/* KAIN Tool — shared design tokens + base reset.
 * Dark theme tuned to match agencygeobm-2i5 hub aesthetic:
 * zinc-950 background, emerald accent, JetBrains Mono for code. */

:root {
  --kain-bg:          oklch(13% 0.005 250);
  --kain-bg-elev:     oklch(17% 0.005 250);
  --kain-surface:     oklch(20% 0.005 250);
  --kain-surface-hi:  oklch(24% 0.008 250);
  --kain-border:      oklch(30% 0.01 250);
  --kain-border-hi:   oklch(40% 0.015 250);
  --kain-ink:         oklch(96% 0.005 250);
  --kain-ink-soft:    oklch(78% 0.01 250);
  --kain-muted:       oklch(60% 0.015 250);
  --kain-muted-dim:   oklch(48% 0.015 250);

  --kain-accent:      oklch(78% 0.18 162);   /* emerald */
  --kain-accent-soft: oklch(40% 0.12 162 / 0.18);
  --kain-accent-rim:  oklch(72% 0.16 162 / 0.5);
  --kain-cyan:        oklch(78% 0.13 220);
  --kain-violet:      oklch(72% 0.18 290);

  --kain-success:     oklch(72% 0.18 152);
  --kain-success-bg:  oklch(40% 0.1 152 / 0.18);
  --kain-warn:        oklch(82% 0.18 78);
  --kain-warn-bg:     oklch(45% 0.12 78 / 0.2);
  --kain-danger:      oklch(72% 0.21 22);
  --kain-danger-bg:   oklch(45% 0.18 22 / 0.22);

  --kain-radius-sm:   6px;
  --kain-radius:      10px;
  --kain-radius-lg:   14px;
  --kain-radius-xl:   18px;

  --kain-font:  'Inter', system-ui, -apple-system, sans-serif;
  --kain-mono:  'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --kain-shadow-card: 0 1px 0 oklch(100% 0 0 / 0.04) inset,
                      0 10px 30px oklch(0% 0 0 / 0.4);
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--kain-bg);
  color: var(--kain-ink);
  font-family: var(--kain-font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(900px 600px at 80% -10%, oklch(40% 0.18 162 / 0.10), transparent 60%),
    radial-gradient(700px 500px at 5% 110%, oklch(40% 0.18 290 / 0.08), transparent 60%),
    var(--kain-bg);
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
code, kbd, pre { font-family: var(--kain-mono); }

::selection {
  background: var(--kain-accent-soft);
  color: var(--kain-ink);
}

/* ── Header ─────────────────────────────────────────────────────────── */

.kain-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 32px;
  border-bottom: 1px solid var(--kain-border);
  background: oklch(15% 0.005 250 / 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.kain-brand {
  display: inline-flex; align-items: center; gap: 12px;
}

/* Auth widget (top-right of header) */
#auth-widget {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 22px;
  font-size: 12px;
  font-weight: 600;
  color: var(--kain-muted);
}
.kain-auth-name {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--kain-ink-soft);
  font-family: var(--kain-mono);
}
.kain-auth-name::before {
  content: '';
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--kain-accent);
  box-shadow: 0 0 0 3px var(--kain-accent-soft);
}
.kain-auth-login {
  color: var(--kain-accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.kain-auth-login:hover { filter: brightness(1.15); }
.kain-auth-logout {
  background: transparent;
  border: 1px solid var(--kain-border);
  border-radius: var(--kain-radius);
  color: var(--kain-muted);
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all .15s;
}
.kain-auth-logout:hover {
  color: var(--kain-ink);
  border-color: var(--kain-border-hi);
}

.kain-brand-mark {
  width: 22px; height: 22px;
  border-radius: 6px;
  background:
    radial-gradient(circle at 30% 30%, var(--kain-accent), oklch(48% 0.18 162) 50%, oklch(28% 0.1 162) 100%);
  box-shadow:
    0 0 0 1px oklch(100% 0 0 / 0.08) inset,
    0 0 20px oklch(72% 0.18 162 / 0.4);
}

.kain-brand-name {
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--kain-ink);
}
.kain-brand-name em {
  font-style: normal;
  color: var(--kain-muted);
  font-weight: 500;
}

