:root {
    --ground: #EFF4F3;
    --ground-2: #E5EEEC;
    --panel: #FFFFFF;
    --ink: #0E2A38;
    --ink-soft: #45606B;
    --ink-faint: #7C949C;
    --line: #D5E1DE;
    --line-soft: #E4ECEA;
    --teal: #0E9E8E;
    --teal-bright: #14B7A4;
    --deep: #0B3B4A;
    --mint: #63D3BF;
    --green: #3FB98C;
    --shadow: 0 2px 4px rgba(11,59,74,.05), 0 18px 40px -20px rgba(11,59,74,.22);
    --shadow-sm: 0 1px 2px rgba(11,59,74,.06), 0 6px 16px -10px rgba(11,59,74,.16);

    --rounded: ui-rounded, "SF Pro Rounded", -apple-system, system-ui, "Segoe UI", Roboto, sans-serif;
    --sans: -apple-system, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
    --maxw: 1080px;
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --ground: #071619; --ground-2: #0B2126; --panel: #0F262C;
      --ink: #E7F1EF; --ink-soft: #A0B6B8; --ink-faint: #6A8286;
      --line: #21393F; --line-soft: #193036;
      --teal: #22BFAC; --teal-bright: #35D3BF; --deep: #8CE6D7; --mint: #4FC3AF; --green: #46C08F;
      --shadow: 0 2px 4px rgba(0,0,0,.3), 0 22px 50px -24px rgba(0,0,0,.7);
      --shadow-sm: 0 1px 2px rgba(0,0,0,.35), 0 8px 20px -12px rgba(0,0,0,.6);
    }
  }
  :root[data-theme="light"] {
    --ground: #EFF4F3; --ground-2: #E5EEEC; --panel: #FFFFFF;
    --ink: #0E2A38; --ink-soft: #45606B; --ink-faint: #7C949C;
    --line: #D5E1DE; --line-soft: #E4ECEA;
    --teal: #0E9E8E; --teal-bright: #14B7A4; --deep: #0B3B4A; --mint: #63D3BF; --green: #3FB98C;
    --shadow: 0 2px 4px rgba(11,59,74,.05), 0 18px 40px -20px rgba(11,59,74,.22);
    --shadow-sm: 0 1px 2px rgba(11,59,74,.06), 0 6px 16px -10px rgba(11,59,74,.16);
  }
  :root[data-theme="dark"] {
    --ground: #071619; --ground-2: #0B2126; --panel: #0F262C;
    --ink: #E7F1EF; --ink-soft: #A0B6B8; --ink-faint: #6A8286;
    --line: #21393F; --line-soft: #193036;
    --teal: #22BFAC; --teal-bright: #35D3BF; --deep: #8CE6D7; --mint: #4FC3AF; --green: #46C08F;
    --shadow: 0 2px 4px rgba(0,0,0,.3), 0 22px 50px -24px rgba(0,0,0,.7);
    --shadow-sm: 0 1px 2px rgba(0,0,0,.35), 0 8px 20px -12px rgba(0,0,0,.6);
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
  body {
    margin: 0; background: var(--ground); color: var(--ink);
    font-family: var(--sans); line-height: 1.6; -webkit-font-smoothing: antialiased;
  }
  .wrap { max-width: 100%; margin: 0; padding: 0 clamp(20px, 5vw, 96px); }
  h1, h2, h3 { font-family: var(--rounded); font-weight: 700; line-height: 1.08; margin: 0; text-wrap: balance; letter-spacing: -.02em; }
  p { margin: 0; }
  a { color: var(--teal); text-decoration: none; }
  a:hover { text-decoration: underline; }
  :focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; border-radius: 6px; }

  /* ---------- Nav ---------- */
  nav {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: saturate(1.4) blur(12px);
    background: color-mix(in srgb, var(--ground) 82%, transparent);
    border-bottom: 1px solid var(--line-soft);
  }
  .nav-in { display: flex; align-items: center; gap: 16px; height: 62px; }
  .brand { display: flex; align-items: center; gap: 10px; font-family: var(--rounded); font-weight: 700; font-size: 1.15rem; color: var(--ink); }
  .logo-badge {
    width: 30px; height: 30px; object-fit: contain; display: block;
  }
  .nav-links { margin-left: auto; display: flex; align-items: center; gap: 22px; }
  .nav-links a { color: var(--ink-soft); font-size: .92rem; font-weight: 500; }
  .nav-links a:hover { color: var(--ink); text-decoration: none; }
  .theme-btn {
    background: var(--panel); border: 1px solid var(--line); color: var(--ink-soft);
    width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; cursor: pointer;
  }
  .theme-btn:hover { color: var(--teal); }
  .btn {
    display: inline-flex; align-items: center; gap: 8px; font-family: var(--rounded); font-weight: 600;
    background: var(--ink); color: var(--ground); padding: 10px 18px; border-radius: 11px;
    font-size: .94rem; border: none; cursor: pointer;
  }
  .btn:hover { text-decoration: none; opacity: .92; }
  .btn.teal { background: linear-gradient(140deg, var(--teal-bright), var(--teal)); color: #fff; }
  @media (max-width: 640px) { .nav-links .hide-sm { display: none; } }

