/* Üst çubuk, sayfa yerleşimi ve kenar menü */
/* ---------- Üst çubuk ---------- */
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:12px;height:62px;padding:0 16px;background:var(--bg);background:color-mix(in srgb,var(--bg) 84%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);flex:none}
.brand-mark{width:36px;height:36px}
.brand-mark rect{fill:var(--ink)} .brand-mark path{fill:none;stroke:var(--bg);stroke-width:2.2;stroke-linejoin:round} .brand-mark circle{fill:none;stroke:var(--amber);stroke-width:2}
.brand-txt{display:flex;flex-direction:column;line-height:1.1}
.brand-txt b{font:600 1.08rem var(--font-display)} .brand-txt small{font-size:.72rem;color:var(--ink-3);letter-spacing:.02em}
.search-trigger{margin-left:auto;display:flex;align-items:center;gap:10px;min-width:0;width:min(360px,34vw);height:40px;padding:0 10px 0 12px;border:1px solid var(--line-2);border-radius:10px;background:var(--paper);color:var(--ink-3);cursor:pointer;font-size:.9rem;text-align:left}
.search-trigger span{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search-trigger svg{width:18px;height:18px;flex:none}
.tools{display:flex;align-items:center;gap:4px}
.icon-btn{display:inline-grid;place-items:center;min-width:40px;height:40px;padding:0 8px;border:1px solid transparent;border-radius:10px;background:none;cursor:pointer;color:var(--ink-2);font-weight:600;font-size:.85rem}
.icon-btn:hover{background:var(--paper);border-color:var(--line)}
.icon-btn.on{background:var(--ink);color:var(--bg)}
.icon-btn svg,.search-trigger svg,.ico{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.menu-btn{display:none}
.font-ctl{display:inline-flex}
@media (max-width:960px){.menu-btn{display:inline-grid}.brand-txt small{display:none}}
@media (max-width:480px){.topbar{gap:2px;padding:0 6px}.tools{gap:0}.icon-btn{min-width:34px;padding:0 4px}.brand{gap:7px}.brand-mark{width:30px;height:30px}.brand-txt b{font-size:.92rem}}
@media (max-width:720px){.search-trigger span,.search-trigger kbd{display:none}.search-trigger{width:40px;padding:0;justify-content:center;flex:none}.font-ctl,#presentBtn{display:none}.brand-txt b{font-size:1rem}.topbar{gap:6px;padding:0 10px}}


/* ---------- Yerleşim ---------- */
.layout{display:grid;grid-template-columns:276px minmax(0,1fr);min-height:calc(100vh - 62px)}
.sidebar{position:sticky;top:62px;height:calc(100vh - 62px);overflow-y:auto;border-right:1px solid var(--line);padding:18px 12px 48px;background:var(--paper);background:color-mix(in srgb,var(--paper) 55%,transparent)}
main{padding:30px clamp(16px,4vw,52px) 90px;min-width:0;outline:none}
.page{max-width:1140px;margin:0 auto;animation:fadeIn .28s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
#scrim{display:none;position:fixed;inset:62px 0 0 0;background:rgba(0,0,0,.35);z-index:55}
@media (max-width:960px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:fixed;left:0;top:62px;bottom:0;height:auto;width:296px;z-index:60;transform:translateX(-102%);transition:transform .25s ease;background:var(--paper)}
  body.nav-open .sidebar{transform:none;box-shadow:var(--shadow-lg)} body.nav-open #scrim{display:block}
}
html.present .sidebar{display:none} html.present .layout{grid-template-columns:1fr} html.present .page{max-width:1300px}


/* ---------- Kenar menü ---------- */
.side-sec{font:600 .7rem var(--font-ui);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);margin:18px 10px 8px}
.side-link{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:9px;color:var(--ink);text-decoration:none;font-weight:500;font-size:.93rem}
.side-link:hover{background:var(--soft)} .side-link.on{background:var(--ink);color:var(--bg)}
.side-link .ico{width:18px;height:18px}
.side-theme{border-radius:10px;margin-bottom:2px}
.side-theme summary{list-style:none;display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:9px;cursor:pointer;font-weight:600;font-size:.92rem;user-select:none}
.side-theme summary::-webkit-details-marker{display:none}
.side-theme summary:hover{background:var(--soft)}
.side-theme summary::after{content:"";margin-left:auto;width:7px;height:7px;border-right:1.6px solid var(--ink-3);border-bottom:1.6px solid var(--ink-3);transform:rotate(-45deg);transition:transform .2s}
.side-theme[open] summary::after{transform:rotate(45deg)}
.side-theme summary.on{color:var(--c)}
.tnum{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:7px;background:var(--c);color:var(--bg);font:600 .78rem var(--font-mono);flex:none}
.side-topic{display:flex;gap:8px;padding:6px 10px 6px 44px;border-radius:8px;color:var(--ink-2);text-decoration:none;font-size:.87rem;line-height:1.35;position:relative}
.side-topic span{font-family:var(--font-mono);font-size:.74rem;color:var(--ink-3);padding-top:2px;min-width:26px}
.side-topic:hover{background:var(--soft);color:var(--ink)}
.side-topic.on{color:var(--ink);background:var(--soft);font-weight:600}
.side-topic.on::before{content:"";position:absolute;left:30px;top:9px;bottom:9px;width:3px;border-radius:2px;background:var(--c)}