/* ============================================================
   RÉFÉRENCES — Stylesheet
   Tokens: --container-max-width, --color-light-green
   Domain accent colors are derived from the brand palette in
   layout.css (--color-red-main, --color-brown-main,
   --color-green-primary, --color-blue-main, --color-blue-mid)
   so each reference category reads as its own family while
   staying inside the existing design system.
   ============================================================ */

/* Defensive box-sizing scoped to this page's elements only — guards
   against horizontal overflow from the shared .section (width:100vw +
   padding) rule in layout.css on narrow viewports. */
.references-hero,
.heading,
.heading-content,
.ref-filter-section,
.ref-filter-bar,
.ref-filter-btn,
.ref-grid,
.ref-card,
.ref-card *,
.ref-card-toggle {
    box-sizing: border-box;
}

/* ---------- Hero section ---------- */
.references-hero {
  position: relative;
  background-image: url(../images/bg.svg);
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

/* Gradient scrim (blue-dark → blue-main) keeps the white heading
   legible over any photo/illustration used in bg.svg. */
.references-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--color-blue-dark) 82%, transparent) 0%,
    color-mix(in srgb, var(--color-blue-main) 55%, transparent) 100%
  );
  pointer-events: none;
}

.heading {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--container-max-width);
  min-width: 0;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  padding: 0 clamp(20px, 4vw, 40px);
  box-sizing: border-box;
}

.heading-content {
  max-width: 760px;
  min-width: 0;
}

.heading-content .section-header {
  margin-bottom: 1rem;
}

.heading-content h1 {
  color: #fff;
  font-family: var(--font-secondary);
  font-size: clamp(2rem, 1.25rem + 3.5vw, var(--font-size-h1));
  font-weight: var(--font-weight-h1);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  position: relative;
  padding-bottom: 1.25rem;
  overflow-wrap: break-word;
  word-break: break-word;
}

.heading-content h1::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 64px;
  height: 3px;
  background: var(--color-blue-main);
  animation: ref-grow-underline 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.2s both;
}

.heading-content p.lead {
  color: #fff;
  font-size: clamp(1rem, 0.85rem + 0.6vw, var(--font-size-lead));
  font-weight: 600;
  max-width: 640px;
  line-height: 1.7;
}

@keyframes ref-grow-underline {
  from { width: 0; }
  to { width: 64px; }
}

/* ---------- Filter bar ---------- */
.ref-filter-section {
    padding: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.07);
}

.ref-filter-bar {
    width: 100%;
    max-width: var(--container-max-width);
    padding: 20px 32px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    background: #fff;
}

.ref-filter-btn {
    display: inline-flex;
    align-items: center;
    position: relative;
    padding: 8px 18px;
    font-size: 0.875rem;
    font-weight: 600;
    color: #444;
    background: #f4f5f4;
    border: 1.5px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
    white-space: nowrap;
}

.ref-filter-btn:hover {
    background: var(--color-blue-pale);
    color: var(--color-blue-main);
    border-color: rgba(58, 144, 149, 0.25);
    transform: translateY(-1px);
}

.ref-filter-btn:active {
    transform: translateY(0);
}

.ref-filter-btn:focus-visible,
.ref-card-toggle:focus-visible {
    outline: 3px solid ;
    outline-offset: 2px;
}

.ref-filter-btn.active {
    background: var(--color-blue-main);
    color: #fff;
    border-color: var(--color-blue-main);
    box-shadow: 0 2px 10px rgba(58, 144, 149, 0.28);
}

/* Small dot indicator + per-domain color on the filter pills */
.ref-filter-btn[data-filter]:not([data-filter="all"]) {
    padding-left: 30px;
}

.ref-filter-btn[data-filter]:not([data-filter="all"])::before {
    content: "";
    position: absolute;
    left: 14px;
    top: 50%;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-blue-main);
    transform: translateY(-50%);
    transition: background 0.2s ease;
}

.ref-filter-btn[data-filter="cybersecurite"]::before { background: var(--color-blue-main); }
.ref-filter-btn[data-filter="reseaux"]::before { background: var(--color-blue-main); }
.ref-filter-btn[data-filter="telecoms"]::before { background: var(--color-blue-main); }
.ref-filter-btn[data-filter="pmo"]::before { background: var(--color-blue-main); }
.ref-filter-btn[data-filter="data-automation-ia"]::before { background: var(--color-blue-main); }

.ref-filter-btn.active[data-filter="cybersecurite"] { background: var(--color-blue-main); border-color: var(--color-blue-main); box-shadow: 0 2px 10px rgba(58, 144, 149, 0.28); }
.ref-filter-btn.active[data-filter="telecoms"] { background: var(--color-blue-main); border-color: var(--color-blue-main); box-shadow: 0 2px 10px rgba(58, 144, 149, 0.28); }
.ref-filter-btn.active[data-filter="pmo"] { background: var(--color-blue-main); border-color: var(--color-blue-main); box-shadow: 0 2px 10px rgba(58, 144, 149, 0.28); }
.ref-filter-btn.active[data-filter="data-automation-ia"] { background: var(--color-blue-main); border-color: var(--color-blue-main); box-shadow: 0 2px 10px rgba(58, 144, 149, 0.28); }

.ref-filter-btn.active::before {
    background: rgba(255, 255, 255, 0.95);
}

/* ---------- Grid ---------- */
.ref-grid {
    width: 100%;
    max-width: var(--container-max-width);
    padding: 36px 32px 48px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    background: #fff;
}

