/* ==========================================================================
   Sébastien Blanc — design system
   ========================================================================== */

:root {
  --bg: #0b1220;
  --bg-alt: #0e1730;
  --surface: #131d38;
  --surface-hover: #172244;
  --border: #223058;
  --text: #eef2f8;
  --text-dim: #9fb0c9;
  --accent: #f2b544;
  --accent-strong: #ffcf70;
  --accent-contrast: #1a1204;
  --success: #4ade80;
  --danger: #f87171;
  --shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.55);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --header-h: 72px;
  --container-w: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

:root[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-alt: #ffffff;
  --surface: #ffffff;
  --surface-hover: #f0f2f8;
  --border: #e3e7f0;
  --text: #10192e;
  --text-dim: #56637c;
  --accent: #c9860f;
  --accent-strong: #a86e0a;
  --accent-contrast: #ffffff;
  --shadow: 0 20px 40px -24px rgba(16, 25, 46, 0.25);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease);
}

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

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

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1, h2, h3, p {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 1000;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 12px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.25s var(--ease);
}

.site-header.is-scrolled {
  box-shadow: 0 12px 24px -18px rgba(0, 0, 0, 0.45);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent), var(--accent-strong));
  color: var(--accent-contrast);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.site-nav ul {
  position: relative;
  display: flex;
  gap: 28px;
}

.site-nav a {
  font-size: 0.94rem;
  color: var(--text-dim);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  transition: color 0.2s var(--ease);
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--text);
}

.nav-indicator {
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  border-radius: 2px;
  opacity: 0;
  transform: translateX(0);
  transition: transform 0.4s var(--ease), width 0.4s var(--ease), opacity 0.3s var(--ease);
  pointer-events: none;
}

.nav-indicator.is-snapping {
  transition: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text);
  transition: background-color 0.2s var(--ease);
}

.icon-btn:hover {
  background: var(--surface-hover);
}

.icon-moon,
:root[data-theme="light"] .icon-sun {
  display: none;
}

:root[data-theme="light"] .icon-moon {
  display: block;
}

.icon-close {
  display: none;
}

.nav-toggle {
  display: none;
}

/* ---------- Sections ---------- */

.hero,
.section {
  scroll-margin-top: var(--header-h);
}

.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-kicker {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.6rem, 2.6vw, 2.2rem);
  letter-spacing: -0.02em;
  margin-bottom: 44px;
}

.subsection-title {
  font-size: 1.05rem;
  margin-bottom: 16px;
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 72px 0 64px;
  overflow: clip;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 520px;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%);
  pointer-events: none;
  z-index: -1;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
  min-height: calc(100svh - var(--header-h) - 72px);
}

.kicker {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-text {
  color: var(--text-dim);
  font-size: 1.08rem;
  max-width: 52ch;
  margin-bottom: 28px;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-dim);
}

.badge-accent {
  color: var(--success);
  border-color: color-mix(in srgb, var(--success) 40%, var(--border));
  background: color-mix(in srgb, var(--success) 12%, var(--surface));
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: 0 10px 24px -10px color-mix(in srgb, var(--accent) 70%, transparent);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -10px color-mix(in srgb, var(--accent) 80%, transparent);
}

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

.btn-ghost:hover {
  background: var(--surface-hover);
  transform: translateY(-2px);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar-ring {
  width: min(320px, 60vw);
  aspect-ratio: 1;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(155deg, var(--surface), var(--bg-alt));
  border: 1px solid var(--border);
  box-shadow: var(--shadow), inset 0 0 0 10px color-mix(in srgb, var(--accent) 8%, transparent);
  position: relative;
}

.avatar-ring::before {
  content: "";
  position: absolute;
  inset: -14px;
  border-radius: 50%;
  border: 1px dashed color-mix(in srgb, var(--accent) 45%, transparent);
  animation: spin 40s linear infinite;
}

.avatar-mark {
  font-size: clamp(3.4rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(155deg, var(--accent), var(--accent-strong));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  color: var(--text-dim);
  display: inline-flex;
  animation: bob 2.4s ease-in-out infinite;
}

