/* ==========================================================================
   Alexandre Vial — Portfolio
   Style éditorial sobre : crème, serif d'apparat, une couleur d'accent.
   Sections :
     1. Design tokens        6. Hero
     2. Base & reset         7. Services
     3. Utilities            8. Projets
     4. Buttons              9. Compétences
     5. Header              10. Parcours
                            11. Contact & footer
                            12. Reveals / responsive / reduced motion
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */
:root {
  /* Palette — base crème chaude, accents bleus */
  --bg-primary: #FAF9F5;          /* Ivoire chaud */
  --bg-secondary: #F1EFEA;        /* Crème */
  --surface: #FFFFFF;
  --text-primary: #191919;        /* Charbon */
  --text-secondary: #5C5852;      /* Argile */
  --accent-blue: #2563EB;         /* Bleu lien / focus */
  --accent-pastel-blue: #DBF3FA;  /* Bleu pastel */
  --accent-slate: #1C3E4A;        /* Bleu ardoise (boutons, titres) */
  --accent-amber: #B97D00;        /* Ambre (statut en cours) */
  --success: #256C45;             /* Vert (disponibilité, production) */
  --success-bg: #E5F1E9;
  --border-color: #E5E3DC;
  --danger: #B3261E;

  /* Surfaces sombres (section contact) */
  --panel-dark: #16333E;
  --panel-darker: #0E2530;
  --on-dark: #F4F1EA;
  --on-dark-muted: rgba(244, 241, 234, 0.66);
  --on-dark-border: rgba(244, 241, 234, 0.18);

  /* Fontes */
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Layout */
  --header-height: 72px;
  --max-width: 1160px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --radius-card: 14px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 18px 40px rgba(28, 62, 74, 0.08);
  --shadow-card-hover: 0 26px 52px rgba(28, 62, 74, 0.13);
}

/* --------------------------------------------------------------------------
   2. Base & reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

::selection {
  background: var(--accent-pastel-blue);
}

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

/* --------------------------------------------------------------------------
   3. Utilities
   -------------------------------------------------------------------------- */
.mono { font-family: var(--font-mono); }
.font-serif { font-family: var(--font-serif); }

.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;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  padding: 0.6rem 1.2rem;
  background: var(--accent-slate);
  color: var(--bg-primary);
  border-radius: 999px;
  font-size: 0.85rem;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.2s var(--ease-out);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Anti-spam : champ caché aux humains (honeypot) */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

/* --------------------------------------------------------------------------
   4. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s var(--ease-out), color 0.2s var(--ease-out),
              border-color 0.2s var(--ease-out), transform 0.2s var(--ease-out),
              box-shadow 0.2s var(--ease-out);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent-slate);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: var(--panel-darker);
  box-shadow: 0 10px 24px rgba(28, 62, 74, 0.22);
}

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

.btn-secondary:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
}

.btn-block {
  width: 100%;
}

.btn[disabled] {
  opacity: 0.6;
  cursor: wait;
}

/* --------------------------------------------------------------------------
   5. Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 2rem;
  height: var(--header-height);
  padding: 0 var(--gutter);
  /* ponytail: fond opaque plutôt qu'un backdrop-filter blur — le flou se
     recalcule à chaque frame de scroll et fait chuter le framerate sur GPU
     intégré. Le header reste net et lisible sans coût GPU par frame. */
  background: var(--bg-primary);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.site-header.scrolled {
  border-bottom-color: var(--border-color);
  box-shadow: 0 6px 24px rgba(28, 62, 74, 0.05);
}

.header-name {
  font-size: 1.25rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.header-nav {
  display: flex;
  gap: 1.75rem;
  margin-left: auto;
}

.header-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s var(--ease-out);
}

.header-nav a:hover {
  color: var(--text-primary);
}

.btn-header {
  padding: 0.6rem 1.3rem;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   6. Hero
   -------------------------------------------------------------------------- */
.hero {
  padding: clamp(4.5rem, 10vw, 8rem) 0 clamp(3.5rem, 7vw, 6rem);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 1rem;
  background: var(--success-bg);
  border: 1px solid rgba(37, 108, 69, 0.25);
  border-radius: 999px;
  color: var(--success);
  font-size: 0.88rem;
  font-weight: 500;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  flex-shrink: 0;
}

.status-dot.testing {
  background: var(--accent-amber);
}

.hero h1 {
  margin-top: 1.5rem;
  max-width: 30ch;
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.015em;
}

.hero-lead {
  margin-top: 1.5rem;
  max-width: 58ch;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  font-weight: 300;
  color: var(--text-secondary);
}

.hero-sub {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-top: 1.15rem;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-slate);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2.25rem;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-color);
}

.fact dt {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.fact dd {
  margin-top: 0.35rem;
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Sections communes
   -------------------------------------------------------------------------- */
.section {
  padding: clamp(3.5rem, 8vw, 6.5rem) 0;
}

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

.section-header {
  max-width: 640px;
  margin-bottom: clamp(2.25rem, 5vw, 3.5rem);
}

.section-tag {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-slate);
}

.section-header h2,
.contact-intro h2 {
  margin-top: 0.75rem;
  font-size: clamp(1.85rem, 3.6vw, 2.6rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.section-desc {
  margin-top: 0.9rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   7. Services
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.service-card {
  padding: 1.85rem;
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.service-card h3 {
  font-size: 1.08rem;
  font-weight: 600;
}

