/* Crystalize — blueprint / device-frame theme. Sharp corners, grid-paper ground,
   monospace technical labels, cyan accents, phone-frame cards, spec-sheet panels. */
:root {
  --ink: #0e2233;
  --ink-2: #16324a;
  --slate: #3c566d;
  --muted: #5f7688;
  --blue: #1f6feb;
  --blue-dk: #1450b0;
  --cyan: #0fb2c9;
  --lime: #46a758;
  --amber: #c98a12;
  --bg: #eef4f8;
  --card: #ffffff;
  --line: #cfdde8;
  --line-2: #b6c9d8;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--sans); color: var(--ink);
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(31,111,235,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31,111,235,.055) 1px, transparent 1px);
  background-size: 26px 26px;
  line-height: 1.65; font-size: 16px;
}
a { color: var(--blue-dk); text-decoration: none; }
a:hover { color: var(--cyan); }
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { background: var(--ink); color: #dceaf5; border-bottom: 3px solid var(--cyan); }
.header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding: 13px 0; }
.brand { display: flex; align-items: center; gap: 11px; color: #fff; }
.brand:hover { color: #fff; }
.brand-mark { color: var(--cyan); display: inline-flex; }
.brand-text { font-weight: 700; font-size: 22px; display: flex; flex-direction: column; line-height: 1; letter-spacing: -0.01em; }
.brand-sub { font-family: var(--mono); font-size: 11px; font-weight: 400; color: #7fa8c9; margin-top: 5px; }
.site-nav { display: flex; flex-wrap: wrap; gap: 0; }
.nav-link { font-family: var(--mono); font-size: 12px; color: #b3cee2; padding: 6px 10px; border: 1px solid transparent; }
.nav-link:hover { color: #fff; border-color: rgba(255,255,255,.22); }
.nav-link.is-active { color: #06202f; background: var(--cyan); border-color: var(--cyan); }

/* Hero */
.hero { padding: 54px 0 26px; }
.hero-kicker { font-family: var(--mono); font-size: 13px; color: var(--cyan); margin: 0 0 12px; }
.hero-title { font-size: 44px; line-height: 1.05; margin: 0 0 14px; color: var(--ink); letter-spacing: -0.025em; max-width: 20ch; }
.hero-lede { font-size: 18px; color: var(--slate); max-width: 62ch; margin: 0 0 16px; }
.hero-note { font-family: var(--mono); font-size: 13px; color: var(--ink-2); background: #fff; border: 1px solid var(--line-2); border-left: 4px solid var(--cyan); padding: 10px 14px; max-width: 62ch; margin: 0; }

/* Stages */
.stages { padding-bottom: 40px; }
.stage { margin: 34px 0; }
.stage-solo { padding-top: 6px; }
.stage-head { display: flex; gap: 14px; align-items: flex-start; border-bottom: 2px solid var(--line-2); padding-bottom: 12px; margin-bottom: 16px; }
.stage-num { font-family: var(--mono); font-size: 12px; font-weight: 700; color: #fff; background: var(--ink); padding: 5px 9px; letter-spacing: 0.08em; flex: none; }
.stage-name { margin: 0 0 3px; font-size: 22px; letter-spacing: -0.01em; }
.stage-name a { color: var(--ink); }
.stage-name a:hover { color: var(--blue-dk); }
.stage-blurb { margin: 0; font-size: 14px; color: var(--muted); max-width: 68ch; }

/* Device cards */
.devices { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.device { background: var(--card); border: 1px solid var(--line-2); border-radius: 14px; padding: 8px 8px 0; transition: box-shadow .15s, transform .15s; }
.device:hover { box-shadow: 0 14px 30px -20px rgba(14,34,51,.65); transform: translateY(-2px); }
.device-bar { display: block; height: 14px; position: relative; }
.notch { position: absolute; left: 50%; top: 1px; transform: translateX(-50%); width: 42px; height: 5px; border-radius: 999px; background: var(--line-2); }
.device-link { display: block; padding: 8px 12px 16px; }
.device-num { font-family: var(--mono); font-size: 12px; color: var(--cyan); }
.device-title { margin: 6px 0 7px; font-size: 18px; color: var(--ink); line-height: 1.22; }
.device-link:hover .device-title { color: var(--blue-dk); }
.device-desc { margin: 0 0 12px; font-size: 13.5px; color: var(--muted); }
.device-foot { display: flex; align-items: center; gap: 8px; }
.device-area { font-family: var(--mono); font-size: 11px; color: var(--muted); }

