:root{
  --blue:#2563eb;
  --cyan:#06b6d4;
  --green:#22c55e;
  --yellow:#facc15;
  --red:#ef4444;
  --bg:#f8fafc;
  --text:#0f172a;
  --muted:#64748b;
  --border:#e2e8f0;
  --white:#ffffff;
  --shadow:0 22px 55px rgba(15,23,42,.10);
  --soft-shadow:0 12px 30px rgba(15,23,42,.08);
  --radius:24px;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,Arial,system-ui,-apple-system,sans-serif;line-height:1.6}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
.skip-link{position:absolute;left:16px;top:12px;z-index:100;transform:translateY(-160%);background:var(--blue);color:#fff;padding:10px 16px;border-radius:999px;font-weight:900}
.skip-link:focus{transform:translateY(0)}
.container{width:min(100% - 32px,var(--max));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--border);box-shadow:0 8px 28px rgba(15,23,42,.05);backdrop-filter:blur(16px)}
.nav-shell{min-height:78px;display:flex;align-items:center;gap:18px;justify-content:space-between}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:1.45rem;font-weight:950;letter-spacing:-.04em;white-space:nowrap}
.brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:16px;background:linear-gradient(135deg,var(--blue),var(--green));color:#fff;box-shadow:0 12px 22px rgba(37,99,235,.25);font-weight:950}
.main-nav{display:flex;align-items:center;justify-content:center;gap:3px}
.main-nav a{padding:10px 11px;border-radius:999px;color:#334155;font-size:.92rem;font-weight:850;transition:.2s ease}
.main-nav a:hover,.main-nav a.active{background:#eff6ff;color:var(--blue)}
.nav-actions{display:flex;align-items:center;gap:10px;white-space:nowrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:12px 20px;border-radius:999px;border:1px solid transparent;font-weight:900;line-height:1.1;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;color:var(--text)}
.btn:hover{transform:translateY(-2px);box-shadow:var(--soft-shadow)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 14px 26px rgba(37,99,235,.24)}
.btn-primary:hover{background:#1d4ed8}
.btn-success{background:var(--green);color:#fff;box-shadow:0 14px 26px rgba(34,197,94,.20)}
.btn-success:hover{background:#16a34a}
.btn-warm{background:#fff7d6;color:#854d0e;border-color:#fde68a}
.btn-outline{background:#fff;color:var(--blue);border-color:#bfdbfe}
.btn-ghost{background:#fff;color:#334155;border-color:var(--border)}
.btn-large{min-height:54px;padding:15px 25px;font-size:1rem}
.menu-toggle{display:none;width:48px;height:48px;border:1px solid var(--border);border-radius:18px;background:#fff;color:var(--blue);align-items:center;justify-content:center;flex-direction:column;gap:5px;z-index:60}
.menu-toggle span{display:block;width:23px;height:2px;background:currentColor;border-radius:999px}
.hero,.page-hero{background:linear-gradient(180deg,#fff 0%,#f8fafc 100%)}
.hero{padding:72px 0 54px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:42px;align-items:center}
.hero-copy h1,.page-hero h1{margin:16px 0 18px;font-size:clamp(2.45rem,6vw,5.6rem);line-height:.98;letter-spacing:-.07em;font-weight:950;color:#071225}
.hero-copy p,.page-hero p,.section-heading p{max-width:740px;color:var(--muted);font-size:1.18rem;margin:0}
.eyebrow{display:inline-flex;align-items:center;width:max-content;padding:8px 13px;border-radius:999px;background:#e0f2fe;color:#075985;font-weight:950;font-size:.85rem;letter-spacing:.02em}
.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-card,.card,.lesson-card,.panel-card,.big-grade-card,.stat-card,.form-card,.quiz-wrap{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--soft-shadow)}
.learning-card{padding:34px;position:relative;min-height:360px;background:radial-gradient(circle at top right,#dbeafe,transparent 42%),#fff}
