:root{
  --bg:#f8f9fb; --card:#ffffff; --ink:#111827; --muted:#6b7280; --faint:#9ca3af;
  --line:#eef0f4; --line-2:#e5e7eb;
  --amber:#fbbf24; --amber-d:#f59e0b; --amber-soft:#fffbeb;
  --green:#10b981; --red:#ef4444; --blue:#3b82f6;
  --shadow:0 10px 30px rgba(17,24,39,.06); --shadow-lg:0 24px 60px rgba(17,24,39,.10);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:'Assistant',system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;font-weight:700;
  -webkit-font-smoothing:antialiased;min-height:100dvh;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
::selection{background:var(--amber);color:#111827}

/* brand */
.brand{display:flex;align-items:center;gap:11px;font-weight:900}
.brand .logo{width:40px;height:40px;border-radius:13px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--amber),var(--amber-d));color:#fff;font-size:20px;
  box-shadow:0 8px 20px rgba(245,158,11,.35)}
.brand .logo svg{width:22px;height:22px;stroke:#fff;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.brand .name{font-size:19px;line-height:1;letter-spacing:-.02em}
.brand .sub{font-size:9.5px;letter-spacing:2px;color:var(--faint);font-weight:800;margin-top:2px}

/* top bar */
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:16px clamp(18px,5vw,48px);background:rgba(248,249,251,.86);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.topbar .actions{display:flex;align-items:center;gap:10px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;border-radius:14px;
  font-weight:800;font-size:15px;border:1px solid transparent;transition:transform .15s ease,box-shadow .15s ease,background .15s ease,filter .15s ease;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--ink);color:#fff;box-shadow:0 10px 24px rgba(17,24,39,.16)}
.btn-primary:hover{transform:translateY(-2px);filter:brightness(1.08)}
.btn-amber{background:linear-gradient(135deg,var(--amber),var(--amber-d));color:#111827;box-shadow:0 10px 24px rgba(245,158,11,.32)}
.btn-amber:hover{transform:translateY(-2px)}
.btn-ghost{background:#fff;border-color:var(--line-2);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink)}
.btn-block{width:100%}
.btn-lg{padding:16px 30px;font-size:16.5px;border-radius:16px}

/* card / auth shell */
.auth-wrap{min-height:100dvh;display:grid;place-items:center;padding:32px 18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow-lg)}
.auth-card{width:100%;max-width:440px;padding:clamp(26px,5vw,40px)}
.auth-head{text-align:center;margin-bottom:26px}
.auth-head .brand{justify-content:center;margin-bottom:18px}
.auth-head h1{font-size:27px;font-weight:900;letter-spacing:-.02em}
.auth-head p{color:var(--muted);font-weight:700;margin-top:6px;font-size:14.5px}

/* form */
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:800;color:var(--muted);margin-bottom:7px}
.field input{width:100%;padding:14px 16px;border-radius:14px;border:1.5px solid var(--line-2);background:#fbfbfd;
  font-family:inherit;font-size:15.5px;font-weight:700;color:var(--ink);transition:border-color .15s,box-shadow .15s}
.field input:focus{outline:none;border-color:var(--amber-d);box-shadow:0 0 0 4px rgba(251,191,36,.18);background:#fff}
.field input::placeholder{color:var(--faint);font-weight:600}
.code-input{text-align:center;font-family:ui-monospace,Menlo,monospace;font-size:30px;letter-spacing:12px;direction:ltr;font-weight:800}
.hint{font-size:13px;color:var(--faint);font-weight:700;text-align:center;margin-top:16px}
.hint a{color:var(--ink);font-weight:800}
.msg{margin-top:14px;padding:12px 16px;border-radius:12px;font-weight:800;font-size:14px;text-align:center;display:none}
.msg.err{display:block;background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}
.msg.ok{display:block;background:#ecfdf5;color:#047857;border:1px solid #a7f3d0}

/* verified badge */
.done-badge{width:76px;height:76px;border-radius:50%;background:linear-gradient(135deg,var(--green),#059669);
  display:grid;place-items:center;margin:0 auto 18px;box-shadow:0 14px 30px rgba(16,185,129,.35)}
.done-badge svg{width:38px;height:38px;stroke:#fff;fill:none;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}

