:root{--bg: #f5f7fa;--panel: #ffffff;--soft: #f8fafc;--tile: #f8fafc;--border: #e0e5ec;--text: #1f2937;--muted: #6b7280;--accent: #0f766e;--accent-hover: #0d5e56;--accent-text: #ffffff;--selection: #d1ece8;--disabled-bg: #edeff3;--disabled-fg: #9ca3af;--header-bg: rgba(255, 255, 255, .92);--header-bg-scrolled: rgba(255, 255, 255, .97);--header-shadow: 0 6px 20px rgba(31, 41, 55, .06);--stage-glow: rgba(36, 136, 148, .4);--stage-glow-soft: rgba(36, 136, 148, .18);--stage-glow-fade: rgba(36, 136, 148, 0);--stage-wash: rgba(36, 136, 148, .15);--frame-hairline: rgba(15, 23, 42, .1);--frame-shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 12px 28px -8px rgba(15, 23, 42, .14), 0 30px 60px -22px rgba(15, 23, 42, .13);--container: 1360px;--radius: 16px;--shadow:0 1px 2px rgba(31, 41, 55, .04), 0 8px 24px rgba(31, 41, 55, .06);--fs-eyebrow: .8rem;--fs-page-title: clamp(1.9rem, 3.2vw, 2.6rem);--fs-article-title: clamp(1.7rem, 3vw, 2.2rem);--fs-page-lead: 1.1rem;--fs-section-title: clamp(1.35rem, 1.8vw, 1.5rem);--fs-subsection-title: 1.3rem;--fs-card-title: 1.05rem;--fs-body: .95rem;--fs-support: .9rem;--fs-meta: .82rem;--hero-pad: 80px;--hero-pad-compact: 64px;--section-gap: 72px;--section-gap-mid: 60px;--intro-gap: 28px;--flow-gap: 40px;--card-pad: 24px;--grid-gap: 20px;--cta-gap: 12px}:root[data-theme=dark]{--bg: #1f2328;--panel: #282d34;--soft: #22272e;--tile: #22262d;--border: #3a414b;--text: #e5e7eb;--muted: #a7aeba;--accent: #14b8a6;--accent-hover: #2dd4bf;--accent-text: #0a1c1a;--selection: #24443e;--disabled-bg: #2e333a;--disabled-fg: #646b76;--header-bg: rgba(40, 45, 52, .92);--header-bg-scrolled: rgba(40, 45, 52, .97);--header-shadow: 0 6px 20px rgba(0, 0, 0, .28);--stage-glow: rgba(45, 205, 200, .28);--stage-glow-soft: rgba(45, 205, 200, .12);--stage-glow-fade: rgba(45, 205, 200, 0);--stage-wash: rgba(45, 205, 200, .1);--frame-hairline: rgba(255, 255, 255, .1);--frame-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 28px -8px rgba(0, 0, 0, .5), 0 30px 60px -22px rgba(0, 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a{text-decoration:none;color:var(--muted);font-size:1rem;font-weight:500}.site-nav a:hover{color:var(--text)}.header-right{display:flex;align-items:center;gap:22px}.theme-toggle{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:999px;border:1px solid var(--border);background:var(--soft);color:var(--muted);font:inherit;font-size:.85rem;font-weight:600;cursor:pointer;transition:color .15s ease,border-color .15s ease,background .15s ease}.theme-toggle:hover{color:var(--text);border-color:var(--muted)}.nav-toggle{display:none;align-items:center;justify-content:center;width:44px;height:44px;margin-right:-8px;padding:0;border:1px solid var(--border);border-radius:10px;background:var(--soft);color:var(--text);cursor:pointer}.nav-toggle-bars{display:block;position:relative;width:18px;height:12px}.nav-toggle-bars span{position:absolute;left:0;width:100%;height:2px;border-radius:2px;background:currentColor;transition:transform .14s ease,opacity .14s 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