/* ---------- Card ---------- */
.ref-card {
    /* Default (fallback) accent — overridden per domain below */
    --domain-color: var(--color-blue-main);
    --domain-pale: var(--color-blue-pale);
    --domain-border: rgba(58, 144, 149, 0.22);

    position: relative;
    display: flex;
    flex-direction: column;
    gap: 16px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 14px;
    padding: 24px;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    overflow: hidden;
    transition:
        box-shadow 0.35s ease,
        transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
        opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1);

    /* scroll-animation initial state */
    opacity: 0;
    transform: translateY(28px) scale(0.97);
}

/* Domain accent mapping — reuses the brand palette from layout.css */
.ref-card[data-domain="cybersecurite"] {
    --domain-color: var(--color-blue-main);
    --domain-pale: var(--color-blue-pale);
    --domain-border: rgba(58, 144, 149, 0.22);
}

.ref-card[data-domain="reseaux"] {
    --domain-color: var(--color-blue-main);
    --domain-pale: var(--color-blue-pale);
    --domain-border: rgba(58, 144, 149, 0.22);
}

.ref-card[data-domain="telecoms"] {
    --domain-color: var(--color-blue-main);
    --domain-pale: var(--color-blue-pale);
    --domain-border: rgba(58, 144, 149, 0.22);
}

.ref-card[data-domain="pmo"] {
    --domain-color: var(--color-blue-main);
    --domain-pale: var(--color-blue-pale);
    --domain-border: rgba(58, 144, 149, 0.22);
}

.ref-card[data-domain="data-automation-ia"] {
    --domain-color: var(--color-blue-main);
    --domain-pale: var(--color-blue-pale);
    --domain-border: rgba(58, 144, 149, 0.22);
}

/* Top accent bar that draws itself in once the card enters view */
.ref-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--domain-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.ref-card.is-visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.ref-card.is-visible::before {
    transform: scaleX(1);
}

.ref-card:hover {
    box-shadow: 0 10px 30px var(--domain-border), 0 2px 10px rgba(0, 0, 0, 0.05);
    transform: translateY(-4px) scale(1.005);
}

/* Prevent hover lift fighting entrance animation */
.ref-card:not(.is-visible):hover {
    transform: translateY(28px) scale(0.97);
}

/* Cards hidden by filter */
.ref-card.is-hidden {
    display: none;
}

/* ---------- Card header ---------- */
.ref-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ref-card-icon {
    width: 60px;
    height: 60px;
    min-width: 44px;
    border-radius: 20px;
    background: var(--domain-pale);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    transition: background 0.3s ease, transform 0.3s ease;
}

.ref-card:hover .ref-card-icon {
    transform: scale(1.06);
}

.ref-card-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.ref-card-domain {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--domain-color);
    background: var(--domain-pale);
    padding: 4px 10px;
    border-radius: 100px;
}

/* ---------- Card body ---------- */
.ref-card-body {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ref-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: #111;
    margin: 0;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.ref-card-desc {
    font-size: 0.875rem;
    color: #555;
    line-height: 1.65;
    margin: 0;
}

/* ---------- Card footer / tags ---------- */
.ref-card-footer {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding-top: 8px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.ref-card-actions {
    margin-top: 16px;
}

.ref-card-toggle {
    appearance: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--domain-border);
    background: #fff;
    color: var(--domain-color);
    border-radius: 8px;
    padding: 11px 18px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.ref-card-toggle:hover,
.ref-card-toggle:focus {
    transform: translateY(-1px);
}

.ref-card-toggle-icon {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.ref-card.is-expanded .ref-card-toggle-icon {
    transform: rotate(180deg);
}

.ref-card-details {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.35s ease;
}

.ref-card.is-expanded .ref-card-details {
    opacity: 1;
}

.ref-card-detail {
    margin-top: 12px;
    color: #444;
    font-size: 0.9rem;
    line-height: 1.6;
}

.ref-card-detail strong {
    display: block;
    margin-bottom: 6px;
    color: #111;
}

.ref-card-detail ul {
    margin: 8px 0 0;
    padding-left: 18px;
    list-style: disc;
}

.ref-card-detail li {
    margin-bottom: 8px;
}

.ref-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--domain-color);
    background: var(--domain-pale);
    border: 1px solid var(--domain-border);
    border-radius: 6px;
    padding: 3px 10px;
}

/* ---------- Empty state ---------- */
.ref-empty {
    text-align: center;
    color: #888;
    font-size: 1rem;
    padding: 48px 20px;
    width: 100%;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
    .ref-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 700px) {
    .ref-filter-bar {
        padding: 16px;
        gap: 8px;
    }

    .ref-filter-btn {
        padding: 7px 14px;
        font-size: 0.8rem;
    }

    .ref-filter-btn[data-filter]:not([data-filter="all"]) {
        padding-left: 26px;
    }

    .ref-grid {
        grid-template-columns: 1fr;
        padding: 24px 16px 40px;
        gap: 16px;
    }

    .ref-card {
        padding: 20px;
    }
}

@media (max-width: 420px) {
    .heading-content h1 {
        padding-bottom: 1rem;
    }

    .ref-card {
        padding: 18px;
        gap: 12px;
    }

    .ref-card-icon {
        width: 48px;
        height: 48px;
        min-width: 40px;
        border-radius: 16px;
    }

    .ref-card-toggle {
        width: 100%;
        justify-content: center;
    }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    .ref-card,
    .ref-card::before,
    .ref-card-icon,
    .ref-card-toggle,
    .ref-card-toggle-icon,
    .ref-card-details,
    .ref-filter-btn,
    .heading-content h1::after {
        transition: none !important;
        animation: none !important;
    }
}