:root{
  --bg:#ffffff;
  --band:#f3f5f4;
  --surface:#ffffff;
  --fg:#14201b;
  --muted:#55655e;
  --line:#dfe5e2;
  --accent:#0d7a4b;
  --accent-ink:#ffffff;
  --accent-soft:#e1f3ea;
  --focus:#0d7a4b;

  --kin-bg:#fde8e6; --kin-fg:#a9261b;
  --mech-bg:#e3edfd; --mech-fg:#1d4aa8;
  --coll-bg:#e0f2fe; --coll-fg:#075985;
  --math-bg:#f3e8ff; --math-fg:#6b21a8;
  --elec-bg:#fcf0cf; --elec-fg:#7d5200;
  --therm-bg:#fbe3ef; --therm-fg:#9b2058;
  --opt-bg:#ece6fb; --opt-fg:#5530b0;

  --font-display:'Bricolage Grotesque','IBM Plex Sans Arabic',system-ui,sans-serif;
  --font-body:'IBM Plex Sans Arabic',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,Menlo,monospace;
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0e1512; --band:#141d19; --surface:#18221e;
    --fg:#e8f0ec; --muted:#9fb0a8; --line:#2a3832;
    --accent:#3fcf90; --accent-ink:#06150e;
    --accent-soft:#17352a; --focus:#3fcf90;
    --kin-bg:#3b1f1d; --kin-fg:#ff9f96;
    --mech-bg:#1c2b4a; --mech-fg:#9dbcff;
    --coll-bg:#123047; --coll-fg:#7dd3fc;
    --math-bg:#3b1d54; --math-fg:#d8b4fe;
    --elec-bg:#3a2d10; --elec-fg:#f2c868;
    --therm-bg:#3b1c2c; --therm-fg:#ff9cc7;
    --opt-bg:#2a2250; --opt-fg:#c0aeff;
    color-scheme:dark;
  }
}

:root[data-theme="dark"]{
  --bg:#0e1512; --band:#141d19; --surface:#18221e;
  --fg:#e8f0ec; --muted:#9fb0a8; --line:#2a3832;
  --accent:#3fcf90; --accent-ink:#06150e;
  --accent-soft:#17352a; --focus:#3fcf90;
  --kin-bg:#3b1f1d; --kin-fg:#ff9f96;
  --mech-bg:#1c2b4a; --mech-fg:#9dbcff;
  --coll-bg:#123047; --coll-fg:#7dd3fc;
  --math-bg:#3b1d54; --math-fg:#d8b4fe;
  --elec-bg:#3a2d10; --elec-fg:#f2c868;
  --therm-bg:#3b1c2c; --therm-fg:#ff9cc7;
  --opt-bg:#2a2250; --opt-fg:#c0aeff;
  color-scheme:dark;
}

:root[data-theme="light"]{
  --bg:#ffffff; --band:#f3f5f4; --surface:#ffffff;
  --fg:#14201b; --muted:#55655e; --line:#dfe5e2;
  --accent:#0d7a4b; --accent-ink:#ffffff;
  --accent-soft:#e1f3ea; --focus:#0d7a4b;
  --kin-bg:#fde8e6; --kin-fg:#a9261b;
  --mech-bg:#e3edfd; --mech-fg:#1d4aa8;
  --coll-bg:#e0f2fe; --coll-fg:#075985;
  --math-bg:#f3e8ff; --math-fg:#6b21a8;
  --elec-bg:#fcf0cf; --elec-fg:#7d5200;
  --therm-bg:#fbe3ef; --therm-fg:#9b2058;
  --opt-bg:#ece6fb; --opt-fg:#5530b0;
  color-scheme:light;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}

body.site{
  background:var(--bg);
  color:var(--fg);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  margin:0;
  overflow-x:hidden;
  min-height:100vh;
  display:flex;
  flex-direction:column;
}

main{flex:1}

.wrap{max-width:1120px;margin-inline:auto;padding-inline:20px}
section.block{padding-block:64px;scroll-margin-top:96px}
section.page-header{padding-block:48px 36px;border-bottom:1px solid var(--line);background:var(--band)}
section.band{background:var(--band)}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--accent);
  font-weight:500;
}