.learning-card h2{font-size:2rem;letter-spacing:-.04em;margin:18px 0 8px}.learning-card p{color:var(--muted);font-size:1.05rem}.progress-ring{width:148px;height:148px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--green) 92%,#e2e8f0 0);color:#fff;font-size:2.1rem;font-weight:950;box-shadow:inset 0 0 0 16px #fff,0 20px 45px rgba(34,197,94,.22)}.mini-stats{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.mini-stats span{background:#f1f5f9;border-radius:999px;padding:9px 12px;font-weight:850;color:#334155}
.section{padding:66px 0}.section.soft{background:#fff}.section-heading{text-align:center;display:grid;justify-items:center;gap:12px;margin-bottom:28px}.section-heading h2,.split-panel h2,.mustafa-box h2{margin:0;font-size:clamp(2rem,4vw,3.35rem);line-height:1.05;letter-spacing:-.055em}.grade-band-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{padding:26px}.card h3,.lesson-card h3,.panel-card h3{margin:0 0 8px;font-size:1.45rem;letter-spacing:-.035em}.card p,.lesson-card p,.panel-card p,.stat-card p,.mustafa-box p,.split-panel p{color:var(--muted);margin:0}.color-blue{background:linear-gradient(135deg,#eff6ff,#fff)}.color-cyan{background:linear-gradient(135deg,#ecfeff,#fff)}.color-green{background:linear-gradient(135deg,#f0fdf4,#fff)}.grade-pills{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:20px}.grade-pill{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--border);border-radius:18px;padding:12px;transition:.2s}.grade-pill:hover{border-color:#93c5fd;transform:translateY(-2px);box-shadow:var(--soft-shadow)}.grade-pill span{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:var(--blue);color:#fff;font-weight:950}.grade-pill small{font-weight:900;color:#334155}.subject-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.subject-card,.panel-card{padding:22px;border-radius:var(--radius);border:1px solid var(--border);background:#fff;box-shadow:0 8px 22px rgba(15,23,42,.05);transition:.2s}.subject-card:hover,.panel-card:hover,.big-grade-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#bfdbfe}.subject-card span{display:grid;place-items:center;width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;font-weight:950;margin-bottom:14px}.subject-card strong{display:block;font-size:1.15rem}.subject-card small{color:var(--muted);font-weight:750}.split-panel,.mustafa-box{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:center;background:#fff;border:1px solid var(--border);border-radius:32px;padding:32px;box-shadow:var(--soft-shadow)}.demo-question{border-radius:24px;background:#f8fafc;border:1px dashed #bfdbfe;padding:24px}.demo-question strong{font-size:1.45rem}.choice-preview{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px}.choice-preview span{display:grid;place-items:center;min-height:52px;border-radius:16px;background:#fff;border:1px solid var(--border);font-weight:950}.choice-preview .is-correct{background:#dcfce7;color:#166534;border-color:#86efac}.card-grid.three{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.mustafa-box{grid-template-columns:1fr auto;background:linear-gradient(135deg,#eff6ff,#ecfeff 55%,#f0fdf4)}
.page-hero{padding:58px 0 34px}.page-hero h1{font-size:clamp(2.25rem,5vw,4.4rem)}.grade-card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.big-grade-card{padding:28px;text-align:center;transition:.2s}.big-grade-card span{display:grid;place-items:center;width:74px;height:74px;border-radius:24px;margin:0 auto 16px;background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;font-size:2rem;font-weight:950}.big-grade-card h2{margin:0 0 8px;letter-spacing:-.04em}.big-grade-card p{margin:0;color:var(--muted)}
