/* RTI visual system: consistent white/slate and navy/coral surfaces. */
:root,[data-theme="light"]{
  color-scheme:light;
  --brand:#8c2344;--brand-dark:#6c1833;--brand-light:#fff0f4;
  --brand-fill:#8c2344;--brand-fill-hover:#721b37;--brand-edge:#8c2344;
  --accent:#16734f;--accent-dark:#115b3e;
  --ink:#101b30;--text:var(--ink);--body:#475569;--muted:#5b6b82;--line:#dce3ef;
  --bg:#f5f7fb;--card:#fff;--surface:#eef2f8;--surface-hover:#e8edf6;
  --header-bg:rgba(255,255,255,.97);--danger:#b91c1c;--warning:#a16207;
  --radius:16px;--radius-sm:10px;
  --shadow:0 2px 5px rgba(15,23,42,.025),0 12px 32px rgba(15,23,42,.055);
  --shadow-lg:0 10px 24px rgba(15,23,42,.05),0 24px 64px rgba(15,23,42,.1);
  --ring:0 0 0 3px rgba(140,35,68,.13);
  --font:"Inter","Nirmala UI","Segoe UI",system-ui,-apple-system,sans-serif;
}
[data-theme="dark"]{
  color-scheme:dark;
  --brand:#f4a4b7;--brand-dark:#ffd0dd;--brand-light:#352033;
  --brand-fill:#a53558;--brand-fill-hover:#b43b60;--brand-edge:#cc6b89;
  --accent:#20764f;--accent-dark:#298859;
  --ink:#f8fafc;--text:var(--ink);--body:#c4cede;--muted:#a0aec2;--line:#2b3a52;
  --bg:#090f1c;--card:#131d2f;--surface:#1a2740;--surface-hover:#22314c;
  --header-bg:rgba(13,21,37,.97);--danger:#ffb5bd;--warning:#f0cf8a;
  --shadow:0 2px 8px rgba(0,0,0,.14),0 14px 34px rgba(0,0,0,.2);
  --shadow-lg:0 12px 26px rgba(0,0,0,.18),0 28px 68px rgba(0,0,0,.3);
  --ring:0 0 0 3px rgba(244,164,183,.2);
}
body{-webkit-user-select:text;user-select:text}
.site-header{border-top:3px solid var(--brand-fill);border-bottom:1px solid var(--line);z-index:90;box-shadow:0 3px 16px rgba(15,23,42,.035)}
.nav{min-height:76px}
.brand{font-size:.97rem;letter-spacing:.035em;line-height:1.2}
.brand .logo-img{width:54px;height:54px}
.brand small{font-size:.58rem;letter-spacing:.055em;text-transform:none;margin-top:3px}
.nav-links a{font-size:.83rem;border-radius:8px}
.btn{border-radius:10px;line-height:1.4;min-height:44px;box-shadow:none;transition:background .18s ease,border-color .18s ease,box-shadow .18s ease,transform .18s ease}
.btn-primary{background:var(--brand-fill);color:#fff;border-color:var(--brand-fill)}
.btn-primary:hover{background:var(--brand-fill-hover);color:#fff;border-color:var(--brand-fill-hover);box-shadow:0 6px 18px rgba(140,35,68,.16)}
.btn-ghost{background:var(--card);color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{background:var(--surface);color:var(--brand);border-color:var(--brand-edge);box-shadow:none}
.btn-accent{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-accent:hover{background:var(--accent-dark);color:#fff;border-color:var(--accent-dark);box-shadow:none}
.card{border-radius:16px;box-shadow:var(--shadow)}
.card:hover{border-color:var(--brand-edge);transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.eyebrow{font-size:.72rem;font-weight:750;letter-spacing:.08em;padding:7px 12px;border:1px solid color-mix(in srgb,var(--brand) 15%,transparent)}
.section-title{font-size:clamp(1.65rem,3vw,2.4rem);letter-spacing:-.025em;line-height:1.3}
.section-sub{font-size:.97rem;line-height:1.75;color:var(--body)}
.page-head{background:radial-gradient(ellipse at 95% 0,rgba(140,35,68,.4),transparent 55%),linear-gradient(125deg,#152137,#263950);padding:58px 0;border-bottom:1px solid var(--line)}
.page-head h1{font-weight:750;letter-spacing:-.025em;color:#fff}
.page-head p{color:#d4ddea;line-height:1.75}
.section{padding-top:72px;padding-bottom:72px}
