/* ────────────────────────────────────────────────────────────────
   Embott / Chatry — shared styles
──────────────────────────────────────────────────────────────── */
:root {
  --ink: #0a0a0a;
  --ink-2: #1f1f1f;
  --muted: #6b7280;
  --bg: #ffffff;
  --bg-2: #fafafa;
  --bg-3: #f5f5f5;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --accent: #d4ff3a;
  --accent-dark: #b3da14;
  --danger: #dc2626;
  --success: #059669;
  --info: #2563eb;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 32px rgba(0,0,0,.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --container: 1120px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { margin: 0 0 .4em; line-height: 1.2; }
h1 { font-size: 44px; letter-spacing: -0.02em; }
h2 { font-size: 30px; letter-spacing: -0.015em; }
h3 { font-size: 20px; }
p { margin: 0 0 1em; }

/* Layout */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 560px; margin: 0 auto; padding: 0 24px; }
.row { display: flex; gap: 24px; }
.row.center { align-items: center; }
.col { flex: 1; }
.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 720px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
  .row { flex-direction: column; }
  h1 { font-size: 32px; }
}

/* Nav */
.nav { padding: 18px 0; border-bottom: 1px solid var(--border); background: rgba(255,255,255,.85); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 50; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.brand { font-weight: 800; font-size: 22px; letter-spacing: -0.02em; display: inline-flex; align-items: center; gap: 8px; }
.brand-dot { width: 12px; height: 12px; background: var(--accent); border-radius: 4px; display: inline-block; }
.nav-links { display: flex; gap: 22px; align-items: center; font-size: 15px; color: var(--muted); }
.nav-links a:hover { color: var(--ink); text-decoration: none; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 18px; border-radius: var(--radius-sm); font-weight: 600; font-size: 15px; cursor: pointer; border: 1px solid transparent; transition: transform .04s ease, box-shadow .15s ease, background .15s ease; line-height: 1; user-select: none; }
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #000; }
.btn-accent { background: var(--accent); color: var(--ink); }
.btn-accent:hover { background: var(--accent-dark); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--bg-2); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-lg { padding: 14px 22px; font-size: 16px; }
.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* Cards */
.card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm); }
.card-pad-lg { padding: 32px; }
.card-hover { transition: box-shadow .2s, border-color .2s; cursor: pointer; }
.card-hover:hover { box-shadow: var(--shadow); border-color: var(--border-strong); }
.card-selected { border-color: var(--ink); box-shadow: 0 0 0 3px rgba(10,10,10,.06); }

/* Forms */
label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-2); margin-bottom: 6px; }
.help { font-size: 13px; color: var(--muted); margin-top: 6px; }
input[type=text], input[type=email], input[type=password], input[type=url], input[type=number], textarea, select {
  width: 100%; padding: 11px 14px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); font-size: 15px; font-family: inherit; background: #fff; color: var(--ink); transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px rgba(10,10,10,.08); }
.field { margin-bottom: 18px; }
.check { display: flex; align-items: flex-start; gap: 10px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); cursor: pointer; transition: border-color .15s, background .15s; }
.check:hover { border-color: var(--border-strong); }
.check input { margin-top: 3px; }
.check.selected { border-color: var(--ink); background: #fafafa; }

/* Toasts / alerts */
.alert { padding: 12px 16px; border-radius: var(--radius-sm); font-size: 14px; margin-bottom: 16px; border: 1px solid; }
.alert-error { background: #fef2f2; border-color: #fecaca; color: var(--danger); }
.alert-success { background: #ecfdf5; border-color: #a7f3d0; color: var(--success); }
.alert-info { background: #eff6ff; border-color: #bfdbfe; color: var(--info); }

/* Pills / badges */
.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--bg-3); color: var(--ink-2); }
.badge-accent { background: var(--accent); color: var(--ink); }
.badge-success { background: #d1fae5; color: var(--success); }
.badge-info { background: #dbeafe; color: var(--info); }

/* Utility */
.muted { color: var(--muted); }
.small { font-size: 13px; }
.mono { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 13px; }
.code { background: var(--bg-3); padding: 12px 14px; border-radius: var(--radius-sm); font-family: ui-monospace, monospace; font-size: 13px; word-break: break-all; white-space: pre-wrap; }
.center { text-align: center; }
.mt-0 { margin-top: 0; } .mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; } .mt-4 { margin-top: 32px; } .mt-5 { margin-top: 48px; }
.mb-0 { margin-bottom: 0; } .mb-1 { margin-bottom: 8px; } .mb-2 { margin-bottom: 16px; } .mb-3 { margin-bottom: 24px; } .mb-4 { margin-bottom: 32px; }
.flex { display: flex; } .gap-1 { gap: 8px; } .gap-2 { gap: 16px; } .gap-3 { gap: 24px; }
.between { justify-content: space-between; } .items-center { align-items: center; }
.hidden { display: none !important; }

/* Onboarding-specific */
.steps-bar { display: flex; gap: 4px; margin-bottom: 32px; }
.step-dot { flex: 1; height: 4px; border-radius: 2px; background: var(--border); }
.step-dot.done { background: var(--accent); }
.step-dot.active { background: var(--ink); }

.studying-row { display: flex; align-items: center; gap: 12px; padding: 12px 0; opacity: 0; transform: translateY(8px); transition: opacity .4s, transform .4s; }
.studying-row.show { opacity: 1; transform: translateY(0); }
.studying-check { width: 22px; height: 22px; border-radius: 999px; background: var(--accent); display: inline-flex; align-items: center; justify-content: center; color: var(--ink); font-size: 14px; flex-shrink: 0; }
.studying-spin { width: 22px; height: 22px; border-radius: 999px; border: 2px solid var(--border); border-top-color: var(--ink); animation: spin 0.8s linear infinite; flex-shrink: 0; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Hero */
.hero { padding: 80px 0 60px; text-align: center; }
.hero h1 { max-width: 760px; margin: 0 auto 16px; }
.hero .lead { font-size: 19px; color: var(--muted); max-width: 620px; margin: 0 auto 28px; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.feature { padding: 28px; }
.feature-icon { width: 44px; height: 44px; border-radius: 10px; background: var(--accent); display: inline-flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 16px; }

/* Dashboard layout */
.dash { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.dash-side { background: var(--bg-2); border-right: 1px solid var(--border); padding: 24px 16px; }
.dash-main { padding: 32px 40px; max-width: 1100px; }
.dash-side .brand { padding: 0 8px 24px; display: flex; }
.dash-nav a { display: block; padding: 9px 12px; border-radius: var(--radius-sm); color: var(--muted); font-weight: 500; font-size: 14px; margin-bottom: 2px; }
.dash-nav a:hover { background: rgba(0,0,0,.04); color: var(--ink); text-decoration: none; }
.dash-nav a.active { background: var(--ink); color: #fff; }
@media (max-width: 720px) {
  .dash { grid-template-columns: 1fr; }
  .dash-side { display: none; }
  .dash-main { padding: 24px; }
}

/* KPI tiles */
.kpi { padding: 20px; }
.kpi .label { font-size: 13px; color: var(--muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.04em; }
.kpi .value { font-size: 30px; font-weight: 700; line-height: 1; }
.kpi .sub { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* Conversation list */
.conv-row { display: grid; grid-template-columns: 1fr auto auto; gap: 16px; padding: 14px 16px; border-bottom: 1px solid var(--border); align-items: center; }
.conv-row:hover { background: var(--bg-2); }

/* Footer */
.foot { padding: 40px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; text-align: center; margin-top: 60px; }