:root {
  color-scheme: light;
  --bg: #f6f8fc;
  --panel: #ffffff;
  --border: #dbe3ef;
  --text: #172033;
  --muted: #64748b;
  --blue: #1a73e8;
  --green: #0f9d58;
  --red: #d93025;
  --ink: #0f172a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 4%, rgba(66, 133, 244, 0.16), transparent 30%),
    radial-gradient(circle at 88% 12%, rgba(15, 157, 88, 0.12), transparent 26%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 44%, #eef4ff 100%);
  color: var(--text);
  font-family: Inter, system-ui, sans-serif;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 0;
  border-radius: 999px;
  background: var(--blue);
  color: white;
  cursor: pointer;
  font-weight: 700;
  padding: 0.75rem 1rem;
}

button:hover {
  background: #1558b0;
}

button.ghost {
  background: #e8f0fe;
  color: #174ea6;
}

.hidden {
  display: none !important;
}

.shell {
  width: min(1220px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 56px;
}

.topbar {
  align-items: center;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin-bottom: 22px;
}

.eyebrow {
  color: var(--blue);
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 6px;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(1.45rem, 3vw, 2.3rem);
  line-height: 1;
  margin-bottom: 0;
}

h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

p,
.muted {
  color: var(--muted);
}

.session {
  align-items: center;
  color: var(--muted);
  display: flex;
  gap: 12px;
}

.landing {
  display: grid;
  gap: 34px;
}

.hero {
  align-items: center;
  display: grid;
  gap: 42px;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.88fr);
  min-height: 590px;
  padding: 42px 0 18px;
}

.hero-copy h2 {
  color: var(--ink);
  font-size: clamp(3rem, 7vw, 6.4rem);
  letter-spacing: 0;
  line-height: 0.94;
  margin: 16px 0 22px;
  max-width: 760px;
}

.hero-text {
  color: #475569;
  font-size: 1.18rem;
  line-height: 1.7;
  max-width: 620px;
}

.pill {
  align-items: center;
  background: #e8f0fe;
  border: 1px solid #d2e3fc;
  border-radius: 999px;
  color: #174ea6;
  display: inline-flex;
  font-size: 0.92rem;
  font-weight: 700;
  margin: 0;
  padding: 9px 14px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.primary-link,
.secondary-link {
  align-items: center;
  border-radius: 999px;
  display: inline-flex;
  font-weight: 800;
  min-height: 48px;
  padding: 0 20px;
  text-decoration: none;
}

.primary-link {
  background: var(--blue);
  color: white;
}

.secondary-link {
  background: white;
  border: 1px solid var(--border);
  color: #1e293b;
}

.hero-visual {
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.96), rgba(239, 246, 255, 0.94)),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220' viewBox='0 0 220 220'%3E%3Cg fill='none' stroke='%23dbeafe' stroke-width='1'%3E%3Cpath d='M0 44h220M0 88h220M0 132h220M0 176h220M44 0v220M88 0v220M132 0v220M176 0v220'/%3E%3C/g%3E%3C/svg%3E");
  border: 1px solid rgba(148, 163, 184, 0.34);
  border-radius: 28px;
  box-shadow: 0 34px 90px rgba(15, 23, 42, 0.15);
  display: grid;
  gap: 18px;
  padding: 20px;
}

.visual-toolbar {
  align-items: center;
  color: #475569;
  display: flex;
  gap: 8px;
  min-height: 28px;
}

.visual-toolbar span {
  background: #cbd5e1;
  border-radius: 999px;
  display: block;
  height: 10px;
  width: 10px;
}

.visual-toolbar strong {
  margin-left: auto;
}

.prompt-card,
.answer-card,
.signal-strip {
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid #e2e8f0;
  border-radius: 22px;
  padding: 18px;
}

.prompt-label,
.answer-head span,
.signal-strip span {
  color: #64748b;
  display: block;
  font-size: 0.78rem;
  font-weight: 800;
  margin-bottom: 7px;
  text-transform: uppercase;
}

.prompt-card p {
  color: #1e293b;
  font-size: 1.12rem;
  line-height: 1.5;
  margin: 0;
}