[dir="rtl"] .eyebrow{
  letter-spacing:0;
  font-family:var(--font-body);
  font-size:13px;
  font-weight:600;
}

h1.display,h2.h2,h3.h3{
  font-family:var(--font-display);
  text-wrap:balance;
  margin:0;
  letter-spacing:-.02em;
  line-height:1.15;
}

h1.display{font-size:clamp(2.1rem,5vw,3.6rem);font-weight:800}
h2.h2{font-size:clamp(1.6rem,3.2vw,2.3rem);font-weight:700}
h3.h3{font-size:1.15rem;font-weight:700;letter-spacing:-.01em;line-height:1.3}

[dir="rtl"] h1.display,
[dir="rtl"] h2.h2,
[dir="rtl"] h3.h3{
  letter-spacing:0;
  line-height:1.35;
}

p.lead{color:var(--muted);font-size:1.075rem;max-width:65ch;margin:0}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible{
  outline:2px solid var(--focus);
  outline-offset:3px;
  border-radius:6px;
}

/* Header & Navigation */
.nav{
  position:sticky;
  top:0;
  top:env(safe-area-inset-top,0px);
  z-index:40;
  background:color-mix(in srgb,var(--bg) 92%,transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.nav-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  flex-wrap:wrap;
  padding-block:12px;
}

.logo{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.35rem;
  letter-spacing:-.02em;
  color:var(--fg);
  text-decoration:none;
  direction:ltr;
}

.logo svg{color:var(--accent)}

.links{
  display:flex;
  gap:4px;
  order:3;
  width:100%;
  overflow-x:auto;
  scrollbar-width:none;
}

.links::-webkit-scrollbar{display:none}

@media (min-width:760px){
  .links{order:0;width:auto;overflow:visible}
}

.links a{
  padding:8px 14px;
  border-radius:999px;
  color:var(--muted);
  text-decoration:none;
  font-weight:500;
  font-size:.95rem;
  white-space:nowrap;
  transition:background .15s,color .15s;
}

.links a:hover{color:var(--fg);background:var(--band)}
.links a.active{color:var(--accent);background:var(--accent-soft);font-weight:600}

.nav-controls{display:flex;align-items:center;gap:8px}

.theme-btn,.lang{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--surface);
  cursor:pointer;
  color:var(--muted);
  transition:background .15s,color .15s,border-color .15s;
}

.theme-btn{padding:6px 12px;font-size:13px;gap:6px;font-family:var(--font-mono)}
.theme-btn:hover,.lang:hover{border-color:var(--accent);color:var(--fg)}
.lang{padding:3px;font-family:var(--font-mono);font-size:13px}
.lang span{padding:5px 12px;border-radius:999px;line-height:1.2}
.lang span.on{background:var(--accent);color:var(--accent-ink);font-weight:500}

/* Simulated Browser Address Bar (Canvas Preview Only) */
.sim-browser-bar{
  background:var(--band);
  border-bottom:1px solid var(--line);
  padding:6px 16px;
  font-family:var(--font-mono);
  font-size:12px;
  direction:ltr;
}

.sim-browser-inner{
  max-width:1120px;
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:10px;
}

.sim-dots{
  display:inline-flex;
  gap:5px;
  align-items:center;
}

.sim-dots i{
  width:9px;
  height:9px;
  border-radius:50%;
  display:inline-block;
  background:var(--line);
}

.sim-dots i:nth-child(1){background:#ef4444}
.sim-dots i:nth-child(2){background:#f59e0b}
.sim-dots i:nth-child(3){background:#10b981}

.sim-url-form{
  flex:1;
  display:flex;
  align-items:center;
  gap:6px;
}

.sim-url-input{
  flex:1;
  background:var(--surface);
  color:var(--fg);
  border:1px solid var(--line);
  border-radius:7px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:12.5px;
  direction:ltr;
}

.sim-url-btn{
  background:var(--surface);
  color:var(--fg);
  border:1px solid var(--line);
  border-radius:7px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:12px;
  cursor:pointer;
  font-weight:600;
}

