/* Shared styles for Bio-IT camp materials — class 5–6, three-track (BIO + EN + ZH)
   Brand continuity with camp-materials-bio-older,
   plus three explicit track ribbons (green/blue/red). */

:root{
  /* base brand */
  --leaf:#4FA864;
  --leaf-deep:#2E6B3D;
  --petri:#E96A8D;
  --teal:#2A9DB5;
  --sun:#F4B942;
  --lilac:#9B7EC9;
  --cream:#FFF6E2;
  --paper:#FFFBF0;
  --ink:#1F2D3D;
  --ink-soft:#475569;

  /* THREE TRACKS */
  --bio:#2E6B3D;     /* deep biology green */
  --bio-soft:#DEF0E1;
  --en:#1E5BAA;      /* mission blue */
  --en-soft:#D7E5F6;
  --zh:#C9342B;      /* lantern red */
  --zh-soft:#FBE0DE;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--paper);color:var(--ink);font-family:"Manrope", system-ui, sans-serif;font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}
body{
  background-image:
    radial-gradient(ellipse at top left, rgba(46,107,61,.10), transparent 50%),
    radial-gradient(ellipse at top right, rgba(30,91,170,.08), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(201,52,43,.07), transparent 55%);
  background-attachment:fixed;
  min-height:100vh;
}
.grain{position:fixed;inset:0;pointer-events:none;opacity:.04;mix-blend-mode:multiply;z-index:1;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");}
a{color:inherit}

/* Hub layout */
.hub{display:grid;grid-template-columns:280px 1fr;min-height:100vh;position:relative;z-index:2}
.side{position:sticky;top:0;align-self:start;height:100vh;overflow-y:auto;padding:28px 22px;border-right:2.5px solid var(--ink);background:var(--cream)}
.side h1{font-family:"Unbounded","Manrope",sans-serif;font-weight:600;font-size:24px;line-height:1;letter-spacing:-.02em;margin-bottom:4px}
.side h1 em{font-style:italic;color:var(--petri)}
.side .sub{font-size:11.5px;color:var(--ink-soft);margin-bottom:18px}

/* Track legend in sidebar */
.track-legend{display:flex;gap:6px;margin-bottom:20px;padding:8px;background:var(--paper);border:1.5px solid var(--ink);border-radius:10px}
.track-legend span{flex:1;text-align:center;font-size:10px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:5px 4px;border-radius:6px;color:#fff}
.track-legend .tl-bio{background:var(--bio)}
.track-legend .tl-en{background:var(--en)}
.track-legend .tl-zh{background:var(--zh)}

.side .nav-group{margin-bottom:18px}
.side .nav-h{font-family:"Caveat",cursive;font-size:20px;font-weight:700;color:var(--petri);margin-bottom:6px;transform:rotate(-2deg);display:inline-block}
.side a.nav{display:block;padding:6px 10px;border-radius:8px;font-size:12.5px;font-weight:500;color:var(--ink);text-decoration:none;border:1.5px solid transparent;margin-bottom:2px;transition:all .15s}
.side a.nav:hover{background:var(--paper);border-color:var(--ink)}
.side a.nav.active{background:var(--ink);color:var(--cream);border-color:var(--ink)}
.side a.nav .tag{display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:7px;vertical-align:middle}
.side a.nav .tag.bio{background:var(--bio)}
.side a.nav .tag.en{background:var(--en)}
.side a.nav .tag.zh{background:var(--zh)}

.main{padding:44px 52px 100px;max-width:1080px}

/* Page heading */
.page-eyebrow{display:inline-block;font-size:11px;letter-spacing:2px;text-transform:uppercase;background:var(--ink);color:var(--cream);padding:6px 14px;border-radius:99px;font-weight:700;margin-bottom:16px}
h1.page-title{font-family:"Unbounded","Manrope",sans-serif;font-weight:600;font-size:52px;line-height:.98;letter-spacing:-.02em;margin-bottom:14px}
h1.page-title em{font-style:italic;color:var(--petri)}
.page-tag{font-size:17px;color:var(--ink-soft);max-width:680px;margin-bottom:30px}

h2.sec{font-family:"Unbounded","Manrope",sans-serif;font-weight:500;font-size:30px;letter-spacing:-.01em;margin:40px 0 14px;border-bottom:2px solid var(--ink);padding-bottom:8px}
h2.sec em{font-style:italic;color:var(--teal)}
h3.sub{font-family:"Unbounded","Manrope",sans-serif;font-weight:600;font-size:22px;margin:22px 0 10px}

