid var(--border);
  box-shadow:var(--shadow-md);
  background:var(--bg-elevated);
}
.cover svg{width:100%; height:auto; display:block}

/* ── content ─────────────────────────────────────────────── */
.content{padding-block:clamp(40px, 6vw, 64px)}
.content h2{
  font-size:clamp(20px, 2.6vw, 26px); font-weight:700; letter-spacing:-0.026em;
  margin-top:clamp(40px, 6vw, 56px); margin-bottom:14px;
}
.content h2:first-child{margin-top:0}
.prose{color:var(--text-muted); max-width:68ch; font-size:clamp(15px, 1.1vw, 16.5px)}
.prose p + p{margin-top:16px}
.prose strong{color:var(--text); font-weight:600}

.figure{
  margin-top:22px; border-radius:var(--radius); overflow:hidden;
  border:1px solid var(--border); box-shadow:var(--shadow-sm);
  background:var(--bg-elevated);
}
.figure svg{width:100%; height:auto; display:block}
.figure figcaption{
  padding:12px 18px; font-size:13px; color:var(--text-faint);
  border-top:1px solid var(--border); font-family:var(--font-mono);
}

.gallery{display:grid; gap:16px; margin-top:22px; grid-template-columns:1fr}
@media (min-width:680px){ .gallery{grid-template-columns:1fr 1fr} }
.gallery .figure{margin-top:0}

.stat-grid{display:grid; gap:14px; margin-top:22px; grid-template-columns:repeat(2, 1fr)}
@media (min-width:560px){ .stat-grid{grid-template-columns:repeat(3, 1fr)} }
.stat{
  padding:18px; border-radius:var(--radius);
  background:var(--bg-elevated); border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
}
.stat__num{
  font-family:var(--font-mono); font-size:clamp(22px, 3vw, 28px); font-weight:700;
  color:var(--hue, var(--indigo)); margin-bottom:4px;
}
.stat__label{font-size:13px; color:var(--text-muted)}

.list{display:grid; gap:12px; margin-top:18px}
.list li{
  display:flex; gap:11px; align-items:flex-start;
  color:var(--text-muted); font-size:15px;
}
.list li svg{width:18px; height:18px; flex:none; margin-top:2px; color:var(--hue, var(--indigo))}
.list li strong{color:var(--text); font-weight:600}

.tags{display:flex; flex-wrap:wrap; gap:8px; margin-top:18px}
.tag{
  font-family:var(--font-mono); font-size:12.5px;
  padding:6px 11px; border-radius:8px;
  background:var(--bg-subtle); border:1px solid var(--border);
  color:var(--text-muted);
}

.callout{
  margin-top:22px; padding:20px 22px; border-radius:var(--radius);
  background:color-mix(in srgb, var(--hue, var(--indigo)) 7%, var(--bg-elevated));
  border:1px solid color-mix(in srgb, var(--hue, var(--indigo)) 22%, var(--border));
}
.callout p{color:var(--text-muted); font-size:14.5px}
.callout p + p{margin-top:8px}
.callout strong{color:var(--text)}

/* ── quote banner: bold, centered callout for a single line ─ */
.quote-banner{
  margin-top:clamp(22px, 4vw, 32px);
  padding-inline:clamp(20px, 4vw, 36px);
  text-align:center;
}
.quote-banner p{
  font-size:clamp(16px, 2vw, 19px); font-weight:700; letter-spacing:-0.015em;
  color:var(--text); line-height:1.5;
}

/* ── project nav (prev/next) ─────────────────────────────── */
.proj-nav{
  display:grid; gap:14px; grid-template-columns:1fr;
  padding-block:clamp(28px, 5vw, 40px) clamp(48px, 8vw, 72px);
  border-top:1px solid var(--border);
}
@media (min-width:600px){ .proj-nav{grid-template-columns:1fr 1fr} }
.proj-nav a{
  display:flex; flex-direction:column; gap:6px;
  padding:20px 22px; border-radius:var(--radius);
  background:var(--bg-elevated); border:1px solid var(--border);
  text-decoration:none;
  transition:transform .22s cubic-bezier(.2,.7,.3,1), box-shadow .28s ease, border-color .22s ease;
}
.proj-nav a:hover{transform:translateY(-2px); box-shadow:var(--shadow-md); border-color:var(--border-strong)}
.proj-nav .dir{font-family:var(--font-mono); font-size:11.5px; color:var(--text-faint); letter-spacing:.06em; text-transform:uppercase}
.proj-nav .title{font-size:15.5px; font-weight:650}
.proj-nav .next{text-align:right; align-items:flex-end}

footer{
  border-top:1px solid var(--border);
  padding-block:28px calc(28px + env(safe-area-inset-bottom));
  font-size:13px; color:var(--text-faint);
  display:flex; flex-wrap:wrap; gap:10px; justify-content:space-between; align-items:center;
}
footer a{color:var(--text-muted); text-decoration:none}
footer a:hover{color:var(--indigo)}

@media (max-width:640px){
  .actions .btn, .hero__actions .btn{flex:1 1 auto}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}