/* dashboard */
.shell{max-width:900px;margin:0 auto;padding:clamp(20px,4vw,40px) clamp(18px,5vw,40px) 80px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0 26px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:20px 22px;box-shadow:var(--shadow)}
.stat .n{font-size:34px;font-weight:900;letter-spacing:-.03em;line-height:1}
.stat .l{font-size:13px;font-weight:800;color:var(--muted);margin-top:4px}
.stat.open .n{color:var(--amber-d)} .stat.done .n{color:var(--green)}
.add-row{display:flex;gap:10px;margin-bottom:20px}
.add-row input{flex:1;padding:15px 18px;border-radius:16px;border:1.5px solid var(--line-2);background:#fff;
  font-family:inherit;font-size:16px;font-weight:700;box-shadow:var(--shadow)}
.add-row input:focus{outline:none;border-color:var(--amber-d);box-shadow:0 0 0 4px rgba(251,191,36,.18)}
.task-list{display:flex;flex-direction:column;gap:11px}
.task{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);
  border-radius:18px;padding:15px 18px;box-shadow:var(--shadow);transition:opacity .2s,transform .15s}
.task:hover{transform:translateY(-1px)}
.task .check{width:26px;height:26px;border-radius:9px;border:2px solid var(--line-2);flex-shrink:0;
  display:grid;place-items:center;cursor:pointer;transition:.15s}
.task .check svg{width:15px;height:15px;stroke:#fff;fill:none;stroke-width:3.4;stroke-linecap:round;stroke-linejoin:round;opacity:0}
.task.done .check{background:var(--green);border-color:var(--green)}
.task.done .check svg{opacity:1}
.task .title{flex:1;font-weight:800;font-size:16px}
.task.done .title{text-decoration:line-through;color:var(--faint)}
.task .pri{font-size:11px;font-weight:900;padding:4px 10px;border-radius:8px}
.pri.high{background:#fef2f2;color:#dc2626} .pri.medium{background:#fffbeb;color:#b45309} .pri.low{background:#eff6ff;color:#2563eb}
.task .del{width:32px;height:32px;border-radius:9px;border:0;background:transparent;color:var(--faint);display:grid;place-items:center;transition:.15s}
.task .del:hover{background:#fef2f2;color:var(--red)}
.task .del svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.empty{text-align:center;padding:50px 20px;color:var(--faint);font-weight:800}
.empty .em{font-size:44px;margin-bottom:10px}

/* landing */
.hero{max-width:980px;margin:0 auto;padding:clamp(40px,9vw,90px) clamp(20px,5vw,40px) 40px;text-align:center}
.pill{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:99px;background:var(--amber-soft);
  border:1px solid #fde68a;color:#b45309;font-weight:800;font-size:13.5px;margin-bottom:24px}
.hero h1{font-size:clamp(38px,7vw,66px);font-weight:900;letter-spacing:-.035em;line-height:1.03}
.hero h1 .hl{background:linear-gradient(120deg,var(--amber-d),var(--amber));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:clamp(16px,2.3vw,20px);color:var(--muted);font-weight:700;max-width:560px;margin:22px auto 0}
.hero .cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.feat{max-width:980px;margin:20px auto 0;padding:0 clamp(20px,5vw,40px);display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.feat .f{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:26px 24px;box-shadow:var(--shadow);text-align:right}
.feat .f .ic{width:48px;height:48px;border-radius:14px;background:var(--amber-soft);display:grid;place-items:center;margin-bottom:14px}
.feat .f .ic svg{width:24px;height:24px;stroke:var(--amber-d);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.feat .f h3{font-size:18px;font-weight:900;margin-bottom:5px}
.feat .f p{color:var(--muted);font-weight:700;font-size:14.5px}

/* pricing / upgrade */
.plans{max-width:1000px;margin:0 auto;padding:clamp(28px,5vw,44px) clamp(18px,5vw,40px) 60px}
.plans-head{text-align:center;margin-bottom:34px}
.plans-head h1{font-size:clamp(30px,5vw,46px);font-weight:900;letter-spacing:-.03em}
.plans-head p{color:var(--muted);font-weight:700;margin-top:8px}
.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:stretch}
.plan{background:var(--card);border:1.5px solid var(--line);border-radius:26px;padding:30px 26px;box-shadow:var(--shadow);display:flex;flex-direction:column}
.plan.pop{border-color:var(--amber-d);box-shadow:0 24px 60px rgba(245,158,11,.18);position:relative}
.plan.pop .tag{position:absolute;top:-13px;right:26px;background:linear-gradient(135deg,var(--amber),var(--amber-d));
  color:#111827;font-size:12px;font-weight:900;padding:5px 14px;border-radius:99px;box-shadow:0 8px 18px rgba(245,158,11,.35)}
.plan .pname{font-size:17px;font-weight:900;color:var(--muted)}
.plan .price{font-size:44px;font-weight:900;letter-spacing:-.03em;margin:8px 0 2px}
.plan .price small{font-size:16px;color:var(--faint);font-weight:800}
.plan ul{list-style:none;margin:20px 0 24px;display:flex;flex-direction:column;gap:11px}
.plan li{display:flex;align-items:center;gap:10px;font-weight:700;color:#374151;font-size:14.5px}
.plan li svg{width:18px;height:18px;stroke:var(--green);fill:none;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
.plan .btn{margin-top:auto}
.plan.sel{border-color:var(--ink);box-shadow:0 20px 50px rgba(17,24,39,.14)}
.btn-dark{background:var(--ink);color:#fff;box-shadow:0 10px 24px rgba(17,24,39,.16)}
.btn-dark:hover{transform:translateY(-2px);filter:brightness(1.12)}
.summary{max-width:1000px;margin:6px auto 0;padding:0 clamp(18px,5vw,40px)}
.summary .box{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:24px 26px;box-shadow:var(--shadow);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.summary .row{display:flex;flex-direction:column}
.summary .row .k{font-size:13px;color:var(--muted);font-weight:800}
.summary .row .v{font-size:22px;font-weight:900}
.summary .row .v small{font-size:14px;color:var(--faint)}

@media(max-width:760px){
  .stats,.feat,.plan-grid{grid-template-columns:1fr}
  .hero .cta{flex-direction:column}
  .plan.pop{order:-1}
}