:root{--bg:#f6f7f9;--surface:#ffffff;--ink:#17202a;--muted:#5f6c7b;--line:#dce2ea;--accent:#0f766e;--accent-strong:#0b5f59;--accent-fg:#ffffff;--warn:#b45309;--disabled-bg:#edf1f5;--notice-bg:#fff7ed;--notice-text:#7c2d12;--notice-success-bg:#ecfdf5;--demo-gradient-1:#243b53;--demo-gradient-2:#627d98}.dark{--bg:#0a0a0a;--surface:#171717;--ink:#fafafa;--muted:#a3a3a3;--line:#262626;--accent:#2dd4bf;--accent-strong:#14b8a6;--accent-fg:#0a0a0a;--warn:#f59e0b;--disabled-bg:#262626;--notice-bg:#451a03;--notice-text:#fef3c7;--notice-success-bg:#052e16;--demo-gradient-1:#1e3a5f;--demo-gradient-2:#4a6fa5}.dark-pure{--bg:#000000;--surface:#0a0a0a;--ink:#ffffff;--muted:#a3a3a3;--line:#1a1a1a;--accent:#2dd4bf;--accent-strong:#14b8a6;--accent-fg:#0a0a0a;--warn:#f59e0b;--disabled-bg:#1a1a1a;--notice-bg:#451a03;--notice-text:#fef3c7;--notice-success-bg:#052e16;--demo-gradient-1:#1e3a5f;--demo-gradient-2:#4a6fa5}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Helvetica,sans-serif}body>main{min-height:calc(100vh - 144px)}a{color:inherit;text-decoration:none}.footer,.topbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:16px 32px;border-bottom:1px solid var(--line);background:var(--surface)}.footer{border-top:1px solid var(--line);border-bottom:0;color:var(--muted)}.brand{font-weight:700}.footer,.footer-links,nav{flex-wrap:wrap}.actions,.footer-links,.plan-actions,nav{display:flex;gap:14px}.page{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:48px 0}.page-stack{display:grid;grid-gap:20px;gap:20px}.hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(320px,440px);grid-gap:32px;gap:32px;align-items:center}h1{font-size:48px;line-height:1.05;margin:0 0 18px}h2{font-size:28px;margin:0 0 16px}h3{font-size:20px;margin:0 0 12px}p{color:var(--muted);line-height:1.7;margin:0}.button{display:inline-flex;min-height:40px;align-items:center;justify-content:center;border:1px solid var(--accent);border-radius:6px;background:var(--accent);color:var(--accent-fg);padding:0 14px;font-weight:700}.button.secondary{background:transparent;color:var(--accent)}.button:disabled{cursor:not-allowed;border-color:var(--line);background:var(--disabled-bg);color:var(--muted)}.panel,.plan{border:1px solid var(--line);border-radius:8px;background:var(--surface);padding:20px}.panel{display:grid;grid-gap:12px;gap:12px}.demo-image{position:relative;min-height:280px;overflow:hidden;background:linear-gradient(135deg,rgba(15,118,110,.18),transparent 40%),linear-gradient(45deg,var(--demo-gradient-1),var(--demo-gradient-2))}.demo-caption{position:absolute;left:20px;right:20px;bottom:20px;border-radius:6px;background:rgba(255,255,255,.92);padding:14px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:16px;gap:16px;margin-top:28px}.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}.plans{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:16px;gap:16px}.price{color:var(--ink);font-size:30px;font-weight:700}.notice{border-left:4px solid var(--warn);background:var(--notice-bg);padding:14px;color:var(--notice-text)}.notice.success{border-left-color:var(--accent);background:var(--notice-success-bg);color:var(--accent-strong)}.text-link{color:var(--accent-strong);text-decoration:underline;text-underline-offset:2px}.dense-list{margin:0;padding-left:18px;color:var(--muted);line-height:1.7}input,textarea{width:100%;border:1px solid var(--line);border-radius:6px;padding:10px 12px;font:inherit}.form-stack{align-content:start;gap:14px}.form-stack label{display:grid;grid-gap:6px;gap:6px;color:var(--muted);line-height:1.4}.theme-toggle-wrapper{position:relative}.theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--line);border-radius:6px;background:var(--surface);cursor:pointer;font-size:18px;transition:background-color .2s,border-color .2s}.theme-toggle:hover{background:var(--bg);border-color:var(--accent)}.theme-toggle:disabled{cursor:not-allowed;opacity:.5}@media (max-width:820px){.grid,.grid-two,.hero,.plans{grid-template-columns:1fr}h1{font-size:36px}.footer,.topbar{align-items:flex-start;flex-direction:column;padding:14px 16px}}