:root {
      --bg: #07130e; --bg-surface: #0c1c15; --bg-card: rgba(15, 33, 26, 0.94);
      --card-gradient: linear-gradient(135deg, rgba(16, 36, 29, 0.96) 0%, rgba(9, 23, 18, 0.98) 100%);
      --surface-border: rgba(47, 211, 154, 0.22); --border-subtle: rgba(255, 255, 255, 0.08);
      --gold: #f59e0b; --gold-light: #fbbf24; --indigo: #00a878; --indigo-light: #7ee6c0;
      --emerald: #10b981; --emerald-light: #34d399; --cyan: #22d3ee;
      --text-primary: #f0f7f4; --text-secondary: #a5c0b6; --text-muted: #74938a;
      --radius-lg: 16px; --radius-md: 12px;
      --font: 'Assistant', 'Inter', -apple-system, sans-serif; --mono: 'JetBrains Mono', monospace;
    }
    *, *::before, *::after { box-sizing: border-box; max-width: 100%; }
    body { background-color: var(--bg); color: var(--text-primary); font-family: var(--font); line-height: 1.7; margin: 0; min-height: 100vh; overflow-x: hidden; font-variant-numeric: tabular-nums; }
    .site-header { position: sticky; top: 0; z-index: 100; background: rgba(10, 24, 19, 0.95); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(47, 211, 154, 0.16); padding: 12px 20px; }
    .header-inner { max-width: 1120px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
    .brand-logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.15rem; color: #fff; text-decoration: none; }
    .brand-logo .accent { color: var(--gold); }
    .nav-links { display: flex; align-items: center; gap: 14px; }
    .nav-link { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; font-weight: 600; }
    .nav-link:hover { color: #fff; }
    .lang-btn { background: rgba(47, 211, 154, 0.14); border: 1px solid rgba(47, 211, 154, 0.35); color: #7ee6c0; font-weight: 700; font-size: 0.82rem; padding: 4px 10px; border-radius: 6px; text-decoration: none; }
    .btn-launch-os { background: linear-gradient(135deg, var(--gold), #d97706); color: #000; font-weight: 800; font-size: 0.85rem; padding: 8px 16px; border-radius: 30px; text-decoration: none; display: inline-flex; align-items: center; min-height: 44px; }
    
    .main-container { max-width: 1000px; margin: 0 auto; padding: 36px 20px 80px; }
    .hero { text-align: center; margin-bottom: 40px; }
    .badge-kicker { display: inline-flex; background: rgba(47, 211, 154, 0.14); border: 1px solid rgba(47, 211, 154, 0.35); color: #7ee6c0; font-size: 0.8rem; font-weight: 700; padding: 4px 14px; border-radius: 20px; margin-bottom: 14px; }
    h1 { font-size: clamp(1.85rem, 4vw, 2.6rem); font-weight: 900; line-height: 1.25; margin-bottom: 14px; }
    .lead-p { font-size: 1.1rem; color: var(--text-secondary); max-width: 800px; margin: 0 auto 24px; }

    /* Module Navigation Tabs */
    .toolkit-tabs { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 34px; }
    .tool-tab { background: rgba(255,255,255,0.05); border: 1px solid var(--border-subtle); color: var(--text-secondary); font-family: inherit; font-size: 0.88rem; font-weight: 700; padding: 9px 18px; border-radius: 20px; cursor: pointer; transition: all 0.15s; }
    .tool-tab:hover { color: #fff; border-color: var(--indigo-light); }
    .tool-tab.active { background: linear-gradient(135deg, #00a878, #2fd39a); border-color: #2fd39a; color: #fff; }

    /* Card Panels */
    .module-card { background: var(--card-gradient); border: 1.5px solid var(--surface-border); box-shadow: 0 16px 40px rgba(0,0,0,0.5); border-radius: var(--radius-lg); padding: 30px; margin-bottom: 30px; scroll-margin-top: 80px; }
    .module-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; border-bottom: 1px solid rgba(47, 211, 154, 0.16); padding-bottom: 16px; }
    .module-title h2 { font-size: 1.45rem; font-weight: 900; color: #fff; margin: 0 0 4px; }
    .module-source { font-size: 0.85rem; color: var(--gold-light); font-weight: 700; }
    
    /* Interactive calculator form */
    .calc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 20px; }
    .calc-field label { display: block; font-size: 0.84rem; font-weight: 700; color: var(--text-secondary); margin-bottom: 6px; }
    .calc-field input, .calc-field select { width: 100%; background: rgba(0,0,0,0.35); border: 1.5px solid var(--surface-border); border-radius: 10px; padding: 10px 14px; font-family: var(--mono); color: #fff; font-size: 1rem; outline: none; }
    .calc-field input:focus, .calc-field select:focus { border-color: var(--gold); }
    
    /* Result Box */
    .res-box { background: rgba(16,185,129,0.08); border: 1.5px solid rgba(16,185,129,0.3); border-radius: 12px; padding: 20px; margin: 20px 0; }
    .res-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; }
    .res-item span { display: block; font-size: 0.78rem; text-transform: uppercase; color: var(--emerald-light); font-weight: 700; margin-bottom: 4px; }
    .res-item b { font-family: var(--mono); font-size: 1.5rem; color: #fff; font-weight: 900; }
    .res-desc { margin-top: 14px; font-size: 0.92rem; color: var(--text-secondary); line-height: 1.6; }

    /* Tables */
    .styled-table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 0.9rem; }
    .styled-table th { background: rgba(255,255,255,0.06); padding: 12px 14px; text-align: right; color: var(--text-primary); font-weight: 800; border-bottom: 2px solid var(--surface-border); }
    .styled-table td { padding: 12px 14px; border-bottom: 1px solid rgba(47, 211, 154, 0.16); color: var(--text-secondary); }
    .styled-table tr:hover td { background: rgba(255,255,255,0.02); color: #fff; }
    .styled-table b { color: #fff; font-family: var(--mono); }
    .badge { display: inline-block; padding: 3px 10px; border-radius: 10px; font-size: 0.75rem; font-weight: 800; }
    .badge.green { background: rgba(16,185,129,0.2); color: var(--emerald-light); }
    .badge.gold { background: rgba(245,158,11,0.2); color: var(--gold-light); }
    .badge.indigo { background: rgba(99,102,241,0.2); color: var(--indigo-light); }

    .site-footer { border-top: 1px solid var(--border-subtle); padding: 40px 20px; font-size: 0.85rem; color: var(--text-muted); text-align: center; background: var(--bg-surface); }