/* ============================================================
   Pierre Ailliot — site personnel
   Design system Material 3, palette dérivée d'une graine
   "océan profond" (#00677E) — écho aux thèmes de recherche
   (vent, vagues, pluie, séries temporelles).
   ============================================================ */

   :root {
    color-scheme: light;
  
    /* --- Material 3 — schéma clair --- */
    --md-sys-color-primary: #00677e;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #bbe9ff;
    --md-sys-color-on-primary-container: #001f28;
  
    --md-sys-color-secondary: #4c626a;
    --md-sys-color-on-secondary: #ffffff;
    --md-sys-color-secondary-container: #cfe6f0;
    --md-sys-color-on-secondary-container: #071e25;
  
    --md-sys-color-tertiary: #5a5d7e;
    --md-sys-color-on-tertiary: #ffffff;
    --md-sys-color-tertiary-container: #e1e0ff;
    --md-sys-color-on-tertiary-container: #171a37;
  
    --md-sys-color-error: #ba1a1a;
    --md-sys-color-on-error: #ffffff;
    --md-sys-color-error-container: #ffdad6;
    --md-sys-color-on-error-container: #410002;
  
    --md-sys-color-background: #f5fafc;
    --md-sys-color-on-background: #171c1e;
    --md-sys-color-surface: #f5fafc;
    --md-sys-color-on-surface: #171c1e;
    --md-sys-color-surface-variant: #dae4e8;
    --md-sys-color-on-surface-variant: #3f484c;
  
    --md-sys-color-outline: #6f797c;
    --md-sys-color-outline-variant: #bec8cc;
  
    --md-sys-color-surface-container-lowest: #ffffff;
    --md-sys-color-surface-container-low: #dddddd;
    --md-sys-color-surface-container: #e9eff1;
    --md-sys-color-surface-container-high: #e3e9ec;
    --md-sys-color-surface-container-highest: #dde4e6;
  
    --md-sys-shape-corner-small: 8px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-large: 16px;
    --md-sys-shape-corner-extra-large: 28px;
  
    --elevation-1: 0 1px 2px rgba(0, 30, 40, 0.3), 0 1px 3px 1px rgba(0, 30, 40, 0.15);
    --elevation-2: 0 1px 2px rgba(0, 30, 40, 0.3), 0 2px 6px 2px rgba(0, 30, 40, 0.15);
    --elevation-3: 0 1px 3px rgba(0, 30, 40, 0.3), 0 4px 8px 3px rgba(0, 30, 40, 0.15);
  
    --font-display: "Roboto Flex", "Roboto", sans-serif;
    --font-body: "Roboto", sans-serif;
  }
  
  [data-theme="dark"] {
    color-scheme: dark;
  
    --md-sys-color-primary: #82d3f2;
    --md-sys-color-on-primary: #00363f;
    --md-sys-color-primary-container: #004e5c;
    --md-sys-color-on-primary-container: #bbe9ff;
  
    --md-sys-color-secondary: #b3cad3;
    --md-sys-color-on-secondary: #1e343b;
    --md-sys-color-secondary-container: #354a52;
    --md-sys-color-on-secondary-container: #cfe6f0;
  
    --md-sys-color-tertiary: #c3c3ea;
    --md-sys-color-on-tertiary: #2c2f4d;
    --md-sys-color-tertiary-container: #424564;
    --md-sys-color-on-tertiary-container: #e1e0ff;
  
    --md-sys-color-error: #ffb4ab;
    --md-sys-color-on-error: #690005;
    --md-sys-color-error-container: #93000a;
    --md-sys-color-on-error-container: #ffdad6;
  
    --md-sys-color-background: #0e1416;
    --md-sys-color-on-background: #dee3e5;
    --md-sys-color-surface: #0e1416;
    --md-sys-color-on-surface: #dee3e5;
    --md-sys-color-surface-variant: #3f484c;
    --md-sys-color-on-surface-variant: #bec8cc;
  
    --md-sys-color-outline: #899297;
    --md-sys-color-outline-variant: #3f484c;
  
    --md-sys-color-surface-container-lowest: #090f11;
    --md-sys-color-surface-container-low: #171c1e;
    --md-sys-color-surface-container: #1b2022;
    --md-sys-color-surface-container-high: #252b2d;
    --md-sys-color-surface-container-highest: #303638;
  
