/* Bilans OZE — landing page. Same visual identity as the app itself
   (graphite/navy + amber accent), Segoe UI, minimal rounding. */

:root {
  --graphite-950: #0f1218;
  --graphite-900: #14181f;
  --graphite-850: #191e27;
  --graphite-800: #1e2430;
  --graphite-700: #2a3140;
  --graphite-600: #3a4254;
  --ink-100: #e9ecf1;
  --ink-300: #b7bfcc;
  --ink-500: #8791a3;

  --amber: #d99a3d;
  --amber-dark: #a9741f;

  --font-ui: "Segoe UI", system-ui, -apple-system, "Noto Sans", sans-serif;
  --font-mono: "Consolas", "Cascadia Mono", "SFMono-Regular", Menlo, monospace;

  --radius-sm: 2px;
  --radius-md: 4px;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  color: var(--ink-100);
  background: var(--graphite-900);
  line-height: 1.55;
}

a {
  color: var(--amber);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

code {
  font-family: var(--font-mono);
  background: var(--graphite-800);
  padding: 1px 5px;
  border-radius: var(--radius-sm);
  font-size: 0.92em;
}

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 12px;
}
h2 {
  font-size: 26px;
  text-align: center;
  margin-bottom: 32px;
}
h3 {
  font-size: 16px;
  color: var(--ink-100);
}

/* ------------------------------------------------------------------ */
/* Topbar                                                              */
/* ------------------------------------------------------------------ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--graphite-950);
  border-bottom: 1px solid var(--graphite-700);
}
.topbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 15px;
  color: var(--ink-100);
}
.brand span {
  color: var(--amber);
}
.nav {
  display: flex;
  gap: 20px;
  flex: 1;
}
.nav a {
  color: var(--ink-300);
  font-size: 13.5px;
}
.nav a:hover {
  color: var(--ink-100);
  text-decoration: none;
}
.btn-nav {
  white-space: nowrap;
}

/* ------------------------------------------------------------------ */
/* Buttons                                                             */
/* ------------------------------------------------------------------ */
.btn {
  display: inline-block;
  appearance: none;
  border: 1px solid var(--graphite-600);
  background: var(--graphite-800);
  color: var(--ink-100);
  padding: 9px 16px;
  font-size: 13.5px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}
.btn:hover {
  background: var(--graphite-700);
  text-decoration: none;
}
.btn-primary {
  background: var(--amber);
  border-color: var(--amber);
  color: #1a1204;
  font-weight: 600;
}
.btn-primary:hover {
  background: #e5a94f;
  border-color: #e5a94f;
}
.btn-ghost {
  background: transparent;
}
.btn-lg {
  padding: 13px 24px;
  font-size: 15px;
}

/* ------------------------------------------------------------------ */
/* Hero                                                                */
/* ------------------------------------------------------------------ */
.hero {
  background: radial-gradient(circle at 20% 0%, var(--graphite-850), var(--graphite-950));
  padding: 72px 20px 56px;
}
.hero-inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.eyebrow {
  color: var(--amber);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  margin: 0 0 14px;
}
.hero h1 {
  font-size: 38px;
  margin-bottom: 18px;
}
.hero-sub {
  color: var(--ink-300);
  font-size: 16px;
  max-width: 620px;
  margin: 0 auto 30px;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.hero-note {
  color: var(--ink-500);
  font-size: 12.5px;
  max-width: 520px;
  margin: 0 auto;
}

/* ------------------------------------------------------------------ */
/* Feature strip                                                       */
/* ------------------------------------------------------------------ */
.strip {
  border-top: 1px solid var(--graphite-700);
  border-bottom: 1px solid var(--graphite-700);
  background: var(--graphite-850);
}
.strip-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 22px 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.strip-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  text-align: center;
}
.strip-item strong {
  color: var(--amber);
  font-size: 13.5px;
}
.strip-item span {
  color: var(--ink-500);
  font-size: 12px;
}

/* ------------------------------------------------------------------ */
/* Sections                                                            */
/* ------------------------------------------------------------------ */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 64px 20px;
}
.section-alt {
  max-width: none;
  background: var(--graphite-850);
  border-top: 1px solid var(--graphite-700);
  border-bottom: 1px solid var(--graphite-700);
}
.section-alt > * {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

/* Steps */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 680px;
  margin: 0 auto;
}
.steps li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.step-no {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--graphite-800);
  border: 1px solid var(--amber);
  color: var(--amber);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}
.steps p {
  color: var(--ink-300);
  margin: 0;
  font-size: 14px;
}

/* Cards grid */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
.card {
  background: var(--graphite-900);
  border: 1px solid var(--graphite-700);
  border-radius: var(--radius-md);
  padding: 18px;
}
.card p {
  color: var(--ink-300);
  font-size: 13.5px;
  margin: 0;
}

/* Pricing */
.price-card {
  max-width: 420px;
  margin: 0 auto;
  text-align: center;
  background: var(--graphite-850);
  border: 1px solid var(--graphite-700);
  border-radius: var(--radius-md);
  padding: 36px 28px;
}
.price-amount {
  font-size: 44px;
  font-weight: 800;
  color: var(--amber);
  font-family: var(--font-mono);
}
.price-label {
  color: var(--ink-500);
  font-size: 12.5px;
  margin-bottom: 20px;
}
.price-features {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  text-align: left;
  color: var(--ink-300);
  font-size: 13.5px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.price-features li::before {
  content: "✓ ";
  color: var(--amber);
  font-weight: 700;
}
.price-note {
  color: var(--ink-500);
  font-size: 11.5px;
  margin: 12px 0 0;
}

/* FAQ */
.faq {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.faq details {
  background: var(--graphite-850);
  border: 1px solid var(--graphite-700);
  border-radius: var(--radius-md);
  padding: 14px 18px;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  color: var(--ink-100);
}
.faq p {
  color: var(--ink-300);
  font-size: 13.5px;
  margin: 10px 0 0;
}

/* ------------------------------------------------------------------ */
/* Footer                                                              */
/* ------------------------------------------------------------------ */
.footer {
  border-top: 1px solid var(--graphite-700);
  background: var(--graphite-950);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px;
  text-align: center;
}
.footer .brand {
  margin-bottom: 8px;
}
.footer p {
  color: var(--ink-500);
  font-size: 12.5px;
  margin: 4px 0;
}
.footer-copy {
  color: var(--ink-500);
  opacity: 0.8;
}

/* ------------------------------------------------------------------ */
/* Responsive                                                          */
/* ------------------------------------------------------------------ */
@media (max-width: 800px) {
  .nav {
    display: none;
  }
  .strip-inner {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid, .grid-3 {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 28px;
  }
}