/* Tendencify — Site public (landing + blog).
   Reprend les tokens du "Tendencify Design System" (claude.ai/design) :
   theme sombre, accent indigo-violet OKLCH, typo Inter, boutons outline+glow. */

:root {
  color-scheme: dark;

  --bg: #161826;
  --surface: #20233a;
  --surface-2: #262a44;
  --border: rgba(233, 233, 237, 0.1);
  --border-strong: rgba(233, 233, 237, 0.2);

  --ink: #e9e9ed;
  --muted: #a7a8bb;
  --muted-2: #6f7086;

  --primary: oklch(60% 0.075 265);
  --primary-strong: oklch(58% 0.13 265);
  --primary-ink: #e9e9ed;
  --accent: oklch(46% 0.19 266);
  --accent-glow: oklch(70% 0.1 265 / 0.35);
  --error: oklch(0.55 0.19 25);

  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: var(--font-sans);
  --font-display: var(--font-sans);

  --text-sm: 0.8125rem;
  --text-base: 1rem;
  --text-md: 1.125rem;
  --text-lg: 1.75rem;
  --text-xl: 2.5rem;
  --text-display: 3.5rem;

  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs: 0.75rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --radius-sm: 6px;
  --radius-md: 8px;

  --shadow-card: 0 1px 0 0 rgba(255, 255, 255, 0.04) inset, 0 16px 32px -20px rgba(0, 0, 0, 0.6),
    0 0 0 1px var(--border);
  --shadow-glow-cta: 0 0 0 1px var(--primary-strong), 0 0 24px 2px var(--accent-glow);

  --ease-out-expo: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur-base: 220ms;

  --max-w: 68rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: oklch(60% 0.075 265 / 0.35);
  color: var(--ink);
}

.mono {
  font-family: var(--font-mono);
}

a {
  color: inherit;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--text-display);
}

h2 {
  font-size: var(--text-xl);
}

h3 {
  font-size: var(--text-md);
  font-weight: 500;
  font-family: var(--font-sans);
}

p {
  margin: 0 0 var(--space-sm);
  color: var(--muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3xs);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--primary);
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: var(--space-3xs) var(--space-xs);
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur-base) var(--ease-out-expo), background var(--dur-base) var(--ease-out-expo),
    box-shadow var(--dur-base) var(--ease-out-expo), color var(--dur-base) var(--ease-out-expo);
  white-space: nowrap;
}

.btn-primary {
  background: color-mix(in oklab, var(--primary-strong) 14%, var(--bg));
  color: var(--primary-ink);
  border: 1px solid var(--primary-strong);
  box-shadow: var(--shadow-glow-cta);
}

.btn-primary:hover {
  border-color: var(--primary);
  background: color-mix(in oklab, var(--primary-strong) 24%, var(--bg));
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--border-strong);
}

.btn-ghost:hover {
  border-color: var(--primary);
}

/* Header */

.lp-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  backdrop-filter: blur(10px);
  z-index: 10;
}

/* Background grid + glow, cf. ui_kits/landing/BackgroundGrid.jsx du design system */

.lp-bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.lp-bg-grid-lines {
  position: absolute;
  left: 0;
  right: 0;
  top: -20%;
  height: 140%;
  background-image: linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 55% 60% at 50% 42%, black 0%, transparent 70%);
  mask-image: radial-gradient(ellipse 55% 60% at 50% 42%, black 0%, transparent 70%);
}

.lp-bg-grid-glow {
  position: absolute;
  left: 50%;
  top: 38%;
  width: 900px;
  height: 900px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, var(--accent-glow), transparent 65%);
}

main,
.lp-footer {
  position: relative;
  z-index: 1;
}

.lp-header-inner {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.lp-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.lp-nav-cta {
  display: none;
}

.lp-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.lp-nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform var(--dur-base) var(--ease-out-expo), opacity var(--dur-base) var(--ease-out-expo);
}