    --elevation-1: 0 1px 2px rgba(0, 0, 0, 0.5), 0 1px 3px 1px rgba(0, 0, 0, 0.3);
    --elevation-2: 0 1px 2px rgba(0, 0, 0, 0.5), 0 2px 6px 2px rgba(0, 0, 0, 0.3);
    --elevation-3: 0 1px 3px rgba(0, 0, 0, 0.5), 0 4px 8px 3px rgba(0, 0, 0, 0.3);
  }
  
  * { box-sizing: border-box; }
  
  html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
  
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  }
  
  body {
    margin: 0;
    font-family: var(--font-body);
    background: var(--md-sys-color-background);
    color: var(--md-sys-color-on-background);
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
  }
  
  a { color: var(--md-sys-color-primary); }
  
  .skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    padding: 10px 16px;
    border-radius: 0 0 8px 0;
    z-index: 100;
  }
  .skip-link:focus { left: 0; }
  
  :focus-visible {
    outline: 3px solid var(--md-sys-color-primary);
    outline-offset: 2px;
    border-radius: 4px;
  }
  
  /* ---------- Top app bar ---------- */
  .topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    background: color-mix(in srgb, var(--md-sys-color-surface-container-low) 92%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
  }
  
  .topbar__inner {
    max-width: 1040px;
    margin: 0 auto;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 20px;
  }
  
  .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: inherit;
    margin-right: auto;
  }
  
  .brand__mark {
    width: 40px;
    height: 40px;
    border-radius: var(--md-sys-shape-corner-medium);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    display: grid;
    place-items: center;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    flex-shrink: 0;
  }
  
  .brand__text {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.05rem;
    line-height: 1.15;
  }
  .brand__text small {
    display: block;
    font-weight: 400;
    font-size: 0.72rem;
    color: var(--md-sys-color-on-surface-variant);
  }
  
  .tabs {
    display: flex;
    gap: 2px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .tabs::-webkit-scrollbar { display: none; }
  
  .tab {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--md-sys-shape-corner-extra-large);
    text-decoration: none;
    color: var(--md-sys-color-on-surface-variant);
    font-weight: 500;
    font-size: 0.9rem;
    white-space: nowrap;
    transition: background-color 0.2s ease, color 0.2s ease;
  }
  .tab:hover { background: color-mix(in srgb, var(--md-sys-color-primary) 8%, transparent); }
  .tab .md-icon-wrap { font-size: 1.2rem; }
  .tab[aria-current="page"] {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    font-weight: 700;
  }
  
  /* ---------- Layout ---------- */
  main {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 20px 80px;
  }
  
  .section {
    padding-top: 48px;
  }
  
  .eyebrow {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--md-sys-color-primary);
    margin: 0 0 8px;
  }
  
  .section h2 {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 1.1rem + 1vw, 1.8rem);
    font-weight: 700;
    margin: 0 0 20px;
    display: flex;
    align-items: center;
    gap: 10px;
  }
  
  /* ---------- Hero ---------- */
  .hero {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 40px;
    align-items: center;
    padding: 56px 0 32px;
  }
  
  .hero__portrait {
    width: 220px;
    height: 220px;
    border-radius: var(--md-sys-shape-corner-extra-large);
    overflow: hidden;
    background: var(--md-sys-color-surface-container-high);
    box-shadow: var(--elevation-2);
    display: grid;
    place-items: center;
    flex-shrink: 0;
  }
  .hero__portrait img { width: 100%; height: 100%; object-fit: cover; display: block; }
  .hero__portrait .placeholder-icon { font-size: 4rem; color: var(--md-sys-color-outline); }
  
  .hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 1.7rem + 2vw, 3.2rem);
    font-weight: 700;
    margin: 0 0 6px;
    line-height: 1.05;
  }
  
  .hero__subtitle {
    font-size: 1.1rem;
    color: var(--md-sys-color-on-surface-variant);
    margin: 0;
  }
  
  .hero-page {
    padding: 48px 0 8px;
  }
  .hero-page h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 1.6rem + 1.5vw, 2.7rem);
    font-weight: 700;
    margin: 0;
  }
  
  /* wave signature divider */
  .wave-divider {
    width: 100%;
    height: 48px;
    margin: 16px 0 0;
    overflow: hidden;
    line-height: 0;
  }
  .wave-divider svg { width: 200%; height: 48px; animation: drift 28s linear infinite; }
  @media (prefers-reduced-motion: reduce) { .wave-divider svg { animation: none; } }
  @keyframes drift { from { transform: translateX(0); } to { transform: translateX(-50%); } }
  
