/* Learn Tamil — Base elements, header, hero, letter tabs.
   Order matters: files load in number order (see tools/lib/assets.mjs). */
/* ---------- Base ---------- */
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;background:var(--bg);background-image:var(--page-wash);background-attachment:fixed;color:var(--text);font-family:var(--font-ui);font-size:16px;line-height:1.55;-webkit-tap-highlight-color:transparent}
.ta,[lang="ta"]{font-family:var(--font-ta)}
button{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:10px}
.wrap{max-width:1160px;margin:0 auto;padding:0 16px}
.glass{background:var(--glass);border:1px solid var(--glass-line);box-shadow:var(--glass-shadow);backdrop-filter:blur(14px) saturate(1.3);-webkit-backdrop-filter:blur(14px) saturate(1.3);border-radius:20px}
.muted{color:var(--text-muted)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:30;background:var(--header);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.site-header .wrap{display:flex;align-items:center;gap:14px;height:62px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);min-width:0}
.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(145deg,#0078d4,#004f8c);display:grid;place-items:center;color:#fff;font:800 18px var(--font-ta);flex:none}
.brand-name{font-weight:800;letter-spacing:.02em;font-size:15px;line-height:1.1}
.brand-name small{display:block;font-weight:600;color:var(--text-muted);font-size:12px;letter-spacing:0}
.spacer{flex:1}
.icon-btn{border:1px solid var(--border);background:var(--glass);border-radius:12px;width:40px;height:40px;display:grid;place-items:center;cursor:pointer;flex:none}
.icon-btn svg{width:20px;height:20px}

/* ---------- Hero ---------- */
.hero{padding:40px 0 18px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--accent-deep);background:var(--accent-soft);border-radius:999px;padding:5px 12px;letter-spacing:.02em}
.hero h1{font-family:var(--font-ta);font-size:clamp(34px,6vw,56px);line-height:1.2;margin:14px 0 6px;font-weight:800;background:var(--grad-text);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(16px,2.2vw,19px);color:var(--text-muted);max-width:640px;margin:0 0 22px}
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;max-width:760px}
.stat{padding:14px 12px;text-align:center}
.stat b{display:block;font-size:clamp(22px,3.6vw,30px);line-height:1.1;font-weight:800}
.stat span{font-family:var(--font-ta);font-size:14px;color:var(--text-muted)}
.stat.total{background:linear-gradient(135deg,#ff8a3d,#ff5e7e 50%,#7c5cff);border-color:transparent;color:#fff}
.stat:nth-child(1) b{color:var(--c-uyir)} .stat:nth-child(2) b{color:var(--c-mei)} .stat:nth-child(3) b{color:var(--c-ay)} .stat:nth-child(4) b{color:var(--c-um)}
.stat.total span{color:#fff}
.stat.total b{color:#fff}
@media (max-width:620px){.stats{grid-template-columns:repeat(2,1fr)}.stat.total{grid-column:span 2}}

/* ---------- Tabs ---------- */
.tabs{position:sticky;top:62px;z-index:20;padding:10px 0;background:transparent}
.tabs .tablist{background:var(--header)}
.tabs .wrap{overflow-x:auto;scrollbar-width:none}
.tabs .wrap::-webkit-scrollbar{display:none}
.tablist{display:inline-flex;gap:4px;padding:5px;border-radius:14px}
.tab{border:0;background:transparent;border-radius:10px;padding:8px 14px;font-weight:600;cursor:pointer;white-space:nowrap;color:var(--text-muted);font-size:15px}
.tab .ta{font-weight:700}
.tab .n{font-size:12px;margin-left:6px;padding:1px 7px;border-radius:999px;background:var(--accent-soft);color:var(--accent-deep);font-weight:700}
.tab[aria-selected="true"]{background:var(--accent);color:var(--on-accent)}
.tab[aria-selected="true"] .n{background:rgb(255 255 255 / .22);color:inherit}