.lp-nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.lp-nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.lp-nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.lp-brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-2xs);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  margin-right: auto;
}

.lp-brand strong {
  font-size: var(--text-md);
  font-family: var(--font-sans);
  font-weight: 700;
}

.lp-brand span {
  color: var(--muted-2);
}

.lp-logo {
  align-self: center;
  display: block;
}

.lp-nav {
  display: flex;
  gap: var(--space-md);
}

.lp-nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: var(--text-sm);
  transition: color var(--dur-base) var(--ease-out-expo);
}

.lp-nav a:hover {
  color: var(--ink);
}

/* Hero */

.lp-hero {
  padding: var(--space-2xl) var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--border);
}

.lp-hero-inner {
  max-width: 46rem;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.lp-hero h1 {
  margin-top: var(--space-xs);
}

.lp-hero-rotate-line {
  display: block;
}

.lp-rotator {
  position: relative;
  display: inline-block;
  min-width: 16ch;
  height: 1.2em;
  overflow: hidden;
  vertical-align: bottom;
  text-align: center;
  font-weight: 700;
}

.lp-rotator span {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(0.6em);
  animation: lp-rotate-word 10s infinite;
  background: linear-gradient(135deg, #29eac4, #4284db);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lp-rotator span:nth-child(1) { animation-delay: 0s; }
.lp-rotator span:nth-child(2) { animation-delay: -2s; }
.lp-rotator span:nth-child(3) { animation-delay: -4s; }
.lp-rotator span:nth-child(4) { animation-delay: -6s; }
.lp-rotator span:nth-child(5) { animation-delay: -8s; }

@keyframes lp-rotate-word {
  0% { opacity: 0; transform: translateY(0.6em); }
  4% { opacity: 1; transform: translateY(0); }
  16% { opacity: 1; transform: translateY(0); }
  20% { opacity: 0; transform: translateY(-0.6em); }
  100% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .lp-rotator span {
    animation: none;
    opacity: 0;
  }
  .lp-rotator span:first-child {
    opacity: 1;
    position: static;
  }
}

.lp-lead {
  font-size: var(--text-md);
  color: var(--muted);
  max-width: 38rem;
}

.lp-cta-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

/* Sections */

.lp-section {
  padding: var(--space-2xl) var(--space-md);
}

.lp-section-alt {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.lp-section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.lp-section h2 {
  margin-bottom: var(--space-lg);
  max-width: 32rem;
}

.lp-section p {
  max-width: 42rem;
  font-size: var(--text-md);
}

/* Steps */

.lp-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.lp-steps li {
  padding-top: var(--space-sm);
  border-top: 2px solid var(--primary);
}

.lp-steps h3 {
  margin-bottom: var(--space-2xs);
}

.lp-steps p {
  font-size: var(--text-sm);
}

/* Feature grid */

.lp-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.lp-feature-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: var(--space-md);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur-base) var(--ease-out-expo);
}

.lp-feature-card:hover {
  border-color: var(--border-strong);
}

.lp-feature-card h3 {
  margin-bottom: var(--space-2xs);
}

.lp-feature-card p {
  font-size: var(--text-sm);
  margin-bottom: 0;
}

/* Audience */

.lp-audience {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm) var(--space-lg);
  max-width: 42rem;
}

.lp-audience li {
  padding-left: var(--space-md);
  position: relative;
  color: var(--muted);
  font-size: var(--text-md);
}

.lp-audience li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

/* FAQ */

.lp-faq {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: 42rem;
}

.lp-faq-item h3 {
  margin-bottom: var(--space-2xs);
}

.lp-faq-item p {
  margin-bottom: 0;
  font-size: var(--text-sm);
}

/* Final CTA */

.lp-final-cta {
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
}

.lp-final-cta h2 {
  max-width: 34rem;
  margin: 0 auto var(--space-lg);
}

/* Footer */

.lp-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-md);
}

.lp-footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.lp-footer-top {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--muted-2);
  font-size: var(--text-sm);
}

