:root{--ib-navy:#0f2a5c;--ib-navy-light:#1a3a6e;--ib-navy-medium:#162d52;--ib-navy-darker:#0b2250;--ib-navy-dark:#162f5e;--ib-accent:#38bdf8;--ib-accent-hover:#0ea5e9;--ib-accent-soft:#bae6fd;--ib-accent-softer:#e0f2fe;--ib-accent-bg:#f0f9ff;--ib-white:#ffffff;--ib-off-white:#fafbfc;--ib-light:#f8fafc;--ib-cream:#fdfcfa;--ib-warm:#faf8f5;--ib-text:#1a1a2e;--ib-text-secondary:#334155;--ib-text-muted:#64748b;--ib-border:#e2e8f0;--ib-star-color:#fbbf24;--ib-course-ai-hl:#6366f1;--ib-course-ai-sl:#10b981;--topic-1:#0284c7;--topic-1-bg:#f0f9ff;--topic-1-border:#38bdf8;--topic-1-chip:#e0f2fe;--topic-2:#047857;--topic-2-bg:#f0fdf4;--topic-2-border:#6ee7b7;--topic-2-chip:#d1fae5;--topic-3:#ea580c;--topic-3-bg:#fff7ed;--topic-3-border:#fb923c;--topic-3-chip:#ffedd5;--topic-4:#db2777;--topic-4-bg:#fdf2f8;--topic-4-border:#f472b6;--topic-4-chip:#fce7f3;--topic-5:#7c3aed;--topic-5-bg:#f5f3ff;--topic-5-border:#a78bfa;--topic-5-chip:#ede9fe;--ib-shadow-xs:0 1px 4px rgba(15, 42, 92, 0.05);--ib-shadow-sm:0 2px 8px rgba(15, 42, 92, 0.06);--ib-shadow-md:0 4px 16px rgba(15, 42, 92, 0.08);--ib-shadow-lg:0 12px 32px rgba(15, 42, 92, 0.12);--ib-shadow-xl:0 24px 48px rgba(15, 42, 92, 0.14);--ib-shadow-btn:0 4px 20px rgba(15, 42, 92, 0.2);--ib-shadow-btn-hover:0 8px 30px rgba(15, 42, 92, 0.25);--ib-shadow-btn-white:0 4px 20px rgba(0, 0, 0, 0.15);--ib-shadow-btn-wh-hover:0 8px 30px rgba(0, 0, 0, 0.2);--ib-shadow-hero-card:0 16px 48px rgba(15, 42, 92, 0.12);--ib-shadow-play:0 6px 24px rgba(0, 0, 0, 0.15);--ib-section-pad:80px;--ib-section-pad-hero:100px 0 120px;--ib-section-pad-cta:100px 0 120px;--ib-section-pad-accent:100px;--ib-section-pad-mobile:72px 0 88px;--ib-space-2:2px;--ib-space-4:4px;--ib-space-6:6px;--ib-space-8:8px;--ib-space-10:10px;--ib-space-12:12px;--ib-space-14:14px;--ib-space-16:16px;--ib-space-20:20px;--ib-space-24:24px;--ib-space-28:28px;--ib-space-32:32px;--ib-space-36:36px;--ib-space-40:40px;--ib-space-48:48px;--ib-space-56:56px;--ib-space-64:64px;--ib-radius-pill:50px;--ib-radius-circle:50%;--ib-radius-xl:24px;--ib-radius-lg:20px;--ib-radius-md:16px;--ib-radius-sm:12px;--ib-radius-xs:8px;--ib-font-size-xs:12px;--ib-font-size-sm:13px;--ib-font-size-base:15px;--ib-font-size-md:16px;--ib-font-size-body:17px;--ib-font-size-lg:18px;--ib-font-size-xl:20px;--ib-font-size-2xl:22px;--ib-font-size-3xl:24px;--ib-container-max:1200px;--ib-container-pad:24px;--ib-content-narrow:680px;--ib-content-medium:800px;--ib-content-wide:960px;--ib-hero-sidebar:380px;--ib-faq-sidebar:320px;--ib-transition:0.3s ease;--ib-transition-fast:0.2s ease}