/**
 * components.css
 * ──────────────
 * Reusable UI: buttons, nav, cards, chips, forms, containers.
 */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.35s var(--ease), background 0.35s var(--ease),
    color 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.35) 0%, transparent 70%);
  opacity: 0;
  transform: scale(0);
  transition: opacity 0.5s, transform 0.5s;
}

.btn:active::after {
  opacity: 1;
  transform: scale(2.5);
  transition: opacity 0s, transform 0s;
}

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

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

.btn-primary[aria-disabled="true"] {
  opacity: 0.45;
  pointer-events: none;
  transform: none;
  box-shadow: none;
}

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

.btn-secondary:hover {
  border-color: var(--text);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 12px 22px;
  font-size: 14px;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease), border-color 0.5s var(--ease);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: #ddd;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), backdrop-filter 0.4s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(236, 236, 236, 0.8);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.nav-logo span {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-menu {
  display: none;
}

.nav-cta {
  flex-shrink: 0;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.3s;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.site-footer {
  padding: 80px 0 40px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 64px;
}

.footer-brand p {
  margin-top: 20px;
  max-width: 280px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.footer-col ul {
  display: grid;
  gap: 12px;
}

.footer-col a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.footer-col a:hover {
  color: var(--text);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-socials {
  display: flex;
  gap: 16px;
}

.footer-socials a {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: color 0.3s, border-color 0.3s, transform 0.3s var(--ease);
}

.footer-socials a:hover {
  color: var(--text);
  border-color: var(--text);
  transform: translateY(-2px);
}

.accordion-item {
  border-bottom: 1px solid var(--border);
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
}

.accordion-trigger span {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.accordion-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  transition: transform 0.4s var(--ease), background 0.3s;
}

.accordion-item.is-open .accordion-icon {
  transform: rotate(45deg);
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.accordion-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s var(--ease);
}

.accordion-item.is-open .accordion-panel {
  grid-template-rows: 1fr;
}

.accordion-panel-inner {
  overflow: hidden;
}

.accordion-panel p {
  padding-bottom: 28px;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-secondary);
}