@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 6px); }
}

/* ---------- Grids & cards ---------- */

.grid {
  display: grid;
  gap: 24px;
}

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

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  box-shadow: var(--shadow);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--accent) 14%, var(--surface));
  color: var(--accent);
  margin-bottom: 18px;
}

.card h3 {
  font-size: 1.08rem;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-dim);
  font-size: 0.96rem;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
}

.card-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- Profile lower (skills / certifications) ---------- */

.profile-lower {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  margin-top: 56px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text);
}

.chip-list-sm .chip {
  padding: 5px 12px;
  font-size: 0.76rem;
  color: var(--text-dim);
}

.cert-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cert-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.cert-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 14%, var(--surface));
  color: var(--accent);
  flex-shrink: 0;
}

.cert-item strong {
  display: block;
  font-size: 0.95rem;
}

.cert-text {
  color: var(--text-dim);
  font-size: 0.86rem;
}

/* ---------- Timeline ---------- */

.timeline {
  position: relative;
  max-width: 780px;
  margin-inline: auto;
  padding-left: 32px;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.timeline-item {
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: -37.5px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 2px solid var(--text-dim);
}

.timeline-dot.is-current {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 20%, transparent);
}

.timeline-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 4px;
}

.timeline-head h3 {
  font-size: 1.12rem;
}

.timeline-period {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.timeline-org {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 12px;
}

.timeline-bullets {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline-bullets li {
  color: var(--text-dim);
  font-size: 0.94rem;
  padding-left: 18px;
  position: relative;
}

.timeline-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.formation-block {
  max-width: 780px;
  margin: 56px auto 0;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.contact-line {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-dim);
  font-weight: 500;
  transition: color 0.2s var(--ease);
}

a.contact-line:hover {
  color: var(--accent);
}

.contact-line .icon {
  color: var(--accent);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-row label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-dim);
}

.form-row input,
.form-row textarea {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  font: inherit;
  resize: vertical;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.form-row input:focus,
.form-row textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-notice {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-notice-success {
  background: color-mix(in srgb, var(--success) 16%, transparent);
  color: var(--success);
}

.form-notice-error {
  background: color-mix(in srgb, var(--danger) 16%, transparent);
  color: var(--danger);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding-top: 48px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding-bottom: 32px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-name {
  font-weight: 700;
}

.footer-tagline {
  color: var(--text-dim);
  font-size: 0.86rem;
  margin-top: 2px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-block: 20px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ---------- Pages légales ---------- */

.legal-page .prose {
  max-width: 720px;
}

.legal-page h1 {
  margin-bottom: 40px;
}

.prose h2 {
  font-size: 1.15rem;
  margin-top: 36px;
  margin-bottom: 12px;
}

.prose p {
  color: var(--text-dim);
  margin-bottom: 4px;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- Reveal on scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal.in-view {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .avatar-ring::before,
  .scroll-cue {
    animation: none;
  }
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    min-height: auto;
    text-align: center;
  }

  .hero-copy {
    order: 2;
  }

  .hero-visual {
    order: 1;
  }

  .avatar-ring {
    width: 200px;
    margin-inline: auto;
  }

  .badge-row,
  .hero-actions {
    justify-content: center;
  }

  .hero-text {
    margin-inline: auto;
  }

  .grid-3,
  .grid-2,
  .profile-lower,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--bg);
    padding: 32px 24px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }

  .site-nav.is-open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 6px;
  }

  .site-nav a {
    display: block;
    padding: 14px 4px;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-indicator {
    display: none;
  }

  .nav-toggle[aria-expanded="true"] .icon-menu {
    display: none;
  }

  .nav-toggle[aria-expanded="true"] .icon-close {
    display: block;
  }

  .section {
    padding: 64px 0;
  }
}

@media (max-width: 520px) {
  .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .timeline {
    padding-left: 24px;
  }

  .timeline-dot {
    left: -29.5px;
  }
}