/* ==========================================================================
   Sened.AI — landing page
   Style : épuré, aéré, typographie soignée, palette restreinte.
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fb;
  --bg-soft-2: #f1f2f7;
  --ink: #0d1321;
  --ink-soft: #565f70;
  --ink-faint: #8890a0;
  --line: #e6e8ee;
  --line-soft: #eef0f4;

  --brand: #3656d6;
  --brand-ink: #24409c;
  --brand-soft: #edf0fc;

  --emerald: #0ea472;
  --emerald-soft: #e7f7f1;

  --violet: #7c4fe0;
  --violet-soft: #f1ecfc;

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;

  --shadow-sm: 0 1px 2px rgba(13, 19, 33, 0.04);
  --shadow: 0 8px 24px -8px rgba(13, 19, 33, 0.10);
  --shadow-lg: 0 24px 60px -20px rgba(13, 19, 33, 0.18);

  --container: 1160px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  /* Material Web Components theming — retint MD3's system tokens with our
     own palette/type/shape so md-outlined-* fields read as part of this
     site rather than stock Material. */
  --md-sys-color-primary: var(--brand);
  --md-sys-color-on-primary: #fff;
  --md-sys-color-outline: var(--line);
  --md-sys-color-outline-variant: var(--line);
  --md-sys-color-on-surface: var(--ink);
  --md-sys-color-on-surface-variant: var(--ink-soft);
  --md-sys-color-surface: #fff;
  --md-sys-color-surface-container: #fff;
  --md-sys-color-surface-container-highest: var(--bg-soft-2);
  --md-sys-color-secondary-container: var(--brand-soft);
  --md-sys-color-on-secondary-container: var(--brand-ink);
  --md-sys-color-error: #d64545;
  --md-ref-typeface-plain: "Inter", sans-serif;
  --md-ref-typeface-brand: "Inter", sans-serif;
  --md-sys-shape-corner-extra-small: var(--radius-sm);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

section { position: relative; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--brand);
  background: var(--brand-soft);
  padding: 6px 14px;
  border-radius: 999px;
}

h1, h2, h3, h4 { margin: 0; font-weight: 650; letter-spacing: -0.02em; }

h2.section-title {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.15;
  max-width: 640px;
}

p.section-sub {
  margin-top: 14px;
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 560px;
  line-height: 1.6;
}

.section-head {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-inline: auto;
  margin-bottom: 56px;
}
.section-head .section-title,
.section-head .section-sub { margin-inline: auto; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--ink);
  color: #fff;
}
.btn-primary:hover { background: #1c2436; transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-outline:hover { border-color: var(--ink); transform: translateY(-1px); }
.btn-light {
  background: #fff;
  color: var(--ink);
}
.btn-light:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-sm { height: 40px; padding: 0 18px; font-size: 14px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 2px 16px -8px rgba(13, 19, 33, 0.08);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16.5px;
  letter-spacing: -0.01em;
}
.brand .mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(155deg, var(--brand), #6d3ee0);
  display: grid;
  place-items: center;
}
.brand .mark svg { width: 16px; height: 16px; }

.main-nav { display: flex; align-items: center; gap: 36px; }
.main-nav a {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease);
}
.main-nav a:hover { color: var(--ink); }

.header-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 18px; height: 18px; }

/* ---------- Hero ---------- */
.hero {
  padding-top: clamp(56px, 9vw, 108px);
  padding-bottom: clamp(40px, 6vw, 72px);
  overflow: hidden;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero-copy h1 {
  margin-top: 20px;
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.06;
}
.hero-copy h1 .accent { color: var(--brand); }
.hero-copy p {
  margin-top: 22px;
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 480px;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 34px;
  flex-wrap: wrap;
}
.hero-note {
  margin-top: 22px;
  font-size: 13.5px;
  color: var(--ink-faint);
}

