:root{--sn-deep-forest:#1A2E35;--sn-forest-green:#2A7A32;--sn-alpine-green:#4FC35A;--sn-bg-light:#F5F5F5;--sn-bg-off:#FAFAFA;--sn-text:#2C3E41;--sn-text-muted:#5A6E72;--sn-white:#FFFFFF;--sn-border:#E4EBEC}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:'Georgia','Times New Roman',serif;color:var(--sn-text);background:var(--sn-white);overflow-x:hidden}.sidebar{position:fixed;top:0;left:0;width:72px;height:100vh;background:var(--sn-deep-forest);display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:32px 0;z-index:100}.sidebar-logo{writing-mode:vertical-rl;transform:rotate(180deg);font-size:.75rem;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--sn-white);text-decoration:none}.sidebar-logo span{color:var(--sn-alpine-green)}.sidebar-back{writing-mode:vertical-rl;font-family:'Arial',sans-serif;font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;color:rgb(255 255 255 / .4);text-decoration:none;padding:12px 0;border-top:1px solid rgb(255 255 255 / .1);border-bottom:1px solid rgb(255 255 255 / .1);transition:color 0.2s}.sidebar-back:hover{color:var(--sn-alpine-green)}.top-nav{position:fixed;top:0;left:72px;right:0;z-index:99;display:flex;align-items:center;justify-content:space-between;padding:0 40px;height:52px;background:rgb(255 255 255 / .95);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--sn-border)}.top-nav-brand{display:inline-flex;align-items:center;line-height:1;font-size:.9rem;color:var(--sn-deep-forest);text-decoration:none;letter-spacing:.04em}.top-nav-brand span{color:var(--sn-forest-green)}.top-nav-links{display:flex;align-items:center;gap:6px;list-style:none;margin:0;padding:0;height:100%}.top-nav-links li{display:flex;align-items:center;line-height:1}.top-nav-links 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var(--sn-border);background:var(--sn-bg-light)}.page-header-tag{font-family:'Arial',sans-serif;font-size:.65rem;letter-spacing:.28em;text-transform:uppercase;color:var(--sn-forest-green);margin-bottom:18px}.page-header h1{font-size:clamp(2rem, 4vw, 3.4rem);color:var(--sn-deep-forest);font-weight:400;line-height:1.1;letter-spacing:-.01em;margin-bottom:20px}.page-header-desc{font-family:'Arial',sans-serif;font-size:1rem;color:var(--sn-text-muted);line-height:1.75;max-width:600px}.level-filter{padding:28px 80px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--sn-border);background:var(--sn-white);position:sticky;top:52px;z-index:50}.level-filter-label{font-family:'Arial',sans-serif;font-size:.65rem;letter-spacing:.2em;text-transform:uppercase;color:var(--sn-text-muted);margin-right:4px}.level-btn{display:inline-flex;align-items:center;gap:7px;padding:7px 16px;border:1.5px solid 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