/* TRACK RIBBONS — used on every page */
.track-ribbon{display:inline-flex;align-items:center;gap:8px;font-size:11px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;padding:5px 12px;border-radius:99px;color:#fff;border:2px solid var(--ink);box-shadow:2px 2px 0 var(--ink);margin:0 6px 6px 0}
.track-ribbon.bio{background:var(--bio)}
.track-ribbon.en{background:var(--en)}
.track-ribbon.zh{background:var(--zh)}
.track-ribbon::before{content:"";width:7px;height:7px;background:var(--cream);border-radius:50%}

/* Cards */
.card{border:2.5px solid var(--ink);border-radius:18px;padding:22px;background:var(--paper);box-shadow:5px 5px 0 var(--ink);margin-bottom:16px}
.card.cream{background:var(--cream)}
.card.leaf{background:#DEF0E1}
.card.petri{background:#FCDCE5}
.card.teal{background:#CDE6EC}
.card.sun{background:#FFE9C7}
.card.lilac{background:#E6DDF2}
.card.bio{background:var(--bio-soft)}
.card.en{background:var(--en-soft)}
.card.zh{background:var(--zh-soft)}

/* Day card */
.day-card{position:relative;border:2.5px solid var(--ink);border-radius:16px;padding:18px 20px;background:var(--paper);box-shadow:4px 4px 0 var(--ink);margin-bottom:14px}
.day-card.bio{background:var(--bio-soft)}
.day-card.en{background:var(--en-soft)}
.day-card.zh{background:var(--zh-soft)}
.day-card.cream{background:var(--cream)}
.day-num{font-family:"Caveat",cursive;font-size:22px;font-weight:700;color:var(--petri);transform:rotate(-2deg);display:inline-block}
.day-title{font-family:"Unbounded","Manrope",sans-serif;font-size:22px;font-weight:600;line-height:1.05;margin:2px 0 8px}
.day-card h4{font-family:"Manrope",system-ui,sans-serif;font-weight:700;font-size:11.5px;letter-spacing:1.5px;text-transform:uppercase;color:var(--teal);margin:10px 0 4px}
.day-card ul{list-style:none;font-size:13.5px;line-height:1.55}
.day-card li{padding-left:14px;position:relative;margin-bottom:2px}
.day-card li::before{content:"→";position:absolute;left:0;color:var(--petri);font-weight:700}
.day-card .meta{font-size:11.5px;color:var(--ink-soft);margin-top:8px;font-style:italic}
.vocab-row{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:6px}
.vocab-chip{font-size:11px;font-weight:600;background:var(--ink);color:var(--cream);padding:3px 9px;border-radius:99px}
.vocab-chip.bio{background:var(--bio);color:#fff}
.vocab-chip.en{background:var(--en);color:#fff}
.vocab-chip.zh{background:var(--zh);color:#fff}

/* Three-track day grid: each day has 3 mini-blocks (BIO + EN + ZH) */
.tri-day{border:2.5px solid var(--ink);border-radius:18px;background:var(--paper);box-shadow:5px 5px 0 var(--ink);margin-bottom:18px;overflow:hidden}
.tri-day-h{background:var(--ink);color:var(--cream);padding:12px 20px;display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:10px}
.tri-day-h .dh-num{font-family:"Caveat",cursive;font-size:22px;color:var(--sun)}
.tri-day-h .dh-title{font-family:"Unbounded","Manrope",sans-serif;font-size:18px;font-weight:600;flex:1;min-width:200px}
.tri-day-h .dh-date{font-size:11px;letter-spacing:1.5px;text-transform:uppercase;opacity:.8;font-family:"JetBrains Mono",monospace}
.tri-body{display:grid;grid-template-columns:1.6fr 1fr 1fr}
.tri-cell{padding:14px 18px;border-right:1.5px dashed rgba(31,45,61,.18)}
.tri-cell:last-child{border-right:none}
.tri-cell.bio{background:linear-gradient(180deg,var(--bio-soft) 0%,var(--paper) 100%)}
.tri-cell.en{background:linear-gradient(180deg,var(--en-soft) 0%,var(--paper) 100%)}
.tri-cell.zh{background:linear-gradient(180deg,var(--zh-soft) 0%,var(--paper) 100%)}
.tri-cell .tc-tag{display:inline-block;font-size:10px;letter-spacing:1.5px;text-transform:uppercase;font-weight:700;padding:2px 8px;border-radius:99px;color:#fff;margin-bottom:6px}
.tri-cell.bio .tc-tag{background:var(--bio)}
.tri-cell.en .tc-tag{background:var(--en)}
.tri-cell.zh .tc-tag{background:var(--zh)}
.tri-cell .tc-min{font-family:"JetBrains Mono",monospace;font-size:10px;color:var(--ink-soft);margin-left:6px}
.tri-cell h5{font-family:"Unbounded","Manrope",sans-serif;font-size:15px;font-weight:600;line-height:1.15;margin-bottom:6px}
.tri-cell ul{list-style:none;font-size:12.5px;line-height:1.5}
.tri-cell li{padding-left:12px;position:relative;margin-bottom:2px}
.tri-cell li::before{content:"·";position:absolute;left:2px;font-weight:700}
.tri-cell .frase{font-family:"JetBrains Mono",monospace;font-size:11px;background:var(--paper);border:1.5px solid var(--ink);border-radius:6px;padding:3px 7px;display:inline-block;margin:3px 4px 3px 0;font-weight:600}
.tri-cell .pinyin{font-style:italic;color:var(--zh)}
.tri-cell .hanzi{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;font-size:18px;font-weight:600;color:var(--ink)}

