/* GSON Study Hub — Phase 1 shared tokens and layouts */
:root{color-scheme:dark;--bg:#1b142b;--surface:#302444;--surface2:#392b52;--ink:#fff;--muted:#d2c2e6;--border:#59436f;--accent:#c9a9ff;--accent-ink:#21132f;--focus:#e9d7ff;--hero1:#4c2b75;--hero2:#21152f;--shadow:0 14px 35px #100a1e55}
html[data-theme=light]{color-scheme:light;--bg:#f7f7fa;--surface:#fff;--surface2:#f0ebf8;--ink:#292536;--muted:#514a61;--border:#d9d0e6;--accent:#7651b8;--accent-ink:#fff;--focus:#553493;--hero1:#e7d9fa;--hero2:#faf8ff;--shadow:0 12px 30px #4b386219}
html[data-theme=dark]{color-scheme:dark;--bg:#15131c;--surface:#292535;--surface2:#332e40;--ink:#f7f5fa;--muted:#d1cbdc;--border:#554d63;--accent:#b49bfa;--accent-ink:#20152f;--focus:#ddd0ff;--hero1:#3a3052;--hero2:#191520;--shadow:0 12px 30px #05040855}
html[data-theme=slate]{color-scheme:dark;--bg:#1f2937;--surface:#37465c;--surface2:#41536b;--ink:#fff;--muted:#d5e0ee;--border:#687b93;--accent:#c2cbff;--accent-ink:#1d2941;--focus:#e0e6ff;--hero1:#475b79;--hero2:#202c3b;--shadow:0 12px 30px #10192455}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,-apple-system,Segoe UI,sans-serif}a{color:inherit}button,select{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid var(--focus);outline-offset:3px}button,select,a.action{min-height:44px}.shell{max-width:1120px;margin:auto;padding:0 20px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:20px;padding-bottom:18px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;letter-spacing:-.02em}.brand-mark{display:grid;place-items:center;width:39px;height:39px;border:1px solid var(--border);border-radius:12px;background:var(--surface);color:var(--accent);font-size:23px}.settings-button{border:1px solid var(--border);border-radius:12px;padding:9px 14px;background:var(--surface);color:var(--ink)}.hero{background:radial-gradient(circle at 90% 5%,#a67de63d,transparent 40%),linear-gradient(120deg,var(--hero1),var(--hero2));border:1px solid var(--border);border-radius:26px;padding:clamp(22px,5vw,48px);box-shadow:var(--shadow)}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.14em;font-weight:800;color:var(--accent)}h1{font-size:clamp(30px,5vw,52px);line-height:1.08;letter-spacing:-.045em;margin:10px 0 14px}h2{font-size:clamp(21px,3vw,29px);letter-spacing:-.025em;margin:0}h3{margin:0;font-size:18px}.hero p{max-width:660px;color:var(--muted);margin:0}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.action{display:inline-flex;align-items:center;justify-content:center;text-align:center;gap:8px;border:1px solid var(--border);border-radius:12px;padding:10px 16px;text-decoration:none;font-weight:750;background:var(--surface);color:var(--ink)}.action.primary{background:var(--accent);color:var(--accent-ink);border-color:transparent}.main{padding-top:26px;padding-bottom:70px}.section-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:28px 0 15px}.section-header p{margin:3px 0 0;color:var(--muted);font-size:14px}.term{background:var(--surface);border:1px solid var(--border);border-radius:22px;overflow:hidden;margin-bottom:16px}.term-toggle{display:flex;justify-content:space-between;align-items:center;width:100%;padding:19px 22px;background:transparent;border:0;color:var(--ink);text-align:left;font-weight:800;font-size:19px}.term-toggle small{display:block;font-weight:500;color:var(--muted);font-size:13px}.term-body{padding:0 18px 20px}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.course-tile{display:flex;flex-direction:column;gap:8px;min-height:142px;padding:18px;border-radius:17px;border:1px solid var(--border);background:linear-gradient(145deg,var(--surface2),var(--surface));text-decoration:none;transition:transform .15s,border-color .15s}.course-tile:hover{transform:translateY(-2px);border-color:var(--accent)}.course-icon{font-size:27px}.course-tile strong{font-size:17px}.course-tile span:last-child{font-size:13px;color:var(--muted)}.panel{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:20px;margin:16px 0}.muted{color:var(--muted)}.small{font-size:13px}.course-head{display:flex;align-items:center;gap:12px;margin-bottom:18px}.exam-group{border-top:1px solid var(--border);padding:16px 0}.exam-group summary{cursor:pointer;font-size:18px;font-weight:800;padding:8px 0}.exam-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px;margin-top:14px}.exam-card{background:var(--surface2);border:1px solid var(--border);border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:8px}.exam-card .action{margin-top:auto}.back{display:inline-block;margin:0 0 15px;color:var(--accent);font-weight:700}.reference-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.ref-card{padding:17px;border:1px solid var(--border);border-radius:15px;background:var(--surface2);text-decoration:none}.ref-card strong{display:block}.settings-panel{margin-top:18px}.settings-panel label{display:block;margin-bottom:8px;font-weight:750}.settings-panel select{background:var(--surface2);color:var(--ink);border:1px solid var(--border);border-radius:12px;padding:10px 12px;min-width:200px}.notice{border-left:3px solid var(--accent);padding:12px 15px;background:var(--surface2);border-radius:9px}.footer{border-top:1px solid var(--border);padding:24px 20px;text-align:center;color:var(--muted);font-size:13px}.hidden{display:none!important}
@media(max-width:420px){.shell{padding-left:14px;padding-right:14px}.brand{font-size:14px}.term-body{padding:0 12px 14px}.course-grid{gap:9px}.course-tile{padding:12px;min-height:145px}.course-tile strong{font-size:15px}.course-tile span:last-child{font-size:12px}.hero{padding:22px}.hero-actions .action{flex:1}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.course-tile{transition:none}.course-tile:hover{transform:none}}