/* Hero visual — abstract product mockup, CSS-only */
.hero-visual { position: relative; }
.mock-frame {
  position: relative;
  background: linear-gradient(180deg, #fbfbfd, #f2f3f8);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-lg);
}
.mock-frame .mock-dots { display: flex; gap: 6px; margin-bottom: 16px; }
.mock-frame .mock-dots span {
  width: 9px; height: 9px; border-radius: 50%; background: var(--line);
}
.mock-panel {
  background: #fff;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 20px;
  display: grid;
  gap: 12px;
}
.mock-row { display: flex; gap: 12px; }
.mock-tile {
  flex: 1;
  border-radius: 12px;
  padding: 14px;
  min-height: 84px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.mock-tile.blue   { background: var(--brand-soft); }
.mock-tile.green  { background: var(--emerald-soft); }
.mock-tile.violet { background: var(--violet-soft); }
.mock-tile .dot { width: 20px; height: 20px; border-radius: 6px; }
.mock-tile.blue .dot   { background: var(--brand); }
.mock-tile.green .dot  { background: var(--emerald); }
.mock-tile.violet .dot { background: var(--violet); }
.mock-tile .bar { height: 6px; border-radius: 4px; background: rgba(13,19,33,0.10); }
.mock-tile .bar.w60 { width: 60%; }
.mock-tile .bar.w40 { width: 40%; }

.mock-list { display: grid; gap: 8px; margin-top: 4px; }
.mock-line { height: 9px; border-radius: 5px; background: var(--bg-soft-2); }
.mock-line.w90 { width: 90%; }
.mock-line.w70 { width: 70%; }
.mock-line.w50 { width: 50%; }

.float-card {
  position: absolute;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 600;
  animation: float 6s ease-in-out infinite;
}
.float-card .ico {
  width: 30px; height: 30px; border-radius: 9px;
  display: grid; place-items: center; flex: none;
}
.float-card .ico svg { width: 15px; height: 15px; }
.float-card small { display: block; font-weight: 500; color: var(--ink-faint); font-size: 11.5px; }

.float-1 { top: -18px; right: -8px; animation-delay: 0s; }
.float-2 { bottom: 8px; left: -30px; animation-delay: 1.2s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ---------- Trust strip ---------- */
.trust-strip {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 26px 0;
  background: var(--bg-soft);
}
.trust-strip ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 34px;
}
.trust-strip li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-soft);
}
.trust-strip li svg { width: 15px; height: 15px; color: var(--brand); flex: none; }

/* ---------- Features ---------- */
.features { padding-block: clamp(80px, 10vw, 132px); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  background: #fff;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.feature-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}
.feature-icon {
  width: 42px; height: 42px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
}
.feature-icon svg { width: 21px; height: 21px; }
.feature-card h3 { font-size: 17px; margin-bottom: 8px; }
.feature-card p { font-size: 14.5px; color: var(--ink-soft); line-height: 1.6; margin: 0; }

.tone-blue   .feature-icon { background: var(--brand-soft); color: var(--brand); }
.tone-green  .feature-icon { background: var(--emerald-soft); color: var(--emerald); }
.tone-violet .feature-icon { background: var(--violet-soft); color: var(--violet); }

/* ---------- How it works ---------- */
.how {
  padding-block: clamp(80px, 10vw, 132px);
  background: var(--bg-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  counter-reset: step;
}
.step { position: relative; padding-top: 8px; }
.step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-size: 13px;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: 0.02em;
}
.step h3 { margin-top: 12px; font-size: 18.5px; }
.step p { margin-top: 10px; font-size: 14.5px; color: var(--ink-soft); line-height: 1.65; }
.step-line {
  position: absolute;
  top: 0; left: -16px;
  width: 1px; height: 100%;
  background: var(--line);
}
.step:first-child .step-line { display: none; }

/* ---------- Spaces triptych ---------- */
.spaces { padding-block: clamp(80px, 10vw, 132px); }
.space-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.space-card {
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  color: #fff;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.space-card .space-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: rgba(255,255,255,0.16);
  display: grid;
  place-items: center;
  margin-bottom: 22px;
}
.space-card .space-icon svg { width: 22px; height: 22px; }
.space-card h3 { font-size: 20px; color: #fff; }
.space-card p.tag {
  margin-top: 4px;
  font-size: 13px;
  font-weight: 600;
  opacity: 0.75;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.space-card ul { margin-top: 20px; display: grid; gap: 10px; }
.space-card ul li {
  font-size: 14px;
  display: flex;
  align-items: flex-start;
  gap: 9px;
  opacity: 0.92;
  line-height: 1.5;
}
.space-card ul li svg { width: 16px; height: 16px; margin-top: 2px; flex: none; opacity: 0.85; }

