:root {
  color-scheme: light;
  --bg: #f6efe6;
  --bg-soft: #fbf7f0;
  --surface: #fffaf2;
  --surface-strong: #ffffff;
  --ink: #17202a;
  --muted: #5f6b7a;
  --line: #ded4c6;
  --accent: #24577a;
  --accent-dark: #173a60;
  --accent-soft: #e6f1f5;
  --gold: #b8892e;
  --danger: #8a4e00;
  --shadow: 0 20px 55px rgba(23, 32, 42, 0.10);
  --radius: 22px;
  --max-width: 1160px;
  --article-width: 820px;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { color-scheme: dark; --bg:#101923; --bg-soft:#111f2d; --surface:#172535; --surface-strong:#1d2d3e; --ink:#edf4f7; --muted:#b6c6cf; --line:#314659; --accent:#75c7df; --accent-dark:#a9e4f1; --accent-soft:rgba(117,199,223,.13); --gold:#e0b762; --danger:#ffd28a; --shadow:0 20px 55px rgba(0,0,0,.28); } }
:root[data-theme="dark"] { color-scheme: dark; --bg:#101923; --bg-soft:#111f2d; --surface:#172535; --surface-strong:#1d2d3e; --ink:#edf4f7; --muted:#b6c6cf; --line:#314659; --accent:#75c7df; --accent-dark:#a9e4f1; --accent-soft:rgba(117,199,223,.13); --gold:#e0b762; --danger:#ffd28a; --shadow:0 20px 55px rgba(0,0,0,.28); }
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65;color:var(--ink);background:radial-gradient(circle at 12% 0%,rgba(184,137,46,.16),transparent 30rem),radial-gradient(circle at 95% 10%,rgba(36,87,122,.12),transparent 28rem),linear-gradient(180deg,var(--bg-soft) 0%,var(--bg) 100%)} body::before{content:"";position:fixed;inset:0;pointer-events:none;background-image:linear-gradient(rgba(127,127,127,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(127,127,127,.035) 1px,transparent 1px);background-size:44px 44px;mask-image:linear-gradient(to bottom,rgba(0,0,0,.42),transparent 70%)} img{max-width:100%;height:auto} a{color:var(--accent)} a:hover{color:var(--accent-dark)} .skip-link{position:absolute;left:1rem;top:-4rem;z-index:100;padding:.75rem 1rem;border-radius:999px;color:#fff;background:var(--accent-dark);transition:top .2s}.skip-link:focus{top:1rem}.site-header{position:sticky;top:0;z-index:20;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(12px)}.header-inner,.section,.footer-inner{width:min(var(--max-width),calc(100% - 2rem));margin:0 auto}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.95rem 0}.brand{display:inline-flex;flex-direction:column;gap:.1rem;color:var(--ink);text-decoration:none;min-width:0}.brand-name{font-family:Georgia,"Times New Roman",serif;font-size:1.2rem;font-weight:700;letter-spacing:.01em}.brand-subtitle{color:var(--muted);font-size:.84rem}.header-actions{display:flex;gap:.5rem;align-items:center}.nav-toggle,.theme-toggle,.language-switcher a{border:1px solid var(--line);border-radius:999px;padding:.55rem .78rem;color:var(--ink);background:var(--surface-strong);cursor:pointer;font:inherit;text-decoration:none;white-space:nowrap}.language-switcher{display:flex;gap:.35rem;align-items:center}.language-switcher a[aria-current="true"],.language-switcher a:hover{background:var(--accent-soft);color:var(--accent-dark)}.nav-toggle{display:none}.site-nav{display:flex;align-items:center;gap:.25rem}.site-nav a{border-radius:999px;padding:.55rem .72rem;color:var(--muted);text-decoration:none;font-size:.94rem;transition:.2s}.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--accent-dark);background:var(--accent-soft)}main{position:relative}.hero{width:min(var(--max-width),calc(100% - 2rem));margin:0 auto;padding:5.6rem 0 3.4rem}.hero-grid{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(280px,.82fr);gap:2rem;align-items:center}.eyebrow{margin:0 0 .85rem;color:var(--gold);font-weight:800;letter-spacing:.12em;text-transform:uppercase;font-size:.78rem}h1,h2,h3{margin:0 0 .75rem;line-height:1.15;color:var(--ink)}h1{max-width:14ch;font-family:Georgia,"Times New Roman",serif;font-size:clamp(2.45rem,8vw,5.8rem);letter-spacing:-.058em}.page-title{max-width:920px;font-size:clamp(2.25rem,6vw,4.55rem)}h2{font-family:Georgia,"Times New Roman",serif;font-size:clamp(1.7rem,4vw,2.9rem);letter-spacing:-.035em}h3{font-size:1.15rem}.lead{max-width:820px;margin:0 0 1.4rem;color:var(--muted);font-size:clamp(1.06rem,2.5vw,1.28rem)}.hero-card,.card,.panel,.box,.course-box,.offer-box,.contact-box,.info-box,.profile-card,.article-card{border:1px solid var(--line);border-radius:var(--radius);background:color-mix(in srgb,var(--surface) 92%,transparent);box-shadow:var(--shadow);padding:1.35rem}.hero-card{position:relative;overflow:hidden}.hero-card::before{content:"";display:block;aspect-ratio:16/9;border-radius:18px;margin-bottom:1rem;background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 22%,transparent),color-mix(in srgb,var(--gold) 24%,transparent)),radial-gradient(circle at 20% 20%,var(--surface-strong),transparent 35%)}.metric-list{display:grid;gap:.85rem;margin:1rem 0 0}.metric{padding:.9rem;border-radius:14px;background:color-mix(in srgb,var(--surface-strong) 65%,transparent)}.metric