@media (max-width:900px){.tri-body{grid-template-columns:1fr}}

/* Module separator */
.mod-head{display:flex;align-items:baseline;gap:14px;margin:28px 0 14px;padding-bottom:8px;border-bottom:2px solid var(--ink)}
.mod-num{font-family:"Caveat",cursive;font-size:34px;font-weight:700;color:var(--petri);line-height:.9}
.mod-title{font-family:"Unbounded","Manrope",sans-serif;font-size:22px;font-weight:600}
.mod-sub{font-size:12.5px;color:var(--ink-soft);margin-left:auto;font-style:italic}

/* Print button */
.print-btn{position:fixed;top:20px;right:20px;z-index:100;background:var(--ink);color:var(--cream);border:2.5px solid var(--ink);padding:10px 18px;border-radius:99px;font-family:"Manrope",system-ui,sans-serif;font-weight:700;font-size:13px;cursor:pointer;box-shadow:3px 3px 0 var(--petri);text-transform:uppercase;letter-spacing:1px}
.print-btn:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--petri)}

/* Vocabulary cards 3×3 */
.vocab-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.vcard{border:2.5px solid var(--ink);border-radius:14px;padding:16px;background:var(--paper);box-shadow:4px 4px 0 var(--ink);position:relative;min-height:170px;display:flex;flex-direction:column;justify-content:space-between}
.vcard.bio{background:var(--bio-soft)}
.vcard.en{background:var(--en-soft)}
.vcard.zh{background:var(--zh-soft)}
.vcard .vc-track{position:absolute;top:8px;right:10px;font-size:9px;letter-spacing:1.2px;text-transform:uppercase;font-weight:700;padding:2px 7px;border-radius:99px;color:#fff}
.vcard.bio .vc-track{background:var(--bio)}
.vcard.en .vc-track{background:var(--en)}
.vcard.zh .vc-track{background:var(--zh)}
.vcard .vc-pic{font-size:48px;text-align:center;line-height:1;margin:8px 0}
.vcard .vc-ru{font-family:"Unbounded","Manrope",sans-serif;font-size:18px;font-weight:600;line-height:1;margin-bottom:4px}
.vcard .vc-en{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--en);font-weight:600}
.vcard .vc-zh{display:flex;flex-direction:column;gap:2px;margin-top:4px}
.vcard .vc-zh .h{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;font-size:24px;font-weight:600;color:var(--ink);line-height:1}
.vcard .vc-zh .p{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--zh);font-weight:600;font-style:italic}

/* Copyright footer */
.copyright-footer{margin-top:64px;padding:18px 24px;border-top:2px solid var(--ink);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:11px;letter-spacing:1px;text-transform:uppercase;color:var(--ink-soft)}
.copyright-footer .cf-mark{font-weight:700;color:var(--ink)}
.copyright-footer .cf-mark em{font-style:normal;color:var(--petri)}

/* Print */
@page{size:A4;margin:14mm}
@media print{
  .grain,.side,.print-btn{display:none !important}
  body{background:#fff}
  .hub{display:block}
  .main{padding:0;max-width:none}
  .card,.day-card,.tri-day,.vcard{box-shadow:none;page-break-inside:avoid;break-inside:avoid}
  .page-break{page-break-after:always;break-after:page}
  h1.page-title,h2.sec{page-break-after:avoid;break-after:avoid}
  .copyright-footer{-webkit-print-color-adjust:exact;print-color-adjust:exact;color-adjust:exact;page-break-inside:avoid;break-inside:avoid}
  .tri-body{grid-template-columns:1.4fr 1fr 1fr !important}
  .vocab-grid{grid-template-columns:repeat(3,1fr)}
}

