:root{
  --bg:#f5f7fb; --card:#ffffff; --ink:#0f172a; --muted:#64748b; --line:#e6eaf2;
  --brand:#4f46e5; --brand-2:#06b6d4; --good:#16a34a; --warn:#d97706; --bad:#dc2626;
  --radius:14px; --shadow:0 1px 2px rgba(16,24,40,.04), 0 8px 24px rgba(16,24,40,.06);
  --soft:#eef1f8; --input-bg:#ffffff;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b1020; --card:#141a2e; --ink:#e8edf7; --muted:#94a3b8; --line:#26304a;
    --soft:#1d2740; --input-bg:#0f1626;
    --shadow:0 1px 2px rgba(0,0,0,.3), 0 10px 28px rgba(0,0,0,.45);
  }
}
*{box-sizing:border-box}
html{background:var(--bg)}
body{margin:0;min-height:100vh;font:15px/1.5 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink)}
a{color:var(--brand);text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:24px}
.muted{color:var(--muted)}
.row{display:flex;gap:16px;flex-wrap:wrap}
.spacer{flex:1}

/* buttons + inputs */
button,.btn{appearance:none;border:0;border-radius:10px;background:var(--brand);color:#fff;
  font-weight:600;font-size:14px;padding:10px 16px;cursor:pointer}
button.ghost,.btn.ghost{background:var(--soft);color:var(--ink)}
button:hover{filter:brightness(1.05)}
button:disabled{opacity:.6;cursor:default}
input,textarea,select{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;
  font:inherit;background:var(--input-bg);color:var(--ink)}
label{display:block;font-size:13px;font-weight:600;margin:0 0 6px;color:#334155}
.field{margin-bottom:14px}

/* cards */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:20px}
.card h2{margin:0 0 14px;font-size:16px}

/* badges */
.badge{display:inline-block;font-size:12px;font-weight:700;padding:3px 9px;border-radius:999px}
.badge.demo{background:#fff7ed;color:var(--warn)}
.badge.live{background:#ecfdf5;color:var(--good)}
.pill{font-size:12px;font-weight:700;padding:3px 9px;border-radius:999px;text-transform:capitalize}
.pill.sent{background:#ecfdf5;color:var(--good)}
.pill.pending{background:#eff6ff;color:#2563eb}
.pill.failed{background:#fef2f2;color:var(--bad)}
.pill.opted_out,.pill.skipped{background:#f1f5f9;color:var(--muted)}
.pill.clicked{background:#f5f3ff;color:#7c3aed}

/* landing */
.auth-hero{min-height:100vh;display:grid;grid-template-columns:1.1fr .9fr}
.auth-left{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;padding:56px 48px;display:flex;flex-direction:column;justify-content:center}
.auth-left h1{font-size:38px;line-height:1.1;margin:0 0 16px}
.auth-left p{font-size:17px;opacity:.95;max-width:440px}
.auth-left ul{margin:24px 0 0;padding:0;list-style:none;max-width:440px}
.auth-left li{padding:8px 0 8px 28px;position:relative}
.auth-left li:before{content:"✓";position:absolute;left:0;font-weight:800}
.auth-right{display:flex;align-items:center;justify-content:center;padding:32px}
.auth-card{width:100%;max-width:380px}
.tabs{display:flex;gap:8px;margin-bottom:18px}
.tabs button{flex:1;background:var(--soft);color:var(--ink)}
.tabs button.active{background:var(--brand);color:#fff}
.err{color:var(--bad);font-size:13px;margin-top:8px;min-height:18px}

/* dashboard */
.topbar{display:flex;align-items:center;gap:14px;margin-bottom:20px}
.logo{font-weight:800;font-size:18px}
.logo span{color:var(--brand)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px}
.stat .n{font-size:30px;font-weight:800;letter-spacing:-.5px}
.stat .l{color:var(--muted);font-size:13px;margin-top:2px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:20px}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em}
code.kbd{background:var(--soft);padding:2px 7px;border-radius:6px;font-size:13px}
@media(max-width:860px){.auth-hero{grid-template-columns:1fr}.auth-left{display:none}.stats{grid-template-columns:repeat(2,1fr)}.grid2{grid-template-columns:1fr}}

/* nav */
.nav{display:flex;gap:4px;margin-left:6px}
.nav a{padding:6px 12px;border-radius:8px;color:var(--muted);font-weight:600;font-size:14px}
.nav a.active{background:var(--soft);color:var(--brand)}
.nav a:hover{background:var(--soft)}