/* Level tags */
.ltag { font-family: var(--mono); font-size: 11px; padding: 3px 8px; border: 1px solid var(--line-2); }
.lt-beginner { color: #1c7a37; border-color: #b7e2c2; background: #ecf8ef; }
.lt-intermediate { color: #916007; border-color: #ecd9a6; background: #fcf4e0; }

/* Crumb + page title */
.crumb { font-family: var(--mono); font-size: 12px; color: var(--muted); padding-top: 24px; }
.crumb a { color: var(--slate); } .crumb a:hover { color: var(--blue-dk); }
.crumb .sep { margin: 0 7px; color: var(--line-2); }
.page-title { font-size: 34px; color: var(--ink); margin: 4px 0 8px; letter-spacing: -0.02em; }

/* Guide */
.guide { max-width: 790px; margin: 0 auto; padding-bottom: 56px; }
.guide-head { padding: 18px 0 8px; }
.guide-title { font-size: 36px; line-height: 1.13; color: var(--ink); margin: 4px 0 6px; letter-spacing: -0.02em; }
.guide-zh { font-family: var(--mono); font-size: 14px; color: var(--muted); margin: 0; }

/* Build spec panel */
.spec { background: var(--card); border: 1px solid var(--line-2); border-top: 4px solid var(--cyan); padding: 14px 18px; margin: 22px 0 10px; }
.spec-label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; color: var(--cyan); margin: 0 0 12px; }
.spec-row { display: grid; grid-template-columns: 130px 1fr; gap: 14px; padding: 8px 0; border-top: 1px dashed var(--line); }
.spec-row:first-of-type { border-top: 0; }
.spec-key { font-family: var(--mono); font-size: 12px; color: var(--slate); }
.spec-key.difficulty { color: var(--blue-dk); }
.spec-key.track { color: var(--cyan); }
.spec-key.avoid { color: #b4474f; }
.spec-val { font-size: 14.5px; color: var(--ink); }

/* Sections */
.sec { margin: 30px 0; }
.sec-heading { font-size: 21px; color: var(--ink); margin: 0 0 12px; }
.sec-num { font-family: var(--mono); font-size: 13px; color: #fff; background: var(--blue); padding: 2px 7px; margin-right: 10px; }
.sec-body p { margin: 0 0 14px; }
.sec-body p:last-child { margin-bottom: 0; }

/* Related */
.guide-related { margin: 36px 0 40px; border-top: 2px solid var(--line-2); padding-top: 20px; }
.rel-head { font-family: var(--mono); font-size: 13px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--slate); margin: 0 0 12px; }
.rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.rel-slot { display: flex; flex-direction: column; gap: 5px; background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--cyan); padding: 13px 15px; }
.rel-slot:hover { border-left-color: var(--blue); }
.rel-title { font-weight: 600; color: var(--ink); font-size: 15px; }
.rel-meta { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.rel-slot.is-drip { border-left-color: var(--line-2); opacity: 0.55; }

/* Legal */
.legal { max-width: 760px; margin: 0 auto; padding: 40px 0 56px; }
.legal h2 { font-size: 20px; color: var(--ink); margin: 24px 0 8px; }
.legal p { margin: 0 0 14px; }
.legal a { word-break: break-all; }

/* 404 */
.notfound { padding: 66px 0 80px; }
.notfound .page-title { font-size: 32px; }
.notfound p { color: var(--muted); max-width: 52ch; }
.cta { display: inline-block; font-family: var(--mono); font-size: 14px; padding: 11px 20px; background: var(--ink); color: #fff; }
.cta:hover { background: var(--blue-dk); color: #fff; }

/* Footer */
.site-footer { background: var(--ink-2); color: #b3cee2; margin-top: 24px; border-top: 3px solid var(--cyan); }
.site-footer .wrap { padding-top: 24px; padding-bottom: 24px; }
.foot-brand { font-weight: 700; color: #fff; margin: 0 0 8px; }
.foot-links { margin: 0 0 10px; font-size: 14px; font-family: var(--mono); }
.foot-links a { color: #8fb6d4; } .foot-links a:hover { color: #fff; }
.foot-links .dot { color: #5c7d96; }
.foot-note { margin: 0; font-size: 13px; color: #89a9c2; max-width: 68ch; }

@media (max-width: 640px) {
  .hero-title { font-size: 32px; }
  .guide-title, .page-title { font-size: 27px; }
  .header-inner { flex-direction: column; align-items: flex-start; }
  .spec-row { grid-template-columns: 1fr; gap: 2px; }
}