.sim-url-btn:hover{
  border-color:var(--accent);
  color:var(--accent);
}

/* Hero */
.hero{padding-block:56px 72px}

.hero-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:44px;
  align-items:center;
}

@media (min-width:900px){
  .hero-grid{grid-template-columns:1.08fr .92fr}
}

.hero-grid>*{min-width:0}

.hero-actions{
  margin-top:32px;
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}

/* Stats strip */
.stats-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:16px;
  margin-top:40px;
}

.stat-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:14px;
  padding:18px 20px;
}

.stat-value{
  font-family:var(--font-display);
  font-size:1.75rem;
  font-weight:800;
  color:var(--accent);
  line-height:1.1;
}

.stat-label{
  color:var(--muted);
  font-size:.9rem;
  margin-top:4px;
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border:1px solid transparent;
  border-radius:10px;
  padding:12px 20px;
  font-family:var(--font-body);
  font-weight:600;
  font-size:.95rem;
  cursor:pointer;
  text-decoration:none;
  line-height:1.5;
  transition:transform .15s,background .15s,border-color .15s,color .15s;
}

.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--fg)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-danger{background:var(--kin-bg);border-color:transparent;color:var(--kin-fg)}
.btn-danger:hover{border-color:var(--kin-fg)}
.btn-sm{padding:7px 13px;font-size:.86rem;border-radius:8px}
[dir="rtl"] .arrow{transform:scaleX(-1)}

.btn.is-unavailable{
  opacity:.48;
  filter:saturate(.25);
  cursor:not-allowed;
}
.btn.is-unavailable:hover{
  transform:none;
  border-color:var(--line);
  color:var(--muted);
}

/* Physics Sketch */
.sketch{
  border:1px solid var(--line);
  border-radius:18px;
  background:var(--surface);
  padding:18px 18px 12px;
}

.sketch svg{width:100%;height:auto;display:block}

.sketch .cap{
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--muted);
  display:flex;
  justify-content:space-around;
  gap:12px;
  flex-wrap:wrap;
  direction:ltr;
  padding-top:8px;
}

/* About & Pillars */
.about-grid{
  display:grid;
  gap:40px;
  grid-template-columns:1fr;
  margin-top:24px;
}

@media (min-width:860px){
  .about-grid{grid-template-columns:1.05fr .95fr}
}

.about-grid>*{min-width:0}

.pillars-cards{
  display:grid;
  gap:20px;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  margin-top:28px;
}

.pillar-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:16px;
  padding:24px;
  display:flex;
  flex-direction:column;
  gap:12px;
}

.pillars{display:grid;gap:18px;margin-top:28px}
.pillar{display:flex;gap:16px}
.pillar b,.pillar-card b{font-family:var(--font-display);display:block;font-size:1.08rem;line-height:1.3}
.pillar span,.pillar-card span{color:var(--muted);font-size:.95rem}

.pillar i,.pillar-card i{
  flex:none;
  width:38px;
  height:38px;
  border-radius:10px;
  background:var(--accent-soft);
  color:var(--accent);
  display:grid;
  place-items:center;
  font-style:normal;
  font-family:var(--font-mono);
  font-weight:600;
  font-size:14px;
}

/* Team */
.team{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  padding:28px;
}

.team p{margin:12px 0 0;color:var(--muted)}

.team-members{
  display:grid;
  gap:12px;
  margin-top:20px;
  padding-top:16px;
  border-top:1px solid var(--line);
}

.member-item{
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:.92rem;
  gap:12px;
  padding-block:4px;
}

.member-name{font-weight:600;color:var(--fg)}

.member-role{
  font-family:var(--font-mono);
  font-size:.8rem;
  color:var(--accent);
  background:var(--accent-soft);
  padding:3px 10px;
  border-radius:6px;
  white-space:nowrap;
}

[dir="rtl"] .member-role{
  font-family:var(--font-body);
  font-weight:500;
}

.vision{
  margin-top:20px;
  padding-top:20px;
  border-top:1px solid var(--line);
  color:var(--fg);
  font-weight:500;
}

/* Files Filter Toolbar */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  align-items:center;
  justify-content:space-between;
  margin-top:24px;
  padding:16px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:14px;
}