.feature .f-ico{width:50px;height:50px;border-radius:14px;background:var(--brand-light);color:var(--brand);border:1px solid color-mix(in srgb,var(--brand) 13%,transparent)}
.feature h3{font-size:1.05rem;line-height:1.35}
.feature p{color:var(--body);line-height:1.7}
.site-footer{background:#0d1627;color:#b5c2d6;border-top:1px solid #2b3a52;margin-top:0}
.site-footer a{color:#c1cee0}
.site-footer a:hover{color:#fff}
.site-footer .footer-bottom,.site-footer .footer-login-group{border-color:#2b3a52}
:focus-visible{outline:3px solid var(--brand);outline-offset:3px}
@media(max-width:720px){.nav{min-height:68px}.brand{font-size:.79rem}.brand .logo-img{width:45px;height:45px}.brand small{font-size:.51rem}.page-head{padding:40px 0}.section{padding-top:48px;padding-bottom:48px}.section-sub{font-size:.92rem}}

/* The brand and admission links keep their own row before the page navigation. */
.site-header .nav{
  display:grid;grid-template-columns:minmax(0,1fr) auto;
  gap:8px 24px;min-height:76px;padding:12px 20px 8px;
}
.site-header .nav .brand{max-width:none;min-width:0;gap:12px}
.site-header .nav .brand .logo-img{width:54px;height:54px;flex:0 0 54px}
.site-header .nav .brand .brand-copy{
  display:block;min-width:0;overflow:visible;text-overflow:clip;white-space:normal;
}
.site-header .nav .brand .brand-name{
  display:block;font-size:1.05rem;letter-spacing:.01em;
  overflow:visible;text-overflow:clip;white-space:normal;
}
.site-header .nav .brand small{
  display:block;font-size:.68rem;line-height:1.45;letter-spacing:.015em;
  white-space:normal;margin-top:4px;
}
.site-header .nav-links{
  grid-column:1/-1;display:flex;position:static;flex-direction:row;
  align-items:center;justify-content:center;gap:4px;
  padding:6px 0 0;border-top:1px solid var(--line);border-bottom:0;background:transparent;
}
.site-header .nav-links>a{font-size:.85rem;padding:9px 14px;white-space:nowrap}
.site-header .nav-actions{grid-column:2;grid-row:1;display:flex;gap:10px;flex:none}
.site-header .desk-auth{display:flex;gap:10px}
.site-header .desk-auth .btn{font-size:.82rem;padding:10px 14px}
.site-header .mob-auth{display:none}
.site-header .mob-auth .btn-primary{background:#762e40;color:#fff}
.site-header .mob-auth .btn-primary:hover{background:#572133;color:#fff}
.site-header .mob-auth .btn-ghost{background:var(--card);color:var(--ink);border-color:var(--line)}
.site-header .mob-auth .btn-ghost:hover{background:var(--card);color:var(--brand);border-color:var(--brand)}
.site-header .theme-btn,.site-header .nav-toggle{
  display:inline-flex;align-items:center;justify-content:center;
  width:44px;min-height:44px;padding:0;flex:none;
}
.site-header .nav-toggle{display:none;font-size:1.35rem;border:1px solid var(--line);border-radius:9px;background:var(--card)}
.site-header .theme-menu{z-index:2;max-width:calc(100vw - 32px)}
@media(max-width:1100px){
  .site-header .nav{padding:12px 20px;gap:12px;min-height:78px}
  .site-header .nav-actions{gap:8px}
  .site-header .desk-auth{display:none}
  .site-header .nav-toggle{display:inline-flex}
  .site-header .nav-links{
    display:none;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
    padding:12px 20px;max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));overflow-y:auto;overscroll-behavior:contain;
    box-shadow:var(--shadow);
  }
  .site-header .nav-links.open{display:flex}
  .site-header .nav-links>a{padding:12px 14px;min-height:44px}
  .site-header .mob-auth{
    display:flex;flex-direction:row;flex-wrap:wrap;gap:10px;
    margin-top:8px;padding:12px 0 0;border-top:1px solid var(--line);
  }