.service-card p {
  margin-top: 0.7rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   8. Projets
   -------------------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: 1.85rem;
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.project-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.project-domain {
  color: var(--text-secondary);
}

.project-status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--success);
  white-space: nowrap;
}

.project-status:has(.testing) {
  color: var(--accent-amber);
}

.project-card h3 {
  margin-top: 1.15rem;
  font-size: 1.6rem;
  font-weight: 600;
}

.project-tagline {
  margin-top: 0.3rem;
  font-weight: 500;
}

.project-desc {
  margin-top: 0.75rem;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.project-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: auto;
  padding-top: 1.4rem;
}

.result dt {
  font-size: 0.7rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.result dd {
  margin-top: 0.2rem;
  font-size: 1.45rem;
  font-weight: 600;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.25rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--border-color);
  list-style: none;
}

.tag-list li {
  padding: 0.28rem 0.7rem;
  background: var(--bg-secondary);
  border-radius: 999px;
  font-size: 0.74rem;
  letter-spacing: 0.03em;
}

.section-alt .tag-list li {
  background: var(--bg-primary);
}

/* --------------------------------------------------------------------------
   9. Compétences
   -------------------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem;
}

.skill-group h3 {
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--text-primary);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.skill-group ul {
  list-style: none;
}

.skill-group li {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   10. Parcours
   -------------------------------------------------------------------------- */
.timeline {
  max-width: 760px;
  list-style: none;
}

.timeline-item {
  position: relative;
  padding: 0 0 2.25rem 2rem;
  border-left: 2px solid #D8D4C9;
}

.timeline-item:last-child {
  padding-bottom: 0.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  top: 0.4rem;
  left: -5.5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-slate);
  border: 2px solid var(--bg-secondary);
}

.timeline-date {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.timeline-item h3 {
  margin-top: 0.4rem;
  font-size: 1.1rem;
  font-weight: 600;
}

.timeline-place {
  margin-left: 0.5rem;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.timeline-item p:last-child {
  margin-top: 0.45rem;
  max-width: 62ch;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.aside-note {
  max-width: 56ch;
  margin-top: clamp(2.25rem, 5vw, 3.25rem);
  padding-left: 1.5rem;
  border-left: 3px solid var(--accent-slate);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.08rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   11. Contact & footer
   -------------------------------------------------------------------------- */
.contact-section {
  background: linear-gradient(180deg, var(--panel-dark) 0%, var(--panel-darker) 100%);
  color: var(--on-dark);
}

.contact-section :focus-visible {
  outline-color: var(--accent-pastel-blue);
}

.contact-section ::selection {
  background: var(--accent-slate);
  color: var(--on-dark);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
}

.contact-intro .section-tag {
  color: var(--accent-pastel-blue);
}

.contact-intro .section-desc {
  color: var(--on-dark-muted);
  max-width: 46ch;
}

.contact-channels {
  margin-top: 2.25rem;
  list-style: none;
}

.contact-channels li {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--on-dark-border);
}

.contact-channels li:first-child {
  border-top: 1px solid var(--on-dark-border);
}

.channel-label {
  flex-shrink: 0;
  width: 5.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--on-dark-muted);
}

.contact-channels a {
  color: var(--on-dark);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease-out);
  overflow-wrap: anywhere;
}

.contact-channels a:hover {
  border-bottom-color: var(--accent-pastel-blue);
}

/* Formulaire sur fond sombre */
.contact-form .form-group {
  margin-bottom: 1.15rem;
}

.contact-form label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--on-dark-muted);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  background: rgba(244, 241, 234, 0.07);
  border: 1px solid var(--on-dark-border);
  border-radius: 10px;
  color: var(--on-dark);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color 0.2s var(--ease-out), background-color 0.2s var(--ease-out);
}

.contact-form textarea {
  resize: vertical;
  min-height: 8rem;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(244, 241, 234, 0.4);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent-pastel-blue);
  background: rgba(244, 241, 234, 0.11);
}

/* Bouton inversé sur fond sombre */
.contact-form .btn-primary {
  margin-top: 0.35rem;
  background: var(--on-dark);
  color: var(--panel-darker);
}

.contact-form .btn-primary:hover {
  background: #FFFFFF;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
}

.form-status {
  margin-top: 0.9rem;
  font-size: 0.82rem;
  color: var(--accent-pastel-blue);
}

.form-status.error {
  color: #F2B8B5;
}

/* Footer (dans la section sombre) */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  margin-top: clamp(3rem, 7vw, 5rem);
  padding-top: 1.75rem;
  border-top: 1px solid var(--on-dark-border);
  font-size: 0.85rem;
  color: var(--on-dark-muted);
}

/* --------------------------------------------------------------------------
   12. Reveals, responsive, reduced motion
   -------------------------------------------------------------------------- */
/* Masqué uniquement si JS est actif (classe .js posée dans <head>) */
.js .reveal-up {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  transition-delay: var(--delay, 0s);
}

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

@media (max-width: 960px) {
  .services-grid,
  .projects-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
  }

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

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

@media (max-width: 720px) {
  .header-nav {
    display: none;
  }

  .hero h1 br {
    display: none;
  }

  .site-header {
    justify-content: space-between;
  }

  .hero-facts {
    grid-template-columns: 1fr;
    gap: 1.1rem;
  }
}

@media (max-width: 480px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .js .reveal-up {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .service-card,
  .project-card {
    transition: none;
  }
}