  /* ---------- Cards ---------- */
  .card {
    background: var(--md-sys-color-surface-container-low);
    /* border: 1px solid var(--md-sys-color-outline-variant); */
    border-radius: var(--md-sys-shape-corner-large);
    padding: 28px;
    /* box-shadow: var(--elevation-1); */
  }
  
  .card + .card { margin-top: 24px; }
  
  .two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  
  .theme-card h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 1.15rem;
    margin: 0 0 14px;
    color: var(--md-sys-color-primary);
  }
  
  .theme-card ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .theme-card li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.95rem;
  }
  .theme-card li .md-icon-wrap { color: var(--md-sys-color-secondary); font-size: 1.1rem; margin-top: 1px; }
  
  /* ---------- Contact list ---------- */
  md-list {
    --md-list-container-color: transparent;
    background: transparent;
  }
  
  /* ---------- Scholar / HAL buttons ---------- */
  .profile-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
  }
  
  /* ---------- Publication groups ---------- */
  .pub-group { margin-bottom: 40px; }
  .pub-group h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--md-sys-color-secondary);
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    padding-bottom: 10px;
    margin: 0 0 16px;
  }
  
  .pub-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  .pub {
    background: var(--md-sys-color-surface-container-low);
    /* border: 1px solid var(--md-sys-color-outline-variant); */
    border-radius: var(--md-sys-shape-corner-medium);
    padding: 16px 18px;
    transition: box-shadow 0.2s ease, background-color 0.2s ease;
  }
  .pub:hover { box-shadow: var(--elevation-1); background: var(--md-sys-color-surface-container); }
  
  .pub__year {
    display: inline-block;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--md-sys-color-on-primary-container);
    background: var(--md-sys-color-primary-container);
    border-radius: var(--md-sys-shape-corner-small);
    padding: 2px 8px;
    margin-right: 10px;
    vertical-align: middle;
  }
  
  .pub__ref {
    margin: 0 0 10px;
    font-size: 0.94rem;
    line-height: 1.5;
    color: var(--md-sys-color-on-surface);
  }
  .pub__ref em { color: var(--md-sys-color-on-surface-variant); }
  
  .pub__links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .pub__link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--md-sys-color-primary);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-extra-large);
    padding: 5px 12px;
    transition: background-color 0.2s ease, color 0.2s ease;
  }
  .pub__link:hover { background: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); }
  .pub__link .md-icon-wrap { font-size: 1rem; }
  
  /* ---------- Workshops ---------- */
  .workshop-list { list-style: none; margin: 0; padding: 0; }
  .workshop-list li {
    display: flex;
    gap: 14px;
    padding: 12px 0;
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    font-size: 0.94rem;
  }
  .workshop-list li:last-child { border-bottom: none; }
  .workshop-list .md-icon-wrap { color: var(--md-sys-color-tertiary); margin-top: 2px; flex-shrink: 0; }
  .workshop-list .ws-date { display: block; font-size: 0.82rem; color: var(--md-sys-color-on-surface-variant); }
  
  /* ---------- Teaching ---------- */
  .course-group { margin-bottom: 28px; }
  .course-group h3 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0 0 4px;
    color: var(--md-sys-color-primary);
  }
  .course-group__sub { margin: 0 0 12px; font-size: 0.85rem; color: var(--md-sys-color-on-surface-variant); }
  
  .course-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }
  .course-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--md-sys-color-surface-container-low);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: 10px 14px;
    text-decoration: none;
    color: var(--md-sys-color-on-surface);
    font-size: 0.9rem;
    font-weight: 500;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
  }
  .course-link:hover { box-shadow: var(--elevation-1); border-color: var(--md-sys-color-primary); }
  .course-link .md-icon-wrap { color: var(--md-sys-color-primary); }
  
  /* ---------- Footer ---------- */
  footer {
    max-width: 1040px;
    margin: 40px auto 0;
    padding: 24px 20px 40px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    border-top: 1px solid var(--md-sys-color-outline-variant);
  }
  footer a { color: var(--md-sys-color-on-surface-variant); }
  
  /* ---------- Icon helper (Material Symbols) ---------- */
  .material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    vertical-align: middle;
    line-height: 1;
  }
  
  /* ---------- Responsive ---------- */
  @media (max-width: 760px) {
    .hero { grid-template-columns: 1fr; text-align: center; padding-top: 32px; }
    .hero__portrait { margin: 0 auto; width: 160px; height: 160px; }
    .two-col { grid-template-columns: 1fr; }
    .topbar__inner { padding: 8px 12px; gap: 10px; }
    .brand__text { display: none; }
    main { padding: 0 14px 60px; }
    .card { padding: 20px; }
  }