/* Restore the original school SVG; center the hero composition while retaining left-aligned study content. */
.hero-school-brand{display:flex;justify-content:center;margin:0 auto 24px}.hero-school-brand img{display:block;width:min(300px,78vw);height:auto}.hero{text-align:center}.hero p{margin-left:auto;margin-right:auto}.hero-actions{justify-content:center}.brand{line-height:1.25}.footer{max-width:1120px;margin:0 auto;text-align:center}

/* Phase 1 refinement: centered school branding and concise, centered hero. */
.hero{display:flex;flex-direction:column;align-items:center;text-align:center}.hero-school-brand{width:100%;justify-content:center}.hero h1,.hero p{text-align:center}.hero-actions{width:100%;justify-content:center}

/* Navigation clarity and refined hero scale */
.brand{transition:color .15s ease}.brand:hover{color:var(--accent)}.home-icon{display:inline-grid;place-items:center;width:34px;height:34px;flex:0 0 34px;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--accent);font-size:27px;line-height:1}.brand:hover .home-icon{border-color:var(--accent)}.hero h1{font-size:clamp(27px,4vw,44px);max-width:900px}.hero-school-brand img{width:min(360px,82vw)}

/* Answer palette controls in Settings */
.answer-custom-controls{margin-top:18px}.answer-custom-controls[hidden]{display:none}.color-picker-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:12px 0}.color-picker-grid label{font-size:13px}.color-picker-grid input{display:block;width:100%;height:44px;min-width:0;padding:3px;border:1px solid var(--border);border-radius:9px;background:var(--surface2)}.palette-preview-title{margin:20px 0 12px}.preview-answer{display:flex;align-items:center;gap:12px;background:var(--preview-bg)!important;color:var(--preview-fg)!important;padding:12px 14px;border:1px solid var(--border);border-radius:12px;margin:8px 0}.preview-radio{width:16px;height:16px;border:2px solid currentColor;border-radius:50%;flex-shrink:0}#answer-color-reset{margin-top:14px}@media(max-width:480px){.color-picker-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}