strong{display:block;color:var(--accent-dark)}.button-row{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.4rem}.button,.button-secondary,.button-disabled{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;border:1px solid transparent;border-radius:999px;padding:.78rem 1.05rem;font-weight:700;text-decoration:none;transition:.2s}.button{color:#fff;background:var(--accent);box-shadow:0 10px 20px rgba(35,79,126,.18)}.button:hover{color:#fff;background:var(--accent-dark);transform:translateY(-1px)}.button-secondary{color:var(--accent-dark);border-color:var(--line);background:color-mix(in srgb,var(--surface-strong) 72%,transparent)}.button-secondary:hover{background:var(--accent-soft);transform:translateY(-1px)}.button-disabled{color:var(--muted);border-color:var(--line);background:color-mix(in srgb,var(--surface-strong) 55%,transparent);cursor:not-allowed;opacity:.75}.section{padding:2.8rem 0}.section-header{max-width:820px;margin-bottom:1.4rem}.section-header p,.card p,.panel p,.profile-card p,.article-card p{color:var(--muted)}.grid{display:grid;gap:1rem}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.tag-list{display:flex;flex-wrap:wrap;gap:.55rem;padding:0;margin:1rem 0 0;list-style:none}.tag-list li,.tag{display:inline-flex;border:1px solid color-mix(in srgb,var(--accent) 22%,transparent);border-radius:999px;padding:.35rem .65rem;color:var(--accent-dark);background:var(--accent-soft);font-size:.9rem}.page-hero{width:min(var(--max-width),calc(100% - 2rem));margin:0 auto;padding:4rem 0 1.6rem}.course-card h2,.offer-card h2{font-size:1.55rem}.resource-list{display:grid;gap:.75rem;padding:0;margin:1rem 0 0;list-style:none}.resource-list a{display:block;border:1px solid var(--line);border-radius:14px;padding:.85rem;text-decoration:none;background:color-mix(in srgb,var(--surface-strong) 65%,transparent)}.resource-list a span{display:block;color:var(--muted);font-size:.92rem}.callout{border-left:5px solid var(--gold);padding:1.2rem 1.3rem;border-radius:16px;background:color-mix(in srgb,var(--gold) 12%,transparent)}.steps{counter-reset:steps;padding:0;list-style:none}.steps li{counter-increment:steps;position:relative;margin:0 0 .8rem;padding:.9rem 1rem .9rem 3.1rem;border:1px solid var(--line);border-radius:14px;background:color-mix(in srgb,var(--surface-strong) 58%,transparent)}.steps li::before{content:counter(steps);position:absolute;left:.9rem;top:.85rem;display:grid;width:1.55rem;height:1.55rem;place-items:center;border-radius:50%;color:#fff;background:var(--accent);font-size:.85rem;font-weight:800}code{border-radius:6px;padding:.12rem .3rem;background:color-mix(in srgb,var(--ink) 8%,transparent)}.article-layout{width:min(var(--max-width),calc(100% - 2rem));margin:0 auto;display:grid;grid-template-columns:260px minmax(0,var(--article-width));gap:1.4rem;align-items:start}.toc{position:sticky;top:6.2rem}.toc ul{padding-left:1rem;margin-bottom:0}.article-content{max-width:var(--article-width)}.article-content p,.article-content li{font-size:1.03rem}.math-block{overflow-x:auto;margin:1rem 0;padding:1rem;border:1px solid var(--line);border-radius:14px;background:color-mix(in srgb,var(--surface-strong) 62%,transparent)}.profile-frame{aspect-ratio:1;display:grid;place-items:center;border-radius:22px;overflow:hidden;border:1px solid var(--line);background:var(--accent-soft)}.profile-frame img{width:100%;height:100%;object-fit:cover}.profile-placeholder{display:grid;place-items:center;width:100%;height:100%;padding:1rem;text-align:center;color:var(--muted)}.email-route{display:grid;gap:.75rem}.email-reveal{min-height:1.6rem;color:var(--muted)}.todo-email{color:var(--danger);font-weight:800}.site-footer{margin-top:3rem;border-top:1px solid var(--line);background:color-mix(in srgb,var(--surface) 90%,transparent)}.footer-inner{display:grid;grid-template-columns:1fr auto;gap:1rem;padding:2rem 0;color:var(--muted);font-size:.95rem}.footer-links{display:flex;flex-wrap:wrap;gap:.75rem}.footer-links a{color:var(--muted);text-decoration:none}.footer-links a:hover{color:var(--accent-dark)}@media(max-width:1040px){.header-inner{align-items:flex-start}.nav-toggle{display:inline-flex}.site-nav{position:absolute;left:1rem;right:1rem;top:4.7rem;display:none;flex-direction:column;align-items:stretch;padding:.75rem;border:1px solid var(--line);border-radius:18px;background:var(--surface-strong);box-shadow:var(--shadow)}.site-nav.is-open{display:flex}.site-nav a{padding:.8rem 1rem}.hero-grid,.grid-2,.grid-3,.footer-inner{grid-template-columns:1fr}.hero{padding-top:3.4rem}}@media(max-width:980px){.article-layout{grid-template-columns:1fr}.toc{position:static}}@media(max-width:540px){.header-inner,.section,.page-hero,.hero,.footer-inner,.article-layout{width:min(100% - 1.25rem,var(--max-width))}.brand-subtitle{display:none}.button,.button-secondary,.button-disabled{width:100%}.theme-toggle,.language-switcher a{padding:.52rem .65rem;font-size:.92rem}.header-actions{gap:.35rem}}