:root {
  --font-main: "Manrope", "Avenir Next", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Consolas", monospace;

  --bg: #f3f5f9;
  --bg-soft: #ffffff;
  --text: #152033;
  --text-muted: #5b667a;
  --border: #dbe1eb;
  --primary: #1d4ed8;
  --primary-ink: #ffffff;
  --secondary: #0f766e;
  --surface-shadow: 0 18px 42px rgba(15, 23, 42, 0.08);
  --surface-shadow-soft: 0 8px 26px rgba(15, 23, 42, 0.06);
  --hero-glow: radial-gradient(circle at 80% 20%, rgba(34, 197, 94, 0.18), transparent 55%), radial-gradient(circle at 15% 20%, rgba(37, 99, 235, 0.15), transparent 52%);

  --success: #16a34a;
  --warning: #f59e0b;
  --danger: #dc2626;
  --info: #2563eb;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;

  --transition: 220ms ease;
}

[data-theme="dark"] {
  --bg: #0b1220;
  --bg-soft: #131d31;
  --text: #e6edf8;
  --text-muted: #9ca9c2;
  --border: #26334d;
  --primary: #60a5fa;
  --primary-ink: #061224;
  --secondary: #34d399;
  --surface-shadow: 0 20px 46px rgba(2, 7, 20, 0.55);
  --surface-shadow-soft: 0 10px 24px rgba(2, 7, 20, 0.45);
  --hero-glow: radial-gradient(circle at 82% 20%, rgba(16, 185, 129, 0.2), transparent 58%), radial-gradient(circle at 15% 20%, rgba(59, 130, 246, 0.2), transparent 52%);

  --success: #22c55e;
  --warning: #fbbf24;
  --danger: #f87171;
  --info: #60a5fa;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  letter-spacing: 0.01em;
  transition: background-color var(--transition), color var(--transition);
}

a {
  color: inherit;
  text-decoration: none;
}

img,
svg {
  display: block;
  max-width: 100%;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.container {
  width: min(1160px, calc(100% - 2rem));
  margin: 0 auto;
}

.section {
  padding: 3.5rem 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.04rem;
  letter-spacing: 0.02em;
}

.brand img {
  width: 132px;
  height: auto;
  object-fit: contain;
  display: block;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-soft) 90%, transparent);
}

.main-nav a {
  padding: 0.42rem 0.82rem;
  border-radius: 999px;
  font-weight: 600;
  color: var(--text-muted);
  transition: background-color var(--transition), color var(--transition);
}

.main-nav a.is-active,
.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--text);
  background: color-mix(in srgb, var(--primary) 15%, var(--bg-soft));
  outline: none;
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  border-radius: 999px;
  padding: 0.45rem 0.86rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition), transform var(--transition);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--primary) 40%, var(--border));
  outline: none;
}

.hero {
  background: var(--hero-glow);
}

.hero-grid {
  display: grid;
  gap: 1.2rem;
}

.eyebrow {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 0.3rem 0.7rem;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-muted);
  background: color-mix(in srgb, var(--bg-soft) 88%, transparent);
}

h1,
h2,
h3 {
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 {
  margin: 0.9rem 0 1rem;
  font-size: clamp(1.8rem, 4.6vw, 3rem);
  max-width: 18ch;
}

h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.35rem, 2.8vw, 2.05rem);
}

h3 {
  margin: 0.2rem 0 0.6rem;
  font-size: clamp(1.08rem, 2.2vw, 1.34rem);
}

.lead {
  margin: 0;
  color: var(--text-muted);
  max-width: 65ch;
}

.hero-actions {
  margin-top: 1.3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.micro-copy {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.hero-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  box-shadow: var(--surface-shadow);
}

.hero-card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.65rem;
}

.hero-card ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
}

.hero-card li + li {
  margin-top: 0.3rem;
}

.card-links {
  margin-top: 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.card-links a {
  color: var(--primary);
  font-weight: 600;
}

.hero-quick {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--surface-shadow);
  display: grid;
  gap: 0.72rem;
}

.hero-quick h2 {
  margin: 0;
  font-size: 1.24rem;
}

.hero-quick-copy {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.hero-quick-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.hero-quick textarea {
  min-height: 145px;
}

.hero-quick-actions {
  margin-top: 0;
}

.hero-quick-note {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.hero-brand-strip {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.58rem 0.68rem;
  background: color-mix(in srgb, var(--primary) 8%, var(--bg-soft));
  display: flex;
  align-items: center;
  gap: 0.58rem;
}

.hero-brand-logo {
  width: 116px;
  height: auto;
  object-fit: contain;
  display: block;
}

.hero-brand-strip span {
  color: var(--text-muted);
  font-size: 0.84rem;
}

.btn {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.64rem 0.96rem;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition), color var(--transition);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), color-mix(in srgb, var(--primary) 80%, #1e40af));
  color: var(--primary-ink);
  box-shadow: var(--surface-shadow-soft);
}

.btn-secondary {
  background: color-mix(in srgb, var(--secondary) 14%, var(--bg-soft));
  border-color: color-mix(in srgb, var(--secondary) 45%, var(--border));
  color: var(--text);
}

.btn-ghost {
  background: var(--bg-soft);
  border-color: var(--border);
  color: var(--text);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.ad-section {
  padding-top: 0;
  padding-bottom: 0;
}