/* ============================================================
   ADDITIONS: Dark mode + Topbar (theme & language toggles)
   ============================================================ */

/* Dark mode color overrides */
html[data-theme="dark"]{
  --paper:#13191E;
  --cream:#1B232B;
  --ink:#E5EAF0;
  --ink-soft:#9CA8B5;
  --leaf:#5DBC72;
  --leaf-deep:#7DD498;
  --petri:#F38FA9;
  --teal:#5BB8CD;
  --sun:#F5C766;
  --lilac:#B69ADC;
  --bio:#5DBC72;
  --bio-soft:#1B2D22;
  --en:#5C9BE5;
  --en-soft:#142436;
  --zh:#E66258;
  --zh-soft:#2E1A18;
}
html[data-theme="dark"] body{
  background-image:
    radial-gradient(ellipse at top left, rgba(93,188,114,.10), transparent 50%),
    radial-gradient(ellipse at top right, rgba(92,155,229,.10), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(230,98,88,.07), transparent 55%);
}
html[data-theme="dark"] .grain{opacity:.06;mix-blend-mode:screen}
/* In dark mode some hard-coded white text on track ribbons / vocab chips needs no change — they're already #fff and tracks are still saturated. */
/* Cards that hard-coded pastel hex backgrounds look bad in dark mode; tone them down */
html[data-theme="dark"] .card.cream{background:#1B232B}
html[data-theme="dark"] .card.leaf{background:#1B2D22}
html[data-theme="dark"] .card.petri{background:#2C1A21}
html[data-theme="dark"] .card.teal{background:#0F2A30}
html[data-theme="dark"] .card.sun{background:#2D2515}
html[data-theme="dark"] .card.lilac{background:#221C2E}
/* Hero gradients on materials/index — soften */
html[data-theme="dark"] .hero-wrap,
html[data-theme="dark"] .hero{filter:saturate(.85) brightness(.95)}
/* Box shadows — keep but adjust offset for dark */
html[data-theme="dark"] .card,
html[data-theme="dark"] .day-card,
html[data-theme="dark"] .tri-day,
html[data-theme="dark"] .vcard,
html[data-theme="dark"] .pill,
html[data-theme="dark"] .hero-wrap,
html[data-theme="dark"] .hero{box-shadow:5px 5px 0 rgba(0,0,0,.6)}
html[data-theme="dark"] .print-btn{box-shadow:3px 3px 0 var(--petri)}

/* Smooth color transitions when toggling */
html,body,.side,.main,.card,.day-card,.tri-day,.vcard,.pill,.print-btn,.hero-wrap,.hero,
.track-ribbon,.vocab-chip,.page-eyebrow{transition:background-color .25s,color .25s,border-color .25s,box-shadow .25s}

/* ============================================================
   TOP BAR — injected by shared.js on every page
   ============================================================ */
.topbar{
  position:sticky;top:0;z-index:90;
  display:flex;align-items:center;gap:8px;
  padding:10px 18px;
  background:rgba(255,251,240,.92);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1.5px solid var(--ink);
}
html[data-theme="dark"] .topbar{background:rgba(19,25,30,.92)}
.topbar .tb-brand{
  font-family:"Unbounded",sans-serif;font-size:13px;font-weight:700;
  color:var(--ink);text-decoration:none;letter-spacing:-.01em;
  margin-right:4px;white-space:nowrap;
}
.topbar .tb-brand em{font-style:normal;color:var(--bio)}
.topbar .tb-spacer{flex:1}
.topbar .tb-links{display:flex;align-items:center;gap:4px}
.topbar a.tb-link{
  font-family:"Manrope",sans-serif;font-size:12px;font-weight:600;
  color:var(--ink);text-decoration:none;
  padding:6px 11px;border-radius:8px;border:1.5px solid transparent;
  transition:all .15s;white-space:nowrap;
}
.topbar a.tb-link:hover{border-color:var(--ink);background:var(--paper)}
.topbar .tb-controls{display:flex;align-items:center;gap:8px}
.topbar .tb-toggle{
  display:inline-flex;align-items:center;
  border:1.5px solid var(--ink);border-radius:99px;background:var(--paper);
  overflow:hidden;
  font-family:"Manrope",sans-serif;font-size:11px;font-weight:700;letter-spacing:.5px;
}
.topbar .tb-toggle button{
  background:none;border:none;cursor:pointer;
  padding:6px 11px;color:var(--ink-soft);
  font:inherit;letter-spacing:inherit;
  transition:all .15s;
}
.topbar .tb-toggle button.active{background:var(--ink);color:var(--cream)}
.topbar .tb-toggle button:hover:not(.active){color:var(--ink)}