  /* ---------- Hero ---------- */
  header.hero { padding: 64px 0 30px; overflow: hidden; }
  .hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; }
  @media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; gap: 30px; } }
  .eyebrow {
    font-family: var(--mono); font-size: .72rem; letter-spacing: .16em; text-transform: uppercase;
    color: var(--teal); font-weight: 600; margin-bottom: 18px;
  }
  .hero h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
  .hero h1 .accent { color: var(--teal); }
  .hero .sub { margin-top: 20px; font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--ink-soft); max-width: 48ch; }
  .hero-cta { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
  .hero-note { margin-top: 16px; font-size: .84rem; color: var(--ink-faint); }
  .fade-up { opacity: 0; transform: translateY(14px); animation: fadeUp .7s cubic-bezier(.2,.7,.3,1) forwards; }
  .fade-up.d1 { animation-delay: .06s; } .fade-up.d2 { animation-delay: .12s; } .fade-up.d3 { animation-delay: .18s; } .fade-up.d4 { animation-delay: .24s; }
  @keyframes fadeUp { to { opacity: 1; transform: none; } }
  @media (prefers-reduced-motion: reduce) { .fade-up { animation: none; opacity: 1; transform: none; } }

  /* ---------- Phone mockup ---------- */
  .phone {
    justify-self: center; width: 300px; max-width: 82vw; aspect-ratio: 300/610;
    background: var(--panel); border-radius: 40px; border: 1px solid var(--line);
    box-shadow: var(--shadow); padding: 14px; position: relative;
  }
  .phone::before { content: ""; position: absolute; top: 15px; left: 50%; transform: translateX(-50%); width: 96px; height: 22px; background: var(--ink); border-radius: 12px; opacity: .9; }
  .screen { height: 100%; border-radius: 28px; background: linear-gradient(180deg, var(--ground), var(--ground-2)); padding: 40px 16px 18px; display: flex; flex-direction: column; gap: 13px; overflow: hidden; }
  .greet { font-family: var(--rounded); font-weight: 700; color: var(--ink); font-size: 1.05rem; }
  .greet span { display: block; font-family: var(--sans); font-weight: 500; font-size: .72rem; color: var(--ink-faint); }
  .habit { display: flex; align-items: center; gap: 10px; background: var(--panel); border: 1px solid var(--line-soft); border-radius: 13px; padding: 10px 12px; box-shadow: var(--shadow-sm); }
  .habit .dot { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; flex: none; }
  .habit .dot.on { background: var(--teal); color: #fff; }
  .habit .dot.off { border: 2px solid var(--line); }
  .habit .dot svg { width: 12px; height: 12px; }
  .habit .t { font-size: .82rem; font-weight: 600; color: var(--ink); }
  .habit .t span { display: block; font-weight: 500; font-size: .66rem; color: var(--ink-faint); }
  .habit .flame { margin-left: auto; font-size: .72rem; color: var(--teal); font-weight: 700; font-family: var(--mono); }
  .mini-graph-card { background: var(--panel); border: 1px solid var(--line-soft); border-radius: 13px; padding: 12px; box-shadow: var(--shadow-sm); margin-top: auto; }
  .mini-graph-card .lbl { font-size: .64rem; color: var(--ink-faint); font-family: var(--mono); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 8px; }
  .heat { display: grid; grid-template-columns: repeat(17, 1fr); gap: 3px; }
  .heat i { aspect-ratio: 1; border-radius: 2.5px; background: var(--cell, var(--line-soft)); }

  /* ---------- Sections ---------- */
  section { padding: 66px 0; border-top: 1px solid var(--line-soft); }
  .sec-head { max-width: 60ch; margin-bottom: 40px; }
  .sec-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
  .sec-head p { margin-top: 14px; color: var(--ink-soft); font-size: 1.05rem; }