.filter-chips{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}

.filter-chip{
  border:1px solid var(--line);
  background:var(--bg);
  color:var(--muted);
  border-radius:999px;
  padding:6px 14px;
  font:inherit;
  font-size:.88rem;
  font-weight:600;
  cursor:pointer;
  transition:all .15s;
}

.filter-chip:hover{
  border-color:var(--accent);
  color:var(--fg);
}

.filter-chip.active{
  background:var(--accent);
  border-color:var(--accent);
  color:var(--accent-ink);
}

.filter-inputs{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
  flex:1;
  justify-content:flex-end;
  min-width:240px;
}

.search-input,.level-select{
  background:var(--bg);
  color:var(--fg);
  border:1px solid var(--line);
  border-radius:10px;
  padding:8px 12px;
  font:inherit;
  font-size:.9rem;
}

.search-input{min-width:210px;flex:1;max-width:320px}
.search-input:focus,.level-select:focus{border-color:var(--accent)}

.count{color:var(--muted);font-size:.92rem;margin-block:20px 24px;font-variant-numeric:tabular-nums;font-weight:500}

/* Translation notice */
.translation-notice{
  display:flex;
  align-items:flex-start;
  gap:12px;
  margin-top:24px;
  padding:14px 18px;
  background:var(--accent-soft);
  border:1px solid var(--line);
  border-inline-start:4px solid var(--accent);
  border-radius:12px;
  color:var(--fg);
}

.translation-notice .notice-icon{flex:none;font-size:1.1rem;line-height:1.7}
.translation-notice p{margin:0;font-size:.95rem;line-height:1.7}

/* Problem Cards Grid */
.topic-group{margin-bottom:44px}

.topic-title{
  font-size:1.4rem;
  margin-bottom:18px;
  padding-bottom:10px;
  border-bottom:2px solid var(--line);
  color:var(--accent);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
}

.topic-count-badge{
  font-family:var(--font-mono);
  font-size:.82rem;
  color:var(--muted);
  background:var(--band);
  padding:2px 10px;
  border-radius:999px;
  font-weight:500;
}

.grid{
  display:grid;
  gap:20px;
  grid-template-columns:repeat(auto-fill,minmax(min(100%,330px),1fr));
}

.card{
  display:flex;
  flex-direction:column;
  gap:14px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:16px;
  padding:22px;
  min-width:0;
  transition:border-color .15s,transform .15s;
}

.card:hover{border-color:var(--accent);transform:translateY(-2px)}
.card p{margin:0;color:var(--muted);font-size:.95rem;flex:1}
.tags{display:flex;gap:8px;flex-wrap:wrap;align-items:center}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  border-radius:6px;
  padding:3px 10px;
  font-size:.78rem;
  font-weight:600;
  line-height:1.5;
}

.tag[data-topic="kin"]{background:var(--kin-bg);color:var(--kin-fg)}
.tag[data-topic="mech"]{background:var(--mech-bg);color:var(--mech-fg)}
.tag[data-topic="math"]{background:var(--math-bg);color:var(--math-fg)}
.tag[data-topic="elec"]{background:var(--elec-bg);color:var(--elec-fg)}
.tag[data-topic="therm"]{background:var(--therm-bg);color:var(--therm-fg)}
.tag[data-topic="opt"]{background:var(--opt-bg);color:var(--opt-fg)}
.tag[data-topic]{background:var(--accent-soft);color:var(--accent)}
.tag[data-topic="kin"]{background:var(--kin-bg);color:var(--kin-fg)}
.tag[data-topic="mech"]{background:var(--mech-bg);color:var(--mech-fg)}
.tag[data-topic="math"]{background:var(--math-bg);color:var(--math-fg)}
.tag[data-topic="elec"]{background:var(--elec-bg);color:var(--elec-fg)}
.tag[data-topic="therm"]{background:var(--therm-bg);color:var(--therm-fg)}
.tag[data-topic="opt"]{background:var(--opt-bg);color:var(--opt-fg)}
.tag[data-topic="coll"]{background:var(--coll-bg);color:var(--coll-fg)}