.space-blue   { background: linear-gradient(160deg, #3656d6, #24409c); }
.space-green  { background: linear-gradient(160deg, #12b184, #0a7a58); }
.space-violet { background: linear-gradient(160deg, #8a5cf0, #5c34b8); }

/* ---------- CTA banner ---------- */
.cta-banner {
  margin: 0 24px clamp(80px, 10vw, 132px);
  max-width: calc(var(--container) - 0px);
  margin-inline: auto;
  border-radius: var(--radius-lg);
  background: var(--ink);
  padding: clamp(48px, 7vw, 72px);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(54,86,214,0.5), transparent 70%);
  pointer-events: none;
}
.cta-banner h2 {
  position: relative;
  color: #fff;
  font-size: clamp(26px, 3.4vw, 36px);
  max-width: 560px;
  margin-inline: auto;
  line-height: 1.2;
}
.cta-banner p {
  position: relative;
  margin-top: 14px;
  color: rgba(255,255,255,0.65);
  font-size: 16px;
}
.cta-banner .hero-actions { position: relative; justify-content: center; margin-top: 30px; }

/* ---------- Contact ---------- */
.contact { padding-block: clamp(80px, 10vw, 132px); }

.contact-panel {
  display: grid;
  grid-template-columns: 0.86fr 1.14fr;
  max-width: 980px;
  margin-inline: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.contact-info {
  padding: 48px 40px;
  background: linear-gradient(160deg, var(--ink), #1c2436);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 28px;
}
.contact-info h3 { font-size: 22px; line-height: 1.25; color: #fff; }
.contact-info > p { margin: 0; font-size: 14.5px; line-height: 1.65; color: rgba(255, 255, 255, 0.68); }

.contact-details { display: grid; gap: 16px; }
.contact-detail { display: flex; align-items: center; gap: 12px; font-size: 14px; font-weight: 600; }
.contact-detail .ico {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.12);
  display: grid;
  place-items: center;
  flex: none;
}
.contact-detail .ico svg { width: 16px; height: 16px; }
.contact-detail a:hover { text-decoration: underline; }

.contact-form {
  padding: 48px 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-content: start;
}
.form-field-full { grid-column: 1 / -1; }
.form-field { width: 100%; }
md-outlined-text-field[type="textarea"] { min-height: 104px; }

/* Honeypot field: off-screen for humans, still present in the DOM for bots */
.form-row-honeypot {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 6px;
}
.form-status { margin: 0; font-size: 13.5px; color: var(--ink-soft); }
.form-status[data-state="success"] { color: var(--emerald); }
.form-status[data-state="error"] { color: #d64545; }

@media (max-width: 760px) {
  .contact-panel { grid-template-columns: 1fr; max-width: 560px; }
  .contact-info,
  .contact-form { padding: 36px 32px; }
  .contact-form { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line-soft);
  padding: 56px 0 32px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand p {
  margin-top: 14px;
  font-size: 14px;
  color: var(--ink-soft);
  max-width: 260px;
  line-height: 1.6;
}
.footer-col h4 {
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  margin-bottom: 14px;
}
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { font-size: 14px; color: var(--ink-soft); transition: color 0.2s var(--ease); }
.footer-col a:hover { color: var(--ink); }
.footer-bottom {
  border-top: 1px solid var(--line-soft);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--ink-faint);
}

/* ---------- Reveal on scroll ----------
   Progressive enhancement: content is visible by default. Only once main.js
   confirms it's running does it add .js-reveal to <html>, which is what
   opts elements into the hidden-until-scrolled-into-view state. This way a
   JS failure never leaves the page permanently blank. */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Mobile nav ---------- */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 76px 0 0 0;
  z-index: 49;
  background: #fff;
  border-top: 1px solid var(--line);
  padding: 28px 24px;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}
.mobile-nav.is-open {
  display: block;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.mobile-nav ul { display: grid; gap: 4px; }
.mobile-nav a {
  display: block;
  padding: 14px 4px;
  font-size: 17px;
  font-weight: 600;
  border-bottom: 1px solid var(--line-soft);
}
.mobile-nav .btn { width: 100%; margin-top: 20px; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .main-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .header-actions .btn-outline.desktop-only { display: none; }
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .space-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { flex: 1; }
  .footer-top { grid-template-columns: 1fr; }
  .float-card { display: none; }
  .site-header .header-actions .btn-outline { display: none; }
}