/* calendar */
.cal-toolbar{display:flex;align-items:center;gap:8px;margin-bottom:16px}
.viewtoggle{display:flex;gap:2px;background:var(--soft);border-radius:9px;padding:2px;margin-right:6px}
.viewtoggle button{background:transparent;color:var(--muted);padding:6px 14px;border-radius:7px;font-weight:600}
.viewtoggle button.active{background:var(--card);color:var(--ink);box-shadow:var(--shadow)}
.cal-card{padding:0;overflow:hidden}
.cal-head{display:grid;grid-template-columns:56px repeat(7,1fr);border-bottom:1px solid var(--line)}
.cal-dayhead{padding:10px 8px;text-align:center;font-size:13px;color:var(--muted);border-left:1px solid var(--line)}
.cal-dayhead .dd{font-weight:800;color:var(--ink);font-size:15px}
.cal-dayhead.today,.cal-dayhead.today .dd{color:var(--brand)}
.cal-body{display:flex;max-height:610px;overflow-y:auto}
.cal-gutter{width:56px;position:relative;flex:none}
.hrlabel{position:absolute;right:8px;font-size:11px;color:var(--muted)}
.cal-cols{flex:1;display:grid;grid-template-columns:repeat(7,1fr)}
.cal-col{position:relative;cursor:pointer;border-left:1px solid var(--line);
  background:repeating-linear-gradient(to bottom,transparent 0,transparent 45px,var(--line) 45px,var(--line) 46px)}
.cal-col.today{background:linear-gradient(rgba(130,140,165,.07),rgba(130,140,165,.07)),repeating-linear-gradient(to bottom,transparent 0,transparent 45px,var(--line) 45px,var(--line) 46px)}
.appt{position:absolute;cursor:default;background:var(--brand);color:#fff;border-radius:8px;
  padding:5px 7px;overflow:hidden;font-size:12px;box-shadow:0 1px 3px rgba(0,0,0,.22)}
.appt-t{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:0 18px 0 20px}
.appt-d{opacity:.9;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.appt-btn{margin-top:4px;background:rgba(255,255,255,.22);color:#fff;border:0;border-radius:6px;
  padding:3px 8px;font-size:11px;font-weight:700;cursor:pointer}
.appt-btn:hover{background:rgba(255,255,255,.34)}
.appt-x{position:absolute;top:1px;right:2px;width:18px;height:18px;padding:0;line-height:16px;text-align:center;
  font-size:15px;border:0;border-radius:5px;background:rgba(255,255,255,.18);color:#fff;cursor:pointer;opacity:0}
.appt:hover .appt-x{opacity:1}
.appt-x:hover{background:rgba(255,255,255,.38)}
.appt-done-btn{position:absolute;top:1px;left:2px;width:18px;height:18px;padding:0;line-height:16px;text-align:center;
  font-size:14px;border:0;border-radius:5px;background:rgba(255,255,255,.22);color:#fff;cursor:pointer}
.appt-done-btn:hover{background:rgba(255,255,255,.42)}
.cal-ghost{position:absolute;left:2px;right:2px;border:1.5px dashed var(--brand);border-radius:8px;
  background:rgba(79,70,229,.09);pointer-events:none;display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;color:var(--brand)}
.appt.done{background:var(--good);box-shadow:0 1px 3px rgba(0,0,0,.22)}
.appt-done{margin-top:4px;font-size:11px;font-weight:700;opacity:.95}

/* modal */
.modal{display:none;position:fixed;inset:0;background:rgba(15,23,42,.5);z-index:50;align-items:center;justify-content:center;padding:20px}
.modal-card{background:var(--card);border-radius:14px;box-shadow:0 20px 60px rgba(16,24,40,.25);padding:24px;width:100%;max-width:460px}

/* --- mobile / responsive --- */
@media(max-width:640px){
  .wrap{padding:14px}
  .topbar{flex-wrap:wrap;gap:10px;margin-bottom:16px}
  .topbar .spacer{display:none}
  .cal-toolbar{flex-wrap:wrap;gap:8px}
  .cal-toolbar h2{flex-basis:100%;font-size:15px;margin:2px 0}
  .cal-toolbar .spacer{display:none}

  /* recent-activity table -> stacked cards */
  table thead{display:none}
  table tr{display:block;border:1px solid var(--line);border-radius:10px;padding:6px 12px;margin-bottom:10px}
  table td{display:block;border:0;padding:6px 0;text-align:right;overflow:hidden}
  table td:before{content:attr(data-label);float:left;color:var(--muted);font-weight:700;
    font-size:11px;text-transform:uppercase;letter-spacing:.04em;padding-top:3px}
  table td:empty{display:none}
  table td[colspan]{text-align:center}
  table td[colspan]:before{display:none}
}
/* touch devices: the delete x can't rely on hover */
@media(hover:none){
  .appt-x{opacity:.85}
}