/* Hamburger button — hidden on desktop */
.topbar .tb-burger{
  display:none;flex-direction:column;justify-content:center;align-items:center;gap:5px;
  width:38px;height:38px;border:1.5px solid var(--ink);border-radius:10px;
  background:var(--paper);cursor:pointer;padding:0;flex-shrink:0;
}
.topbar .tb-burger span{
  display:block;width:18px;height:2px;background:var(--ink);
  border-radius:2px;transition:transform .2s,opacity .2s;
}
.topbar[data-menu-open] .tb-burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.topbar[data-menu-open] .tb-burger span:nth-child(2){opacity:0}
.topbar[data-menu-open] .tb-burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Mobile drawer */
.tb-drawer{
  display:none;
  position:fixed;top:0;left:0;right:0;bottom:0;z-index:89;
  background:var(--paper);
  flex-direction:column;
  padding:70px 24px 32px;
  overflow-y:auto;
  border-bottom:2px solid var(--ink);
}
.tb-drawer.open{display:flex}
.tb-drawer a{
  font-family:"Unbounded",sans-serif;font-size:18px;font-weight:600;
  color:var(--ink);text-decoration:none;
  padding:16px 0;border-bottom:1.5px solid rgba(31,45,61,.12);
  display:block;
}
.tb-drawer a:last-of-type{border-bottom:none}
.tb-drawer .tb-drawer-controls{
  display:flex;gap:10px;margin-top:24px;flex-wrap:wrap;
}
.tb-drawer .tb-toggle{
  display:inline-flex;align-items:center;
  border:1.5px solid var(--ink);border-radius:99px;background:var(--cream);
  overflow:hidden;
  font-family:"Manrope",sans-serif;font-size:12px;font-weight:700;
}
.tb-drawer .tb-toggle button{
  background:none;border:none;cursor:pointer;
  padding:8px 16px;color:var(--ink-soft);font:inherit;
  transition:all .15s;
}
.tb-drawer .tb-toggle button.active{background:var(--ink);color:var(--cream)}

/* Coming-soon banner shown when EN is active on Russian-only pages */
.lang-banner{
  display:none;
  background:linear-gradient(90deg,var(--sun),var(--petri));
  color:var(--ink);font-weight:600;font-size:13px;
  padding:10px 18px;text-align:center;
  border-bottom:1.5px solid var(--ink);
}
html[data-lang="en"] .lang-banner.show-en{display:block}

/* ============================================================
   i18n: hide/show by language attribute
   ============================================================ */
html[data-lang="en"] [data-i18n="ru"]{display:none}
html[data-lang="ru"] [data-i18n="en"]{display:none}

/* ============================================================
   RESPONSIVE — shared layout rules
   ============================================================ */
/* Mobile sidebar toggle button (shown inside .main on small screens) */
.sidebar-toggle-btn{
  display:none;
  align-items:center;gap:8px;
  margin-bottom:20px;
  font-family:"Manrope",sans-serif;font-size:13px;font-weight:700;
  padding:9px 16px;border:1.5px solid var(--ink);border-radius:10px;
  background:var(--paper);color:var(--ink);cursor:pointer;
  box-shadow:3px 3px 0 var(--ink);
}

/* Mobile sidebar overlay */
.side.mobile-open{
  display:block !important;
  position:fixed;top:0;left:0;bottom:0;z-index:88;
  width:min(300px, 85vw);
  height:100%;border-right:2.5px solid var(--ink);
  box-shadow:8px 0 0 rgba(0,0,0,.15);
  overflow-y:auto;
}
.side-overlay{
  display:none;position:fixed;inset:0;z-index:87;
  background:rgba(0,0,0,.4);
}
.side-overlay.open{display:block}

@media (max-width:780px){
  /* Hub layout: sidebar collapses */
  .hub{grid-template-columns:1fr}
  .side{display:none}
  .main{padding:20px 16px 80px;max-width:100%}
  h1.page-title{font-size:36px}
  h2.sec{font-size:22px}
  .sidebar-toggle-btn{display:flex}
}

@media (max-width:640px){
  /* Topbar: hide text links, show burger */
  .topbar .tb-links{display:none}
  .topbar .tb-burger{display:flex}
  .topbar{padding:8px 14px;gap:8px}
  .topbar .tb-controls{gap:6px}
  .topbar .tb-toggle button{padding:5px 9px;font-size:10px}
}