  /* ---------- Forgiving section (chart) ---------- */
  .split { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
  @media (max-width: 820px) { .split { grid-template-columns: 1fr; } }
  .chart-card { background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 24px; box-shadow: var(--shadow); }
  .chart-legend { display: flex; gap: 20px; margin-top: 16px; font-size: .82rem; }
  .chart-legend span { display: inline-flex; align-items: center; gap: 7px; color: var(--ink-soft); }
  .swatch { width: 22px; height: 3px; border-radius: 2px; }
  .split h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
  .split .body { margin-top: 16px; color: var(--ink-soft); font-size: 1.05rem; }
  .split .body strong { color: var(--ink); font-weight: 600; }

  /* ---------- Features ---------- */
  .features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
  @media (max-width: 820px) { .features { grid-template-columns: 1fr 1fr; } }
  @media (max-width: 540px) { .features { grid-template-columns: 1fr; } }
  .feat { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 22px; box-shadow: var(--shadow-sm); }
  .feat .ico { width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; background: color-mix(in srgb, var(--teal) 14%, transparent); color: var(--teal); margin-bottom: 14px; }
  .feat .ico svg { width: 20px; height: 20px; }
  .feat h3 { font-size: 1.1rem; }
  .feat p { margin-top: 7px; color: var(--ink-soft); font-size: .93rem; }

  /* ---------- CTA band ---------- */
  .cta-band { background: linear-gradient(140deg, var(--deep), var(--teal)); border-radius: 24px; padding: 48px 40px; text-align: center; color: #fff; box-shadow: var(--shadow); }
  .cta-band h2 { color: #fff; font-size: clamp(1.8rem, 3.6vw, 2.6rem); }
  .cta-band p { color: rgba(255,255,255,.86); margin: 14px auto 26px; max-width: 46ch; }
  .cta-band .btn { background: #fff; color: var(--deep); }
  .cta-actions { display: flex; align-items: center; justify-content: center; gap: 28px; flex-wrap: wrap; }
  .qr-box { display: flex; flex-direction: column; align-items: center; gap: 8px; }
  .qr-box img { border-radius: 12px; background: #fff; padding: 8px; box-shadow: var(--shadow-sm); display: block; }
  .qr-box span { font-size: .8rem; color: rgba(255,255,255,.85); font-family: var(--mono); letter-spacing: .04em; }

  /* ---------- Legal ---------- */
  .legal { max-width: 760px; margin: 0 auto; }
  .back-link { display: inline-flex; align-items: center; gap: 6px; font-family: var(--rounded); font-weight: 600; font-size: .92rem; color: var(--teal); margin-bottom: 22px; }
  .back-link:hover { text-decoration: none; opacity: .8; }
  .legal h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
  .legal .meta { font-family: var(--mono); font-size: .78rem; color: var(--ink-faint); margin-top: 8px; }
  .legal h3 { font-family: var(--rounded); font-size: 1.15rem; margin-top: 34px; color: var(--ink); }
  .legal p, .legal li { color: var(--ink-soft); font-size: .96rem; margin-top: 12px; }
  .legal ul { margin: 6px 0 0; padding-left: 22px; }
  .legal li { margin-top: 8px; }
  .legal strong { color: var(--ink); font-weight: 600; }
  .callout { margin-top: 16px; border-left: 3px solid var(--teal); background: var(--ground-2); border-radius: 0 12px 12px 0; padding: 14px 18px; font-size: .92rem; }

  /* ---------- Footer ---------- */
  footer { border-top: 1px solid var(--line-soft); padding: 46px 0; margin-top: 20px; }
  .foot-top { display: grid; grid-template-columns: 1fr; gap: 20px; }
  @media (min-width: 720px) { .foot-top { grid-template-columns: 1fr auto; align-items: center; } }
  .foot-brand { display: flex; align-items: center; gap: 9px; font-family: var(--rounded); font-weight: 700; font-size: 1rem; color: var(--ink); }
  .foot-tagline { margin: 8px 0 0; font-size: .82rem; color: var(--ink-faint); }
  .foot-tagline a { color: var(--teal); }
  .foot-links { display: flex; gap: 20px; flex-wrap: wrap; }
  .foot-links a { color: var(--ink-soft); font-size: .9rem; font-weight: 500; }
  .foot-links a:hover { color: var(--teal); text-decoration: none; }
  .foot-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line-soft); }
  .foot-bottom p { margin: 0; font-size: .82rem; color: var(--ink-faint); }
  .foot-bottom a { color: var(--ink-faint); }
  .foot-bottom a:hover { color: var(--teal); }