/* TAT-KVG Console — login page. Same paper-light palette as the console. */

:root {
  --ground: #f6f7f4;
  --panel: #ffffff;
  --ink: #1c2428;
  --ink-soft: #5c6b73;
  --line: #e3e6df;
  --action: #2b4a8b;
  --danger: #a63d2f;

  --math: #d9822b;
  --code: #0f8a8a;
  --agentic: #7b5ea7;
  --core: #5c6b73;

  --mono: ui-monospace, "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--ground);
  color: var(--ink);
  font: 15px/1.5 var(--sans);
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

/* faint graph in the background */
#backdrop {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
#backdrop .edges line { stroke: #d5dad0; stroke-width: 1.2; }
#backdrop .nodes circle { opacity: 0.5; }
#backdrop .n-math { fill: var(--math); }
#backdrop .n-code { fill: var(--code); }
#backdrop .n-agentic { fill: var(--agentic); }
#backdrop .n-core { fill: var(--core); }

#card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 36px 36px 30px;
  box-shadow: 0 12px 40px rgba(28, 36, 40, 0.08);
  text-align: center;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.brand-mark {
  width: 34px; height: 34px; border-radius: 50%;
  background:
    radial-gradient(circle at 30% 65%, var(--code) 0 34%, transparent 36%),
    radial-gradient(circle at 75% 28%, var(--math) 0 26%, transparent 28%),
    radial-gradient(circle at 75% 78%, var(--agentic) 0 26%, transparent 28%);
  border: 1px solid var(--line);
}

.brand h1 {
  margin: 0;
  font: 600 21px/1 var(--mono);
  letter-spacing: 0.02em;
}
.brand h1 span { color: var(--ink-soft); font-weight: 400; }

.tagline {
  margin: 10px 0 0;
  font: 12px/1.4 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-soft);
}

.lede { margin: 26px 0 20px; color: var(--ink); }

.error {
  margin: 20px 0 0;
  padding: 10px 14px;
  border: 1px solid color-mix(in srgb, var(--danger) 40%, var(--line));
  border-radius: 8px;
  background: #f8eeec;
  color: var(--danger);
  font-size: 13px;
}

#google-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: 600 15px/1 var(--sans);
  text-decoration: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.08s ease;
}
#google-btn svg { width: 20px; height: 20px; flex: none; }
#google-btn:hover {
  border-color: var(--action);
  box-shadow: 0 2px 10px rgba(43, 74, 139, 0.15);
}
#google-btn:active { transform: translateY(1px); }
#google-btn:focus-visible { outline: 2px solid var(--action); outline-offset: 2px; }

.note { margin: 16px 0 0; font-size: 12px; color: var(--ink-soft); }

/* setup mode */
.steps {
  margin: 0;
  padding-left: 20px;
  text-align: left;
  font-size: 13.5px;
  color: var(--ink);
}
.steps li { margin-bottom: 12px; }
.steps a { color: var(--action); }
.steps code, .note code {
  font: 12px/1.6 var(--mono);
  background: var(--ground);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 2px 6px;
  word-break: break-all;
}
.chips { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; }
.chips code { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 35%, var(--line)); }

#foot {
  position: relative;
  z-index: 1;
  margin-top: 18px;
  font: 11px/1 var(--mono);
  color: var(--ink-soft);
  opacity: 0.8;
}

@media (max-width: 480px) {
  #card { padding: 28px 22px 24px; }
}