.answer-head {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin-bottom: 14px;
}

.answer-head strong {
  background: #e6f4ea;
  border-radius: 999px;
  color: #0f7b43;
  font-size: 0.8rem;
  padding: 6px 10px;
}

.mini-bars {
  display: grid;
  gap: 12px;
}

.mini-bars div {
  align-items: center;
  display: grid;
  gap: 10px;
  grid-template-columns: 54px 1fr 46px;
}

.mini-bars span,
.mini-bars em {
  color: #334155;
  font-style: normal;
  font-weight: 800;
}

.mini-bars b {
  background: linear-gradient(90deg, #4285f4, #34a853);
  border-radius: 999px;
  display: block;
  height: 12px;
}

.signal-strip {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, 1fr);
}

.signal-strip div {
  border-left: 3px solid #4285f4;
  padding-left: 12px;
}

.signal-strip strong {
  color: #0f172a;
}

.auth-section {
  display: grid;
  gap: 20px;
  padding-bottom: 24px;
}

.auth-intro {
  max-width: 680px;
}

.auth-intro h2 {
  color: var(--ink);
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.02;
}

.auth-grid,
.security-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.provider-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
  margin: 16px 0;
}

.provider-btn {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  color: #1e293b;
}

.stacked-form {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.panel {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 22px 80px rgba(15, 23, 42, 0.09);
  padding: 22px;
}

.auth-card {
  border-radius: 22px;
}

label {
  color: var(--muted);
  display: grid;
  gap: 7px;
  margin: 14px 0;
}

input,
select {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  color: var(--text);
  min-height: 44px;
  padding: 0.65rem 0.75rem;
  width: 100%;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  overflow-x: auto;
}

.tab {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
}

.tab.active {
  background: #e8f0fe;
  border-color: var(--blue);
  color: #174ea6;
}

.panel-title {
  align-items: start;
  display: flex;
  gap: 18px;
  justify-content: space-between;
  margin-bottom: 18px;
}

.inline-form {
  align-items: center;
  display: grid;
  gap: 10px;
  grid-template-columns: 130px 96px auto;
}

.metric-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 18px;
}

.metric-grid div {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 14px;
}

.metric-grid span {
  color: var(--muted);
  display: block;
  font-size: 0.8rem;
  margin-bottom: 6px;
}

.metric-grid strong {
  font-size: 1.15rem;
}

.chart-wrap {
  height: 390px;
}

.optimizer-form {
  display: grid;
  gap: 14px;
  grid-template-columns: 2fr 1fr 1fr auto;
}

.results {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.weight-row {
  align-items: center;
  display: grid;
  gap: 12px;
  grid-template-columns: 80px 1fr 80px;
}

.bar {
  background: #f8fafc;
  border-radius: 999px;
  height: 12px;
  overflow: hidden;
}

.bar span {
  background: linear-gradient(90deg, var(--blue), var(--green));
  display: block;
  height: 100%;
}

.checks {
  color: #334155;
  line-height: 1.9;
  margin-bottom: 0;
}

#toast {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  bottom: 20px;
  box-shadow: 0 18px 60px rgba(15, 23, 42, 0.18);
  color: var(--text);
  max-width: 520px;
  padding: 12px 14px;
  position: fixed;
  right: 20px;
  transform: translateY(120px);
  transition: transform 0.2s ease;
}

#toast.show {
  transform: translateY(0);
}

.positive {
  color: var(--green);
}

.negative {
  color: var(--red);
}

@media (max-width: 840px) {
  .topbar,
  .panel-title {
    align-items: stretch;
    flex-direction: column;
  }

  .auth-grid,
  .security-grid,
  .metric-grid,
  .optimizer-form {
    grid-template-columns: 1fr;
  }

  .inline-form {
    grid-template-columns: 1fr;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 20px;
  }

  .hero-visual {
    order: -1;
  }

  .hero-copy h2 {
    font-size: clamp(2.8rem, 16vw, 4.2rem);
  }

  .signal-strip {
    grid-template-columns: 1fr;
  }
}