.ad-slot {
  border: 1px solid color-mix(in srgb, var(--text-muted) 20%, var(--border));
  border-radius: var(--radius-md);
  min-height: 112px;
  padding: 0.25rem;
  background: color-mix(in srgb, var(--bg-soft) 92%, transparent);
  overflow: hidden;
}

.ad-slot ins.adsbygoogle {
  width: 100% !important;
  min-height: 100px;
}

.section-intro {
  margin-bottom: 1rem;
}

.section-intro p {
  margin: 0;
  color: var(--text-muted);
}

.generator-layout {
  display: grid;
  gap: 1rem;
}

.panel {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--surface-shadow-soft);
}

.control-block + .control-block {
  margin-top: 0.95rem;
}

.control-label {
  margin: 0 0 0.45rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.segmented,
.preset-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.preset-tabs {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.segmented-btn,
.preset-btn {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  padding: 0.58rem 0.7rem;
  cursor: pointer;
  font-weight: 700;
  transition: all var(--transition);
}

.segmented-btn.is-active,
.preset-btn.is-active,
.segmented-btn:hover,
.preset-btn:hover,
.segmented-btn:focus-visible,
.preset-btn:focus-visible {
  color: var(--text);
  border-color: color-mix(in srgb, var(--primary) 40%, var(--border));
  background: color-mix(in srgb, var(--primary) 14%, var(--bg-soft));
  outline: none;
}

.form-grid {
  display: grid;
  gap: 0.72rem;
  margin-top: 0.92rem;
}

.field {
  display: grid;
  gap: 0.35rem;
}

.field span {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-weight: 600;
}

select,
textarea {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.62rem 0.7rem;
  font: inherit;
  color: var(--text);
  background: color-mix(in srgb, var(--bg-soft) 95%, transparent);
  transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition);
}

textarea {
  resize: vertical;
  min-height: 220px;
  line-height: 1.42;
}

select:focus-visible,
textarea:focus-visible {
  outline: none;
  border-color: color-mix(in srgb, var(--primary) 45%, var(--border));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 22%, transparent);
}

.button-row {
  margin-top: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.mapping-fallback {
  margin-top: 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  background: color-mix(in srgb, var(--bg) 58%, var(--bg-soft));
}

.mapping-title {
  margin: 0;
  font-weight: 600;
  color: var(--text-muted);
}

.message {
  margin: 0.8rem 0 0;
  font-size: 0.93rem;
}

.message.error {
  color: var(--danger);
}

.message.info {
  color: var(--info);
}

.chart-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.5rem;
}

.chart-frame {
  position: relative;
  margin-top: 0.82rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background:
    radial-gradient(circle at 22% 10%, color-mix(in srgb, var(--primary) 12%, transparent), transparent 44%),
    linear-gradient(145deg, color-mix(in srgb, var(--bg-soft) 88%, transparent), color-mix(in srgb, var(--bg) 92%, transparent));
}

.chart-output {
  min-height: 420px;
  padding: 0.5rem;
  display: grid;
  place-items: center;
}

.chart-output svg {
  width: min(100%, 900px);
  height: auto;
  margin-inline: auto;
}

.chart-tooltip {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 5;
  transform: translate(-50%, calc(-100% - 12px));
  background: color-mix(in srgb, #111827 88%, transparent);
  color: #f8fafc;
  border-radius: 8px;
  padding: 0.38rem 0.5rem;
  font-size: 0.8rem;
  white-space: nowrap;
  box-shadow: var(--surface-shadow-soft);
}

.chart-summary {
  margin: 0.72rem 0 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.learn-grid {
  display: grid;
  gap: 0.8rem;
}

.learn-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem;
  box-shadow: var(--surface-shadow-soft);
}

.learn-card p {
  margin: 0;
  color: var(--text-muted);
}

.inline-link {
  margin-top: 0.65rem;
  display: inline-block;
  color: var(--primary);
  font-weight: 700;
}

.faq-wrap details {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.9rem;
  box-shadow: var(--surface-shadow-soft);
}

.faq-wrap details + details {
  margin-top: 0.72rem;
}

.faq-wrap summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-wrap p {
  margin: 0.65rem 0 0;
  color: var(--text-muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.4rem 0 2.2rem;
}

.footer-grid {
  display: grid;
  gap: 0.8rem;
}

.footer-grid p {
  margin: 0;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.footer-links a {
  color: var(--primary);
  font-weight: 700;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
}

.footer-brand img {
  width: 136px;
  height: auto;
  object-fit: contain;
  display: block;
}

@media (min-width: 760px) {
  .hero-grid {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: stretch;
    gap: 1.1rem;
  }

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

  .learn-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .section {
    padding: 4.2rem 0;
  }

  .generator-layout {
    grid-template-columns: minmax(320px, 420px) minmax(420px, 1fr);
    align-items: start;
  }

  .learn-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 759px) {
  .main-nav {
    order: 3;
    width: 100%;
    justify-content: space-between;
    margin-top: 0.2rem;
  }

  .header-inner {
    flex-wrap: wrap;
    padding: 0.55rem 0;
  }

  .brand img {
    width: 108px;
  }

  .chart-output {
    min-height: 360px;
  }

  .hero-quick-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}