.tag.lvl{background:transparent;border:1px solid var(--line);color:var(--muted)}
.tag.lvl[data-lvl="3"]{border-color:var(--accent);color:var(--accent)}
.pips{display:inline-flex;gap:3px;direction:ltr}
.pips b{width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.25}
.pips b.on{opacity:1}

.card-actions-group{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-top:auto;
  padding-top:12px;
  border-top:1px solid var(--line);
}

.action-row{
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
}

.download-count{
  display:inline-flex;
  align-items:center;
  gap:4px;
  margin-inline-start:auto;
  font:500 12px/1 var(--font-mono);
  color:var(--muted);
  background:var(--band);
  border:1px solid transparent;
  padding:6px 10px;
  border-radius:8px;
  transition:background .25s,color .25s,border-color .25s,transform .2s;
}

.download-count.is-bumped{
  background:var(--accent-soft);
  color:var(--accent);
  border-color:var(--accent);
  transform:scale(1.06);
}

.empty{padding:48px 16px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:16px}

/* Section Header Row with CTA */
.section-head-row{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  margin-bottom:28px;
}

/* =========================================================
   DEDICATED IN-SITE PREVIEW PAGE (preview.html)
   ========================================================= */
.preview-section{
  padding-block:28px 56px;
}

.preview-topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
  margin-bottom:20px;
}

.preview-nav-Cluster{
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
}

.preview-select{
  background:var(--surface);
  color:var(--fg);
  border:1px solid var(--line);
  border-radius:10px;
  padding:7px 12px;
  font:inherit;
  font-size:.9rem;
  font-weight:600;
  max-width:280px;
}

.preview-shell{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  overflow:hidden;
  box-shadow:0 12px 36px rgba(0,0,0,.06);
}

.preview-shell.is-focus-mode{
  position:fixed;
  inset:12px;
  z-index:90;
  display:flex;
  flex-direction:column;
  box-shadow:0 24px 80px rgba(0,0,0,.45);
}

.preview-meta-header{
  padding:20px 24px;
  border-bottom:1px solid var(--line);
  background:var(--surface);
  display:flex;
  flex-direction:column;
  gap:16px;
}

.preview-shell.is-focus-mode .preview-meta-header{
  padding:12px 20px;
}

.preview-shell.is-focus-mode .preview-desc-text{
  display:none;
}

.preview-title-row{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
}

.preview-title-block{
  display:flex;
  flex-direction:column;
  gap:8px;
  max-width:680px;
}

.preview-desc-text{
  margin:0;
  color:var(--muted);
  font-size:.95rem;
}

.preview-toolbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
  padding-top:14px;
  border-top:1px solid var(--line);
}

.preview-doc-tabs{
  display:inline-flex;
  background:var(--band);
  padding:4px;
  border-radius:11px;
  border:1px solid var(--line);
  gap:4px;
}

.preview-doc-tab{
  border:0;
  background:transparent;
  color:var(--muted);
  padding:7px 14px;
  border-radius:8px;
  font:inherit;
  font-size:.88rem;
  font-weight:600;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:6px;
  transition:all .15s;
}

.preview-doc-tab:hover{
  color:var(--fg);
}

.preview-doc-tab.active{
  background:var(--accent);
  color:var(--accent-ink);
  box-shadow:0 2px 8px rgba(0,0,0,.12);
}

.preview-doc-tab.is-disabled-tab{
  opacity:.55;
}

.preview-actions-right{
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
}

.preview-close{
  border:1px solid var(--line);
  background:var(--band);
  width:32px;
  height:32px;
  border-radius:8px;
  font-size:20px;
  line-height:1;
  cursor:pointer;
  color:var(--fg);
  display:grid;
  place-items:center;
}

.preview-close:hover{border-color:var(--accent);color:var(--accent)}

.preview-body{
  background:var(--band);
  height:min(76vh,780px);
  position:relative;
  display:flex;
  flex-direction:column;
}

.preview-shell.is-focus-mode .preview-body{
  flex:1;
  height:auto;
}

.preview-body iframe{
  width:100%;
  height:100%;
  border:0;
  display:block;
  flex:1;
}

/* Interactive Reader Controls inside Canvas Preview */
.canvas-reader-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:10px 18px;
  background:color-mix(in srgb,var(--surface) 88%,var(--band));
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.84rem;
  color:var(--muted);
}

