/* ========== Header / Navigation ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: background var(--transition-base), box-shadow var(--transition-base), padding var(--transition-base);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
  padding: var(--space-sm) 0;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-inverse);
  transition: color var(--transition-base);
}

.logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-cta);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.1rem;
}

.header.scrolled .logo {
  color: var(--color-text);
}

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

.nav__link {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: 500;
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-cta);
  transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.header.scrolled .nav__link {
  color: var(--color-text);
}

.nav__link:hover,
.header.scrolled .nav__link:hover {
  color: var(--color-primary);
}

/* Dropdown */
.nav__dropdown {
  position: relative;
}

.nav__dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.nav__dropdown-toggle .arrow {
  font-size: 0.7rem;
  transition: transform var(--transition-fast);
}

.nav__dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-sm));
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-sm) 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.nav__dropdown:hover .nav__dropdown-menu {
  opacity: 1;
  visibility: visible;
}

.nav__dropdown:hover .arrow {
  transform: rotate(180deg);
}

.nav__dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-lg);
  color: var(--color-text);
  font-size: 0.9rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav__dropdown-menu a:hover {
  background: var(--color-bg-light);
  color: var(--color-primary);
}

/* CTA Button in Nav */
.nav__cta {
  background: var(--gradient-cta);
  color: white !important;
  padding: var(--space-sm) var(--space-lg) !important;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
  color: white !important;
}

.nav__cta::after {
  display: none;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
  background: none;
  border: none;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-text-inverse);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header.scrolled .hamburger span {
  background: var(--color-text);
}

.nav-open .hamburger span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-open .hamburger span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 2rem;
  border: none;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--gradient-cta);
  color: white;
}

.btn--primary:hover {
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
  color: white;
}

.btn--secondary {
  background: transparent;
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.8);
  color: white;
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: white;
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

.btn--lg {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

/* ========== Cards ========== */
.card {
  background: white;
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid var(--color-border);
}

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

.card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  font-size: 1.5rem;
}

.card__icon--blue {
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  color: var(--color-primary);
}

.card__icon--purple {
  background: linear-gradient(135deg, #f5f3ff, #ede9fe);
  color: var(--color-accent);
}

.card__icon--green {
  background: linear-gradient(135deg, #f0fdf4, #dcfce7);
  color: #16a34a;
}

.card__icon--orange {
  background: linear-gradient(135deg, #fff7ed, #fed7aa);
  color: #ea580c;
}

.card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.card__subtitle {
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.card__text {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-lg);
  color: var(--color-primary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: gap var(--transition-fast);
}

.card__link:hover {
  gap: 10px;
}

.card__features {
  margin-top: var(--space-md);
}

.card__features li {
  padding: var(--space-xs) 0;
  font-size: 0.9rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.card__features li::before {
  content: '✓';
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.8rem;
}

/* ========== Page Hero (subpages) ========== */
.page-hero {
  background: var(--gradient-hero);
  padding: 10rem 0 5rem;
  text-align: center;
  color: var(--color-text-inverse);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 60%),
              radial-gradient(circle at 70% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 60%);
  pointer-events: none;
}

.page-hero h1 {
  font-size: 2.75rem;
  margin-bottom: var(--space-md);
  position: relative;
}

.page-hero p {
  font-size: 1.15rem;
  color: rgba(248, 250, 252, 0.75);
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

/* ========== CTA Banner ========== */
.cta-banner {
  background: var(--gradient-hero);
  padding: var(--space-4xl) 0;
  text-align: center;
  color: var(--color-text-inverse);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
  animation: float 8s ease-in-out infinite;
}

.cta-banner h2 {
  font-size: 2rem;
  margin-bottom: var(--space-md);
  position: relative;
}

.cta-banner p {
  color: rgba(248, 250, 252, 0.7);
  margin-bottom: var(--space-xl);
  position: relative;
}

.cta-banner .btn {
  position: relative;
}

/* ========== Footer ========== */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: var(--space-4xl) 0 var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer__brand {
  max-width: 300px;
}

.footer__brand .logo {
  margin-bottom: var(--space-md);
}

.footer__brand p {
  color: rgba(248, 250, 252, 0.6);
  font-size: 0.9rem;
}

.footer__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  color: var(--color-text-inverse);
}

.footer__links a {
  display: block;
  padding: var(--space-xs) 0;
  color: rgba(248, 250, 252, 0.6);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-primary-light);
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  color: rgba(248, 250, 252, 0.6);
  font-size: 0.9rem;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(248, 250, 252, 0.4);
}

/* ========== Back to Top ========== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: var(--gradient-cta);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-fast);
  z-index: 999;
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* ========== Tags / Badges ========== */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: linear-gradient(135deg, #eff6ff, #f5f3ff);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
}

/* ========== Feature List ========== */
.feature-item {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
}

.feature-item__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.feature-item__content h4 {
  margin-bottom: var(--space-xs);
}

.feature-item__content p {
  font-size: 0.9rem;
}