  .site-header .mob-auth .btn{flex:1 1 200px;width:auto;justify-content:center;font-size:.88rem}
}
@media(max-width:600px){
  .site-header .nav{padding:10px 16px;gap:10px;min-height:68px}
  .site-header .nav .brand{gap:8px}
  .site-header .nav .brand .logo-img{width:44px;height:44px;flex-basis:44px}
  .site-header .nav .brand .brand-name{font-size:.88rem;line-height:1.25;letter-spacing:0}
  .site-header .nav .brand small{display:none}
  .site-header .nav-actions{gap:4px}
  .site-header .nav-links{padding:10px 16px}
  .site-header .mob-auth{flex-direction:column}
  .site-header .mob-auth .btn{flex:0 0 auto;width:100%;white-space:normal}
}

/* Presentation refinements preserve the existing navigation behavior above. */
.site-header .nav-links>a{border-radius:8px;font-weight:600;transition:background .18s ease,color .18s ease}
.site-header .nav-links>a:hover{background:var(--surface);color:var(--ink)}
.site-header .nav-links>a.active{background:var(--brand-light);color:var(--brand)}
.site-header .brand:hover{color:var(--ink)}
.site-header .desk-auth .btn{border-radius:9px}
.site-header .mob-auth .btn-primary{background:var(--brand-fill);color:#fff;border-color:var(--brand-fill)}
.site-header .mob-auth .btn-primary:hover{background:var(--brand-fill-hover);color:#fff;border-color:var(--brand-fill-hover)}
.site-header .mob-auth .btn-ghost:hover{background:var(--surface);color:var(--brand);border-color:var(--brand-edge)}
.site-header .theme-btn,.site-header .nav-toggle{background:var(--card);color:var(--ink);border-color:var(--line);border-radius:10px;box-shadow:0 2px 4px rgba(15,23,42,.025)}
.site-header .theme-btn:hover,.site-header .nav-toggle:hover{background:var(--surface);border-color:var(--brand-edge)}
.theme-menu{background:var(--card);border-color:var(--line);border-radius:14px;box-shadow:var(--shadow-lg);padding:8px}
.theme-menu button{min-height:42px}
.theme-menu button:hover{background:var(--surface)}
.theme-menu button.active{background:var(--brand-light);color:var(--brand)}
.field input,.field select,.field textarea{background:var(--card);color:var(--ink);border-color:var(--line);border-radius:10px;min-height:46px}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--brand-edge);box-shadow:var(--ring)}
input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}
.field input:-webkit-autofill{-webkit-text-fill-color:var(--ink);caret-color:var(--ink);box-shadow:0 0 0 1000px var(--card) inset}
.gallery-filters button.active{background:var(--brand-fill);border-color:var(--brand-fill);color:#fff}
[data-theme="dark"] .page-head{background:radial-gradient(ellipse at 95% 0,rgba(165,53,88,.22),transparent 55%),linear-gradient(125deg,#0d1729,#1a2b46)}
[data-theme="dark"] .badge.green,[data-theme="dark"] .alert.ok,[data-theme="dark"] .quiz-opt.correct{background:#143a2a;color:#b4ebcc;border-color:#357c58}
[data-theme="dark"] .badge.amber{background:#3a301b;color:#f0cf8a}
[data-theme="dark"] .alert.err,[data-theme="dark"] .quiz-opt.wrong{background:#3d2230;color:#ffb5bd;border-color:#b65c73}
[data-theme="dark"] .note code{background:#24334b;color:#f4a4b7}
[data-theme="dark"] .note[style*="linear-gradient"]{background:linear-gradient(135deg,#2e2035,#131d2f)!important}
[data-theme="dark"] .course-card .c-ico{color:color-mix(in srgb,var(--cc,#f4a4b7) 55%,#fff)}
[data-theme="dark"] .site-footer{background:#070d18}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn,.card,.site-header .nav-links>a,.theme-btn,.nav-toggle{transition:none!important}.card:hover{transform:none}}