.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.lesson-card{padding:24px}.lesson-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:18px;background:#eff6ff;color:var(--blue);font-size:1.35rem;font-weight:950;margin-bottom:14px}.card-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}.card-actions .btn{min-height:42px;padding:11px 15px;font-size:.9rem}
.quiz-wrap{padding:30px;max-width:820px}.quiz-top{display:grid;gap:10px;margin-bottom:24px;color:var(--muted);font-weight:900}.progress{height:12px;background:#e2e8f0;border-radius:999px;overflow:hidden}.progress span{display:block;width:35%;height:100%;background:linear-gradient(90deg,var(--blue),var(--green));border-radius:999px;transition:width .25s ease}.quiz-wrap h2{font-size:2rem;margin:0 0 18px}.answer-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.answer-btn{min-height:62px;border:2px solid var(--border);border-radius:20px;background:#fff;font-weight:950;font-size:1.2rem;color:var(--text);transition:.2s}.answer-btn:hover{border-color:#93c5fd;background:#eff6ff}.answer-btn.correct{background:#dcfce7;border-color:var(--green);color:#166534}.answer-btn.wrong{background:#fee2e2;border-color:var(--red);color:#991b1b}.answer-btn:disabled{cursor:default}.explanation,.demo-response{display:none;margin:18px 0;padding:16px 18px;border-radius:18px;border:1px solid #bae6fd;background:#ecfeff;color:#155e75;font-weight:800}.explanation.show,.demo-response.show{display:block}.dashboard-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}.stat-card{padding:22px}.stat-card span{display:block;color:var(--muted);font-weight:850}.stat-card strong{display:block;font-size:2.1rem;letter-spacing:-.05em;margin:8px 0;color:var(--blue)}.center-cta{text-align:center;margin-top:26px}.form-card{max-width:840px;padding:28px;display:grid;gap:12px}.form-card label{font-weight:950;color:#334155}.form-card textarea,.form-card input,.form-card select{width:100%;border:1px solid var(--border);border-radius:18px;padding:14px 16px;background:#fff;color:var(--text);outline:none}.form-card textarea:focus,.form-card input:focus,.form-card select:focus{border-color:#93c5fd;box-shadow:0 0 0 4px #dbeafe}
.site-footer{padding:36px 0;background:#0f172a;color:#cbd5e1}.footer-grid{display:flex;justify-content:space-between;gap:24px;align-items:center}.footer-brand{color:#fff}.site-footer p{margin:12px 0 0;color:#94a3b8}.footer-links{display:flex;gap:12px;flex-wrap:wrap}.footer-links a{padding:9px 12px;border-radius:999px;background:rgba(255,255,255,.08);font-weight:850}.footer-links a:hover{background:rgba(255,255,255,.16)}
@media (max-width:1200px){.main-nav{position:fixed;left:16px;right:16px;top:86px;display:none;grid-template-columns:1fr;gap:8px;background:#fff;border:1px solid var(--border);border-radius:24px;padding:14px;box-shadow:var(--shadow);z-index:55}.main-nav.is-open{display:grid}.main-nav a{padding:14px 16px}.menu-toggle{display:flex}.nav-actions{margin-left:auto}.hero-grid,.split-panel{grid-template-columns:1fr}.dashboard-grid{grid-template-columns:repeat(3,1fr)}}
@media (max-width:768px){.container{width:min(100% - 24px,var(--max))}.nav-shell{min-height:70px}.brand{font-size:1.15rem}.brand-mark{width:38px;height:38px;border-radius:14px}.nav-actions{display:none}.hero{padding:44px 0 32px}.hero-copy h1,.page-hero h1{letter-spacing:-.055em}.button-row,.card-actions{flex-direction:column}.btn{width:100%;min-height:52px}.grade-band-grid,.subject-grid,.card-grid.three,.grade-card-grid,.lesson-grid,.dashboard-grid,.answer-grid{grid-template-columns:1fr}.grade-pills{grid-template-columns:1fr}.section{padding:44px 0}.split-panel,.mustafa-box{grid-template-columns:1fr;padding:22px}.choice-preview{grid-template-columns:repeat(2,1fr)}.footer-grid{display:grid}.footer-links{display:grid;grid-template-columns:1fr}.quiz-wrap,.form-card{padding:20px}.menu-toggle{width:46px;height:46px}}