.lp-footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
}

.lp-footer-brand .lp-logo {
  display: block;
}

.lp-lang-switch {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: var(--text-sm);
}

.lp-lang-switch a {
  color: var(--muted-2);
  text-decoration: none;
  transition: color var(--dur-base) var(--ease-out-expo);
}

.lp-lang-switch a:hover {
  color: var(--primary);
}

.lp-lang-current {
  color: var(--ink);
  font-weight: 600;
}

/* Blog */

.lp-blog-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-md);
}

.lp-blog-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: var(--space-md);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur-base) var(--ease-out-expo);
}

.lp-blog-card:hover {
  border-color: var(--border-strong);
}

.lp-blog-card h2 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2xs);
}

.lp-blog-card a {
  text-decoration: none;
}

.lp-blog-card a:hover h2 {
  color: var(--primary);
}

.lp-blog-empty {
  color: var(--muted-2);
  font-size: var(--text-md);
}

/* Article */

.lp-article {
  max-width: 42rem;
}

.lp-article h1 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-lg);
}

.lp-article h2 {
  max-width: none;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  font-size: var(--text-lg);
}

.lp-article h3 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-2xs);
}

.lp-article p {
  max-width: none;
}

.lp-blog-back {
  display: inline-block;
  margin-bottom: var(--space-lg);
  color: var(--muted);
  text-decoration: none;
  font-size: var(--text-sm);
}

.lp-blog-back:hover {
  color: var(--primary);
}

.lp-blog-cta {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  justify-content: space-between;
  box-shadow: var(--shadow-card);
}

.lp-blog-cta p {
  margin: 0;
  flex: 1 1 20rem;
}

/* Waitlist */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.lp-waitlist {
  max-width: 34rem;
  text-align: center;
}

.lp-waitlist h2 {
  margin: 0 auto var(--space-sm);
}

.lp-waitlist > p {
  margin-left: auto;
  margin-right: auto;
}

.lp-waitlist-form {
  display: flex;
  gap: var(--space-2xs);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--space-md);
}

.lp-waitlist-form input[type="email"] {
  flex: 1 1 16rem;
  max-width: 22rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
}

.lp-waitlist-form input[type="email"]:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

.lp-waitlist-message {
  min-height: 1.5em;
  margin: var(--space-sm) 0 0;
  font-size: var(--text-sm);
  color: var(--muted-2);
}

.lp-waitlist-message[data-state="success"] {
  color: var(--primary);
}

.lp-waitlist-message[data-state="error"] {
  color: var(--error);
}

@media (max-width: 860px) {
  .lp-steps,
  .lp-feature-grid {
    grid-template-columns: 1fr 1fr;
  }
  .lp-audience {
    grid-template-columns: 1fr;
  }
  .lp-nav-toggle {
    display: flex;
  }
  .lp-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: var(--space-sm);
    padding: 0 var(--space-md);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    background: var(--bg);
    border-bottom: 1px solid transparent;
    transition: max-height var(--dur-base) var(--ease-out-expo),
      opacity var(--dur-base) var(--ease-out-expo),
      padding var(--dur-base) var(--ease-out-expo);
  }
  .lp-nav.is-open {
    max-height: 20rem;
    opacity: 1;
    padding: var(--space-md);
    border-bottom-color: var(--border);
  }
  .lp-nav a {
    font-size: var(--text-base);
  }
  .lp-header-actions .btn-primary {
    display: none;
  }
  .lp-nav-cta {
    display: inline-flex;
    justify-content: center;
    text-align: center;
    margin-top: var(--space-2xs);
  }
}

@media (max-width: 560px) {
  .lp-steps,
  .lp-feature-grid {
    grid-template-columns: 1fr;
  }
  h1 {
    font-size: 2.5rem;
  }
}