:root{
--teal:#117c7d;--teal2:#0c5e69;--gold:#f7bd42;--ink:#20333b;--muted:#65757b;
--cream:#fffaf0;--card:#ffffff;--shadow:0 14px 35px rgba(20,60,70,.12);
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Noto Sans Tamil","Latha",system-ui,sans-serif;color:var(--ink);background:#f7fbfa}
a{text-decoration:none;color:inherit}.topbar{height:70px;padding:10px max(18px,calc((100% - 1120px)/2));display:flex;align-items:center;justify-content:space-between;background:#fff;box-shadow:0 2px 15px rgba(0,0,0,.06);position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:10px}.brand-icon{width:44px;height:44px;border-radius:14px;background:linear-gradient(145deg,#168d88,#0d5d69);color:#fff;display:grid;place-items:center;font-family:serif;font-size:28px;box-shadow:0 7px 16px rgba(15,110,110,.25)}.brand strong{display:block;font-size:15px}.brand small{display:block;font-size:11px;color:#74858a;margin-top:2px}.home-link{font-size:13px;font-weight:700;color:var(--teal)}
.hero{position:relative;overflow:hidden;min-height:540px;background:linear-gradient(135deg,#0b5964 0%,#118b82 62%,#55b78e 100%);color:white;display:flex;align-items:center}.hero-content{width:min(1120px,100%);margin:auto;padding:70px 22px;position:relative;z-index:2}.bismillah{font-family:serif;font-size:25px;opacity:.95;margin-bottom:20px}.hero-badge{display:inline-block;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.24);padding:8px 13px;border-radius:999px;font-size:12px;margin-bottom:15px}.hero h1{font-size:clamp(36px,7vw,66px);line-height:1.12;margin:0 0 18px;letter-spacing:-1px}.hero h1 span{color:#ffe19a}.hero p{max-width:620px;font-size:17px;line-height:1.8;color:#e6f8f5;margin-bottom:28px}.primary-btn{display:inline-flex;align-items:center;gap:20px;background:#fff;color:#106d70;padding:15px 20px;border-radius:16px;font-weight:800;box-shadow:0 12px 25px rgba(0,0,0,.16)}.primary-btn span{font-size:20px}.arabic-cloud{position:absolute;right:4%;bottom:45px;font-family:serif;font-size:clamp(38px,6vw,75px);letter-spacing:12px;opacity:.12;white-space:nowrap}.hero-orbit{position:absolute;border:1px solid rgba(255,255,255,.13);border-radius:50%}.orbit1{width:480px;height:480px;right:-160px;top:-100px}.orbit2{width:700px;height:700px;right:-260px;top:-210px}
.welcome,.how,.lesson-page{max-width:1120px;margin:auto;padding:50px 18px}.section-title{display:flex;gap:13px;align-items:center;margin-bottom:22px}.section-title>span{font-size:30px}.section-title h2{margin:0;font-size:26px}.section-title p{margin:3px 0;color:var(--muted);font-size:13px}.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.feature-card{background:#fff;border-radius:22px;padding:22px;min-height:155px;box-shadow:var(--shadow);position:relative;border:1px solid rgba(0,0,0,.03);transition:.2s}.feature-card:hover{transform:translateY(-3px)}.feature-icon{font-size:34px;margin-bottom:8px}.feature-card h3{margin:0 0 6px;font-size:18px}.feature-card p{margin:0;color:#64757a;font-size:13px;line-height:1.65;max-width:480px}.feature-card b{display:block;margin-top:12px;font-size:12px;color:var(--teal)}.c1{background:linear-gradient(135deg,#effff9,#fff)}.c2{background:linear-gradient(135deg,#fff7e6,#fff)}.c3{background:linear-gradient(135deg,#f2f0ff,#fff)}.c4{background:linear-gradient(135deg,#eff7ff,#fff)}.locked{opacity:.8}.how{padding-top:20px}.how h2{text-align:center}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:20px}.steps>div{background:#fff;padding:20px;border-radius:20px;text-align:center;box-shadow:0 8px 25px rgba(20,60,70,.08)}.steps span{display:grid;place-items:center;width:36px;height:36px;margin:auto auto 10px;border-radius:50%;background:#e6f7f3;color:var(--teal);font-weight:900}.steps strong{display:block}.steps p{font-size:12px;line-height:1.6;color:var(--muted)}footer{text-align:center;padding:30px 15px;color:#7b8a8e;font-size:11px}