.canvas-reader-controls{
  display:flex;
  align-items:center;
  gap:8px;
}

.reader-icon-btn{
  border:1px solid var(--line);
  background:var(--surface);
  color:var(--fg);
  border-radius:7px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:.82rem;
  font-weight:600;
  cursor:pointer;
}

.reader-icon-btn:hover{
  border-color:var(--accent);
  color:var(--accent);
}

.canvas-pages-scroller{
  flex:1;
  overflow:auto;
  padding:24px 16px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:20px;
}

.canvas-page-sheet{
  background:#ffffff;
  border:1px solid var(--line);
  border-radius:10px;
  box-shadow:0 10px 30px rgba(0,0,0,.14);
  max-width:100%;
  overflow:hidden;
  transition:width .2s ease;
}

.canvas-page-sheet img{
  width:100%;
  height:auto;
  display:block;
}

/* =========================================================
   HIDDEN ADMIN PAGE (Admin.html / admin.html)
   ========================================================= */
.admin-gate-wrap{
  max-width:460px;
  margin:48px auto;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  padding:32px 28px;
  box-shadow:0 12px 36px rgba(0,0,0,.06);
  text-align:center;
}

.admin-lock-badge{
  width:54px;
  height:54px;
  border-radius:14px;
  background:var(--accent-soft);
  color:var(--accent);
  display:grid;
  place-items:center;
  font-size:1.5rem;
  margin:0 auto 16px;
}

.admin-pass-form{
  display:flex;
  flex-direction:column;
  gap:14px;
  margin-top:22px;
}

.admin-input,
.admin-select,
.admin-textarea{
  width:100%;
  background:var(--bg);
  color:var(--fg);
  border:1px solid var(--line);
  border-radius:10px;
  padding:10px 14px;
  font:inherit;
  font-size:.94rem;
}

.admin-input:focus,
.admin-select:focus,
.admin-textarea:focus{
  border-color:var(--accent);
}

.admin-pass-input{
  text-align:center;
  font-family:var(--font-mono);
  font-size:1.15rem;
  letter-spacing:.2em;
  direction:ltr;
}

.admin-error-msg{
  color:var(--kin-fg);
  background:var(--kin-bg);
  border-radius:8px;
  padding:8px 12px;
  font-size:.88rem;
  font-weight:600;
}

.admin-top-actions{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
  padding:16px 20px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:16px;
  margin-bottom:28px;
}

.admin-panel-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:22px;
  max-width:860px;
  margin-inline:auto;
}

.admin-form-drawer{
  border:2px solid var(--accent);
  box-shadow:0 14px 40px rgba(0,0,0,.08);
}

.admin-drawer-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}

.admin-new-topic-box{
  grid-column:1 / -1;
  background:var(--accent-soft);
  border:1px solid var(--accent);
  border-radius:12px;
  padding:14px;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:12px;
}

.admin-db-tools{
  max-width:860px;
  margin:20px auto 0;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:14px;
  padding:12px 18px;
}

.admin-db-tools summary{
  cursor:pointer;
  font-weight:600;
  font-size:.9rem;
  color:var(--muted);
  user-select:none;
}

.admin-db-tools-body{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  align-items:center;
  margin-top:12px;
  padding-top:12px;
  border-top:1px solid var(--line);
}

.admin-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  padding:24px;
}

.admin-form-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
  margin-top:18px;
}

.admin-field{
  display:flex;
  flex-direction:column;
  gap:6px;
}

.admin-field.full{
  grid-column:1 / -1;
}

.admin-field label{
  font-size:.88rem;
  font-weight:600;
  color:var(--fg);
}

.admin-hint{
  font-family:var(--font-mono);
  font-size:.78rem;
  color:var(--muted);
  direction:ltr;
  text-align:left;
  background:var(--band);
  padding:8px 10px;
  border-radius:8px;
  border:1px dashed var(--line);
}

.admin-list{
  display:grid;
  gap:12px;
  margin-top:18px;
}

.admin-item{
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:14px;
  padding:16px;
  display:flex;
  flex-direction:column;
  gap:12px;
}

