:root{
  --bg:#fffdf7; --panel:#fff6dc; --text:#1f1a12; --muted:#74664a; --divider:#ead9a6;
  --light:#e7be46; --accent:#d4a017; --btnText:#ffffff; --operator:#111111;
  --card: color-mix(in srgb, var(--panel) 78%, white 22%);
  --shadow: 0 24px 70px rgba(20,18,14,.10);
  --radius:24px;
}
[data-theme="gold"][data-mode="dark"]{--bg:#181106;--panel:#231808;--text:#fff7e2;--muted:#d1bb82;--divider:#5c4714;--light:#9d7314;--accent:#e2b63d;--operator:#111111;--shadow:0 24px 70px rgba(0,0,0,.42)}
[data-theme="blue"]{--bg:#f8fbff;--panel:#eaf1ff;--text:#16233c;--muted:#5e7298;--divider:#c8d8f9;--light:#6ea2ff;--accent:#377dff;--operator:#111111}
[data-theme="blue"][data-mode="dark"]{--bg:#07111e;--panel:#0d1b31;--text:#eef5ff;--muted:#abc2e8;--divider:#28446f;--light:#2558b6;--accent:#5a96ff;--operator:#111111;--shadow:0 24px 70px rgba(0,0,0,.45)}
[data-theme="green"]{--bg:#f6fff8;--panel:#e6f8ec;--text:#132217;--muted:#5c7862;--divider:#c9e6d0;--light:#43c976;--accent:#20b15a;--operator:#111111}
[data-theme="green"][data-mode="dark"]{--bg:#07150a;--panel:#0b2112;--text:#ecfff1;--muted:#b1d5b8;--divider:#245230;--light:#1c7d43;--accent:#35c16e;--operator:#111111;--shadow:0 24px 70px rgba(0,0,0,.45)}
[data-theme="red"]{--bg:#fff7f6;--panel:#ffe7e5;--text:#2a1715;--muted:#8a6260;--divider:#f0c8c4;--light:#ee5a4e;--accent:#d92d20;--operator:#111111}
[data-theme="red"][data-mode="dark"]{--bg:#170807;--panel:#240c0b;--text:#fff0ef;--muted:#dbb0ad;--divider:#5e2320;--light:#962a24;--accent:#f04438;--operator:#111111;--shadow:0 24px 70px rgba(0,0,0,.45)}
[data-theme="black"]{--bg:#fafafb;--panel:#eeeef1;--text:#1e1e22;--muted:#666873;--divider:#d3d4da;--light:#7a7b87;--accent:#4b4b55;--operator:#ffffff}
[data-theme="black"][data-mode="dark"]{--bg:#09090a;--panel:#121215;--text:#f4f4f6;--muted:#b0b1ba;--divider:#2d2e35;--light:#303038;--accent:#6e6e77;--operator:#ffffff;--shadow:0 24px 70px rgba(0,0,0,.55)}
[data-theme="orange"]{--bg:#fff7f0;--panel:#fff0e2;--text:#1e1a17;--muted:#6b5746;--divider:#e5cdb9;--light:#f4a261;--accent:#e57a22;--operator:#111111}
[data-theme="orange"][data-mode="dark"]{--bg:#1a0e06;--panel:#251208;--text:#fff0e3;--muted:#dab08a;--divider:#5a3218;--light:#b85f1c;--accent:#f2994a;--operator:#111111;--shadow:0 24px 70px rgba(0,0,0,.45)}
[data-theme="purple"]{--bg:#fbf8ff;--panel:#f2ebff;--text:#1f1830;--muted:#685e87;--divider:#d9cef3;--light:#a78bfa;--accent:#8b5cf6;--operator:#111111}
[data-theme="purple"][data-mode="dark"]{--bg:#120c20;--panel:#1a1230;--text:#f2ecff;--muted:#c4b8e7;--divider:#40305f;--light:#5b3aa8;--accent:#a78bfa;--operator:#111111;--shadow:0 24px 70px rgba(0,0,0,.45)}
[data-theme="teal"]{--bg:#f4fffe;--panel:#e8fbfa;--text:#132323;--muted:#5b7373;--divider:#cbe6e4;--light:#2dd4bf;--accent:#0ea5a4;--operator:#111111}
[data-theme="teal"][data-mode="dark"]{--bg:#061816;--panel:#0c2422;--text:#e8fffc;--muted:#a9d8d4;--divider:#1e5652;--light:#117c77;--accent:#2dd4bf;--operator:#111111;--shadow:0 24px 70px rgba(0,0,0,.45)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,Arial,sans-serif;background:radial-gradient(circle at top right,color-mix(in srgb,var(--accent) 16%,transparent),transparent 35%),var(--bg);color:var(--text);line-height:1.6;transition:background .25s,color .25s}a{color:inherit;text-decoration:none}.wrap{width:min(1160px,92vw);margin:auto}.