/* Top-nav (visible on landing + tool pages) */
.kain-header-left {
  display: flex; align-items: center;
  min-width: 0;
}
.kain-nav {
  display: flex; align-items: center; gap: 4px;
  margin-left: 18px;
  padding-left: 18px;
  border-left: 1px solid var(--kain-border);
  white-space: nowrap;
}
.kain-nav-link {
  position: relative;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--kain-muted);
  border-radius: var(--kain-radius-sm);
  transition: color .15s, background .15s;
}
.kain-nav-link:hover {
  color: var(--kain-ink-soft);
  background: var(--kain-bg-elev);
}
.kain-nav-link.active {
  color: var(--kain-accent);
  background: var(--kain-accent-soft);
}
.kain-nav-link.active::after {
  content: '';
  position: absolute;
  left: 10px; right: 10px; bottom: -2px;
  height: 2px;
  background: var(--kain-accent);
  border-radius: 2px;
}
@media (max-width: 560px) {
  .kain-nav { gap: 0; margin-left: 10px; padding-left: 10px; }
  .kain-nav-link { padding: 6px 8px; font-size: 11px; }
}

/* ── Footer ─────────────────────────────────────────────────────────── */

.kain-footer {
  margin-top: 80px;
  padding: 28px 32px;
  font-size: 12px;
  color: var(--kain-muted-dim);
  text-align: center;
  border-top: 1px solid var(--kain-border);
}
.kain-footer a { color: var(--kain-muted); }
.kain-footer a:hover { color: var(--kain-ink); }

/* ── App-level layout helpers ───────────────────────────────────────── */

.kain-shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 36px 24px 60px;
}

.kain-back {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px;
  color: var(--kain-muted);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.kain-back:hover { color: var(--kain-ink); }
.kain-back::before { content: '←'; font-size: 14px; }

.kain-page-title {
  display: flex; flex-direction: column; gap: 6px;
  margin-bottom: 28px;
}
.kain-page-title h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.kain-page-title p {
  margin: 0;
  font-size: 14px;
  color: var(--kain-muted);
}

.kain-card-surface {
  background: var(--kain-surface);
  border: 1px solid var(--kain-border);
  border-radius: var(--kain-radius-lg);
  padding: 22px;
  box-shadow: var(--kain-shadow-card);
}
.kain-card-surface + .kain-card-surface { margin-top: 16px; }

.kain-section-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--kain-muted);
  margin: 0 0 14px;
}
.kain-section-title::before {
  content: '';
  width: 3px; height: 12px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--kain-accent), oklch(45% 0.15 162));
}

.kain-input, .kain-textarea {
  width: 100%;
  padding: 11px 14px;
  background: var(--kain-bg-elev);
  border: 1px solid var(--kain-border);
  border-radius: var(--kain-radius);
  color: var(--kain-ink);
  font-family: inherit;
  font-size: 14px;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.kain-input:focus, .kain-textarea:focus {
  outline: none;
  border-color: var(--kain-accent-rim);
  background: var(--kain-surface-hi);
  box-shadow: 0 0 0 3px var(--kain-accent-soft);
}
.kain-input::placeholder, .kain-textarea::placeholder { color: var(--kain-muted-dim); }
.kain-textarea {
  min-height: 110px;
  font-family: var(--kain-mono);
  font-size: 13px;
  resize: vertical;
}

.kain-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--kain-radius);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s, transform .05s;
}
.kain-btn:active { transform: translateY(1px); }
.kain-btn-primary {
  background: linear-gradient(180deg, var(--kain-accent), oklch(60% 0.18 162));
  color: oklch(15% 0.02 162);
  box-shadow:
    0 1px 0 oklch(100% 0 0 / 0.2) inset,
    0 6px 16px oklch(0% 0 0 / 0.3),
    0 0 0 1px var(--kain-accent-rim);
}
.kain-btn-primary:hover { filter: brightness(1.06); }
.kain-btn-ghost {
  background: transparent;
  color: var(--kain-muted);
  border-color: var(--kain-border);
}
.kain-btn-ghost:hover {
  color: var(--kain-ink);
  border-color: var(--kain-border-hi);
}
.kain-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  filter: grayscale(0.5);
}

.kain-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.kain-pill-success { background: var(--kain-success-bg); color: var(--kain-success); }
.kain-pill-danger  { background: var(--kain-danger-bg);  color: var(--kain-danger); }
.kain-pill-warn    { background: var(--kain-warn-bg);    color: var(--kain-warn); }
.kain-pill-muted   { background: oklch(28% 0.005 250); color: var(--kain-muted); }

.kain-toast {
  position: fixed;
  bottom: 24px; right: 24px;
  background: var(--kain-surface-hi);
  border: 1px solid var(--kain-border-hi);
  color: var(--kain-ink);
  padding: 10px 16px;
  border-radius: var(--kain-radius);
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 10px 30px oklch(0% 0 0 / 0.5);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .2s, transform .2s;
  pointer-events: none;
  z-index: 9999;
}
.kain-toast.show { opacity: 1; transform: translateY(0); }
.kain-toast::before {
  content: '✓ ';
  color: var(--kain-accent);
}