.admin-item-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}

.admin-item-title{
  font-weight:700;
  font-size:1rem;
  color:var(--fg);
}

.admin-item-stem{
  font-family:var(--font-mono);
  font-size:.8rem;
  color:var(--muted);
  direction:ltr;
}

.admin-sol-toggles{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  flex-wrap:wrap;
  padding-top:10px;
  border-top:1px solid var(--line);
}

.sol-chip-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  border:1px solid var(--line);
  background:var(--surface);
  color:var(--muted);
  padding:5px 11px;
  border-radius:8px;
  font-size:.82rem;
  font-weight:600;
  cursor:pointer;
  transition:all .15s;
}

.sol-chip-btn.is-on{
  background:var(--accent-soft);
  border-color:var(--accent);
  color:var(--accent);
}

/* FAQ */
.faq-list{display:grid;gap:14px;margin-top:28px}

.faq-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:14px;
  overflow:hidden;
  transition:border-color .15s;
}

.faq-item:hover{border-color:var(--accent)}

.faq-question{
  width:100%;
  text-align:inherit;
  padding:18px 22px;
  background:none;
  border:none;
  font:inherit;
  font-weight:600;
  font-size:1.03rem;
  color:var(--fg);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  cursor:pointer;
}

.faq-icon{transition:transform .2s ease;font-size:1.25rem;color:var(--accent);line-height:1}
.faq-item[open] .faq-icon{transform:rotate(45deg)}
.faq-answer{padding:0 22px 18px;color:var(--muted);font-size:.96rem;line-height:1.65}

/* Contact Cards */
.contact-cards{
  display:grid;
  gap:20px;
  margin-top:28px;
}

.feedback-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  padding:24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  flex-wrap:wrap;
}

.feedback-card .card-info{max-width:580px}
.feedback-card h3{margin:0 0 6px;font-size:1.12rem;color:var(--fg)}
.feedback-card p{margin:0;font-size:.94rem;color:var(--muted)}
.card-btn-group{display:flex;gap:10px;flex-wrap:wrap;align-items:center}

/* Telegram */
.telegram-card{
  border-color:color-mix(in srgb,#229ED9 35%,var(--line));
}

.telegram-card .telegram-icon{
  flex:none;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  border-radius:12px;
  background:rgba(34,158,217,.12);
  color:#229ED9;
}

.telegram-card .telegram-icon svg{
  width:25px;
  height:25px;
  display:block;
}

.telegram-btn{
  background:#229ED9;
  color:#ffffff;
}

.telegram-btn:hover{
  background:#168ac1;
  color:#ffffff;
  transform:translateY(-1px);
}

.telegram-link{
  display:inline-flex;
  align-items:center;
  gap:7px;
  color:var(--accent);
  text-decoration:none;
  font-weight:600;
}

.telegram-link:hover{text-decoration:underline}

/* Footer */
footer.foot{
  border-top:1px solid var(--line);
  padding-block:28px;
  color:var(--muted);
  font-size:.9rem;
  background:var(--surface);
}

.foot .wrap{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
}

.footer-right{
  display:flex;
  justify-content:flex-end;
  align-items:center;
  gap:16px;
  flex-wrap:wrap;
}

/* Toast */
.toast{
  position:fixed;
  inset-inline:16px;
  bottom:calc(20px + env(safe-area-inset-bottom,0px));
  z-index:100;
  margin-inline:auto;
  width:fit-content;
  max-width:100%;
  background:var(--fg);
  color:var(--bg);
  padding:12px 18px;
  border-radius:12px;
  font-size:.92rem;
  font-weight:500;
  box-shadow:0 10px 30px rgba(0,0,0,.22);
}

.toast[hidden]{display:none}

@media (max-width:640px){
  .feedback-card{padding:20px}
  .card-btn-group,.feedback-card .btn{width:100%}
  .member-item{align-items:flex-start;flex-direction:column;gap:4px}
  .footer-right{justify-content:flex-start}
  .search-input{max-width:none;width:100%}
  .preview-meta-header{padding:16px}
  .preview-select{max-width:100%;width:100%}
  .admin-form-grid{grid-template-columns:1fr}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
}