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid var(--divider)}.nav{height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;font-weight:900;letter-spacing:-.03em}.brand-mark{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--accent),var(--light));display:grid;place-items:center;color:#fff;font-weight:900;box-shadow:0 10px 28px color-mix(in srgb,var(--accent) 35%,transparent)}.nav-links{display:flex;align-items:center;gap:8px}.nav-links a,.mini-btn{padding:10px 14px;border-radius:999px;color:var(--muted);font-weight:800;border:1px solid transparent}.nav-links a.active,.nav-links a:hover,.mini-btn:hover{color:var(--text);background:var(--panel);border-color:var(--divider)}.controls{display:flex;align-items:center;gap:8px}.mode-toggle,.theme-select{border:1px solid var(--divider);background:var(--panel);color:var(--text);border-radius:999px;padding:10px 12px;font-weight:800}.hamb{display:none;border:0;background:var(--panel);color:var(--text);border-radius:12px;padding:10px 12px;font-weight:900}.hero{padding:82px 0 42px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:42px;align-items:center}.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:900;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);background:var(--panel);border:1px solid var(--divider);border-radius:999px;padding:8px 12px}.h1{font-size:clamp(42px,6vw,78px);line-height:.96;margin:18px 0 18px;letter-spacing:-.06em}.lead{font-size:20px;color:var(--muted);max-width:650px}.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:16px;padding:14px 18px;font-weight:900;cursor:pointer;transition:.2s transform,.2s box-shadow}.btn:hover{transform:translateY(-2px)}.btn.primary{background:var(--accent);color:var(--btnText);box-shadow:0 14px 34px color-mix(in srgb,var(--accent) 30%,transparent)}.btn.secondary{background:var(--panel);color:var(--text);border:1px solid var(--divider)}.section{padding:54px 0}.section-head{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:22px}.section-head h2{font-size:clamp(28px,4vw,46px);line-height:1;margin:0;letter-spacing:-.04em}.section-head p{margin:0;color:var(--muted);max-width:560px}.grid{display:grid;gap:18px}.grid.three{grid-template-columns:repeat(3,1fr)}.grid.two{grid-template-columns:repeat(2,1fr)}.card{background:linear-gradient(180deg,color-mix(in srgb,var(--card) 95%,white 5%),var(--card));border:1px solid var(--divider);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.card h3{margin:0 0 8px;font-size:23px;letter-spacing:-.03em}.card p{margin:0;color:var(--muted)}.fade-card{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}.fade-card.visible{opacity:1;transform:translateY(0)}.pill-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.pill{background:var(--panel);border:1px solid var(--divider);border-radius:999px;padding:9px 12px;color:var(--muted);font-weight:800}.phone-shell{max-width:420px;margin:auto;border-radius:42px;padding:14px;background:linear-gradient(145deg,color-mix(in srgb,var(--text) 12%,var(--panel)),var(--panel));box-shadow:var(--shadow);border:1px solid var(--divider)}.app-preview{border-radius:32px;background:var(--bg);min-height:620px;padding:18px;display:flex;flex-direction:column;gap:14px;border:1px solid var(--divider)}.preview-top{display:flex;justify-content:space-between;align-items:center}.preview-title{font-weight:900;font-size:20px}.preview-display{min-height:130px;border-radius:24px;background:var(--panel);padding:18px;display:flex;flex-direction:column;align-items:flex-end;justify-content:flex-end;border:1px solid var(--divider)}.preview-expression{color:var(--muted);font-size:18px}.preview-result{font-size:42px;font-weight:900;letter-spacing:-.05em}.preview-keys{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.key{aspect-ratio:1/1;border-radius:20px;border:1px solid var(--divider);background:color-mix(in srgb,var(--light) 26%,var(--panel));display:grid;place-items:center;font-weight:900}.key.op{background:var(--accent);color:var(--btnText)}.key.dark{background:color-mix(in srgb,var(--accent) 78%,#000 22%);color:#fff}.theme-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.theme-card{border:1px solid var(--divider);background:var(--card);border-radius:22px;padding:18px;cursor:pointer}.theme-card.active{outline:3px solid var(--accent)}.swatches{display:flex;gap:7px;margin:14px 0}.swatches span{height:30px;flex:1;border-radius:999px;border:1px solid rgba(0,0,0,.08)}.