.lesson-head{text-align:center;padding-bottom:25px}.mini-badge{display:inline-block;color:var(--teal);background:#e7f8f4;padding:7px 12px;border-radius:999px;font-size:12px;font-weight:800}.lesson-head h1{font-size:clamp(27px,5vw,42px);margin:12px 0 7px}.lesson-head p{color:var(--muted);margin:0;font-size:14px}.letter-layout{display:grid;grid-template-columns:1.3fr .7fr;gap:18px}.letter-board{background:#fff;border-radius:28px;padding:25px;box-shadow:var(--shadow);text-align:center}.progress-row{display:flex;justify-content:space-between;color:#77878b;font-size:12px;font-weight:700}.main-letter{font-family:serif;font-size:170px;line-height:1;color:var(--teal);height:190px;display:flex;align-items:center;justify-content:center;padding:0;margin:0 0 8px}.letter-name{font-size:24px;font-weight:900}.tamil-help{font-size:17px;color:#7b5c15;background:#fff7df;display:inline-block;padding:7px 13px;border-radius:12px;margin-top:7px}.sample{font-family:serif;font-size:34px;margin:15px 0;color:#263b41}.listen-btn{border:0;background:linear-gradient(135deg,#f4bd40,#ef9e3e);color:#fff;padding:13px 20px;border-radius:14px;font-size:14px;font-weight:900;cursor:pointer;box-shadow:0 8px 18px rgba(239,158,62,.24)}.listen-btn:active{transform:scale(.97)}.audio-note{font-size:11px;color:#849195;max-width:520px;margin:14px auto;line-height:1.6}.nav-buttons{display:flex;gap:10px;justify-content:center;margin-top:17px}.nav-buttons button{border:1px solid #dce7e5;background:#f7fbfa;color:var(--ink);padding:10px 14px;border-radius:12px;font-weight:800;cursor:pointer}.nav-buttons button:last-child{background:var(--teal);border-color:var(--teal);color:#fff}.letter-list{background:#fff;border-radius:28px;padding:20px;box-shadow:var(--shadow);align-self:start}.letter-list h2{font-size:18px;margin:0 0 15px}.letters-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.letter-chip{border:1px solid #e5eeee;background:#f8fbfa;border-radius:14px;min-height:64px;cursor:pointer;color:var(--ink);position:relative}.letter-chip span{display:block;font-family:serif;font-size:28px;color:var(--teal)}.letter-chip small{font-size:9px;color:#9aa8ab}.letter-chip.active{background:#e5f7f3;border-color:#70c8ba;box-shadow:inset 0 0 0 2px #d2f0e9}.letter-chip:hover{transform:translateY(-1px)}
@media(max-width:800px){.topbar{height:62px}.home-link{font-size:11px}.hero{min-height:570px}.hero-content{padding:48px 20px}.arabic-cloud{right:-100px;bottom:30px}.feature-grid{grid-template-columns:1fr}.steps{grid-template-columns:repeat(2,1fr)}.letter-layout{grid-template-columns:1fr}.letter-list{order:2}.main-letter{font-size:140px;height:165px;margin-bottom:8px}.lesson-page{padding-top:30px}}
@media(max-width:480px){.brand small{font-size:9px}.brand strong{font-size:13px}.hero h1{font-size:39px}.hero p{font-size:15px}.primary-btn{width:100%;justify-content:center}.steps{grid-template-columns:1fr 1fr}.letter-board{padding:18px 13px;border-radius:23px}.main-letter{font-size:125px;height:150px;margin-bottom:8px}.letters-grid{grid-template-columns:repeat(4,1fr)}.letter-chip{min-height:58px}.letter-chip span{font-size:25px}}

.next-lesson{text-align:center;margin:22px 0 10px}.next-lesson a{display:inline-block;background:#fff3d4;color:#936617;border:1px solid #f1d995;padding:12px 18px;border-radius:14px;font-weight:900;font-size:13px}

/* Stage 7 completion UI */
.completion-box{text-align:center;padding:28px 16px}.completion-icon{font-size:54px}.completion-badge{display:inline-block;margin:8px 0;padding:6px 13px;border-radius:999px;background:#dff8eb;color:#11734e;font-weight:900;font-size:13px}.completion-box h2{margin:8px 0;font-size:24px}.completion-box p{color:#64748b}.completion-actions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:20px}.completion-actions a,.progress-btn{display:inline-block;text-decoration:none;padding:12px 16px;border-radius:13px;font-weight:800}.next-lesson-btn{background:#1464d2;color:#fff}.progress-btn{background:#eef5ff;color:#1464d2}.finish-btn{background:#16a36b!important;color:#fff!important}.completion-inline{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:center;padding:10px}.completion-inline strong{color:#169a67}.completion-inline a{font-weight:800;color:#1464d2;text-decoration:none}