/* Tang-IA: components.css
   Boutons, cards, badges, accordion, navigation, etc. */

/* ============================
   BUTTONS
   ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-soft);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out);
  z-index: 0;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-strong);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-primary > * {
  position: relative;
  z-index: 1;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--text-primary);
}

.btn-secondary:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

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

.btn-arrow::after {
  content: '→';
  display: inline-block;
  transition: transform var(--duration-base) var(--ease-out);
}

.btn-arrow:hover::after {
  transform: translateX(4px);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* ============================
   BADGES
   ============================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--ink-glow);
  color: var(--text-primary);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.badge-recommended {
  background: var(--accent);
  color: var(--text-primary);
  font-weight: 600;
}

.badge-dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--accent);
  display: inline-block;
}

/* ============================
   CARDS
   ============================ */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  transition: all var(--duration-base) var(--ease-out);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  transform: translateY(-4px);
  border-color: var(--accent-deep);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--ink-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--text-primary);
  transition: all var(--duration-base) var(--ease-out);
}

.card-interactive:hover .card-icon {
  background: var(--accent);
  color: var(--text-primary);
  transform: rotate(-5deg) scale(1.05);
}

.card h3 {
  margin-bottom: var(--space-3);
}

.card p {
  color: var(--text-secondary);
}

/* ============================
   HEADER NAV
   ============================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding-block: var(--space-2);
  background: rgba(255, 255, 255, 0);
  backdrop-filter: blur(0px);
  transition: all var(--duration-base) var(--ease-out);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding-block: var(--space-1);
}

.site-header .container {
  max-width: none;
  padding-inline: clamp(1.25rem, 3.5vw, 3.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.site-logo img {
  height: clamp(44px, 5vw, 80px);
  width: auto;
  display: block;
}

.site-header.is-scrolled .site-logo img {
  height: clamp(36px, 3.7vw, 60px);
}

@media (max-width: 700px) {
  .site-logo img {
    height: 40px;
  }
  .site-header.is-scrolled .site-logo img {
    height: 32px;
  }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.site-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding-block: var(--space-2);
}

.site-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration-base) var(--ease-out);
}

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

.site-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-primary);
  transition: all var(--duration-base) var(--ease-out);
}

.menu-toggle.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 900px) {
  .site-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(360px, 80vw);
    height: 100vh;
    background: var(--bg-elevated);
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: var(--space-12);
    gap: var(--space-6);
    box-shadow: var(--shadow-xl);
    transition: right var(--duration-slow) var(--ease-out);
  }

  .site-nav.is-open {
    right: 0;
  }

  .site-nav a {
    font-size: var(--text-xl);
    font-family: var(--font-serif);
  }

  .menu-toggle {
    display: flex;
  }

  .header-cta {
    display: none;
  }
}

/* ============================
   ACCORDION (FAQ)
   ============================ */
.accordion-item {
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.accordion-item:first-child {
  border-top: 1px solid var(--border-subtle);
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: var(--space-6) 0;
  font-size: var(--text-lg);
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: color var(--duration-base) var(--ease-out);
}

.accordion-trigger:hover {
  color: var(--text-primary);
}

.accordion-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all var(--duration-base) var(--ease-out);
}

.accordion-icon::before,
.accordion-icon::after {
  content: '';
  position: absolute;
  background: var(--text-primary);
  transition: transform var(--duration-base) var(--ease-out);
}

.accordion-icon::before {
  width: 12px;
  height: 1.5px;
}

.accordion-icon::after {
  width: 1.5px;
  height: 12px;
}

.accordion-item.is-open .accordion-icon {
  background: var(--accent);
}

.accordion-item.is-open .accordion-icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease-out);
}

.accordion-content-inner {
  padding-bottom: var(--space-6);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 720px;
}

/* ============================
   CHECKMARK LIST
   ============================ */
.check-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.check-list li {
  position: relative;
  padding-left: calc(var(--space-6) + var(--space-1));
  color: var(--text-secondary);
  line-height: var(--leading-snug);
}

.check-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background: var(--ink-glow);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='M3.5 8L6.5 11L12.5 5' stroke='%230B1023' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-size: 16px;
  background-repeat: no-repeat;
  background-position: center;
}

.check-list li strong {
  display: block;
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: var(--space-1);
}

/* ============================
   STATS / METRICS
   ============================ */
.metric-value {
  font-family: var(--font-serif);
  font-size: var(--text-5xl);
  font-weight: 400;
  color: var(--accent-deep);
  line-height: 1;
  letter-spacing: var(--tracking-tight);
  display: inline-block;
}

.metric-label {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: var(--space-2);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

/* ============================
   SECTION HEADER
   ============================ */
.section-header {
  max-width: 720px;
  margin-bottom: var(--space-16);
  text-align: left;
}

.section-header.center {
  margin-inline: auto;
  text-align: center;
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header .lead {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.eyebrow::before {
  content: '';
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  display: inline-block;
}

.cta-final .eyebrow::before,
.team-content .eyebrow::before {
  background: var(--accent);
}

/* ============================
   ANIMATIONS UTILITIES
   ============================ */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 0 0 var(--accent-glow);
  }
  50% {
    box-shadow: 0 0 0 12px transparent;
  }
}

.animate-pulse {
  animation: pulse-glow 2.5s var(--ease-out) infinite;
}

/* ============================
   DIVIDER
   ============================ */
.divider {
  height: 1px;
  background: var(--border-subtle);
  border: none;
  margin-block: var(--space-12);
}

.divider-dotted {
  background: linear-gradient(90deg, var(--border-medium) 50%, transparent 50%);
  background-size: 8px 1px;
  background-repeat: repeat-x;
}