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:center}.mock-list{display:grid;gap:12px}.mock-item{display:flex;justify-content:space-between;gap:12px;background:var(--panel);border:1px solid var(--divider);padding:16px;border-radius:18px}.mock-item strong{display:block}.mock-item span{color:var(--muted);font-size:14px}.calc-area{padding-bottom:80px}.calc-app{max-width:480px;margin:0 auto;background:var(--card);border:1px solid var(--divider);border-radius:34px;padding:18px;box-shadow:var(--shadow)}.calc-screen{min-height:150px;background:var(--bg);border:1px solid var(--divider);border-radius:26px;padding:18px;margin-bottom:14px;text-align:right;display:flex;flex-direction:column;justify-content:flex-end;overflow:hidden}.calc-expression{min-height:26px;color:var(--muted);font-weight:800;word-break:break-all}.calc-result{font-size:42px;font-weight:950;line-height:1.1;letter-spacing:-.05em;word-break:break-all}.calc-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.calc-buttons button{border:1px solid var(--divider);background:color-mix(in srgb,var(--light) 18%,var(--panel));color:var(--text);border-radius:18px;min-height:62px;font-size:20px;font-weight:900;cursor:pointer}.calc-buttons button:hover{filter:brightness(.98)}.calc-buttons .operator,.calc-buttons .equals{background:var(--accent);color:var(--btnText)}.calc-buttons .wide{grid-column:span 2}.calc-actions{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}.saved-toolbar{display:flex;gap:12px;margin-bottom:18px;flex-wrap:wrap}.input{border:1px solid var(--divider);background:var(--panel);color:var(--text);border-radius:16px;padding:14px 15px;font-weight:800;min-width:260px;flex:1}.saved-list{display:grid;gap:14px}.saved-card{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--card);border:1px solid var(--divider);border-radius:22px;padding:18px}.saved-card h3{margin:0;font-size:18px}.saved-card p{margin:4px 0 0;color:var(--muted)}.legal{max-width:900px;margin:auto}.legal h1{font-size:46px;letter-spacing:-.05em}.legal h2{margin-top:30px}.footer{border-top:1px solid var(--divider);padding:34px 0;background:color-mix(in srgb,var(--panel) 48%,transparent)}.footer-grid{display:flex;justify-content:space-between;gap:20px;align-items:center;flex-wrap:wrap}.footer-links{display:flex;gap:10px;flex-wrap:wrap}.footer-links a{background:var(--bg);border:1px solid var(--divider);border-radius:999px;padding:10px 13px;color:var(--muted);font-weight:800}.project-form{display:grid;gap:12px}.textarea{min-height:130px;resize:vertical}.notice{border:1px dashed var(--divider);background:var(--panel);border-radius:20px;padding:16px;color:var(--muted)}
@media(max-width:900px){.hero-grid,.feature-row,.grid.two{grid-template-columns:1fr}.grid.three,.theme-cards{grid-template-columns:repeat(2,1fr)}.nav-links{display:none;position:absolute;top:76px;left:4vw;right:4vw;flex-direction:column;align-items:stretch;background:var(--bg);border:1px solid var(--divider);border-radius:20px;padding:12px;box-shadow:var(--shadow)}.nav-links.open{display:flex}.hamb{display:block}.controls{gap:6px}.theme-select{max-width:110px}.section-head{display:block}.section-head p{margin-top:10px}.app-preview{min-height:560px}}
@media(max-width:540px){.grid.three,.theme-cards{grid-template-columns:1fr}.h1{font-size:44px}.nav{height:72px}.brand span:last-child{display:none}.calc-buttons button{min-height:54px}.saved-card{align-items:flex-start;flex-direction:column}.footer-grid{display:block}.footer-links{margin-top:16px}.hero{padding-top:46px}}