/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-mid);
  transition: box-shadow var(--transition);
}

.header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

.logo__icon {
  flex-shrink: 0;
}

.logo__accent {
  color: var(--color-blue);
}

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

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-muted);
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--color-blue);
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  border: 2px solid transparent;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition-fast), box-shadow var(--transition);
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--color-blue);
  color: var(--color-white);
  border-color: var(--color-blue);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--color-blue-dark);
  border-color: var(--color-blue-dark);
  box-shadow: var(--shadow-blue);
}

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.6);
}

.btn--outline:hover,
.btn--outline:focus-visible {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-white);
}

.btn--ghost {
  background: var(--color-gray);
  color: var(--color-ink);
  border-color: var(--color-gray-mid);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--color-white);
  border-color: var(--color-blue);
  color: var(--color-blue);
}

.btn--cyan {
  background: var(--color-cyan);
  color: var(--color-ink);
  border-color: var(--color-cyan);
}

.btn--cyan:hover,
.btn--cyan:focus-visible {
  background: var(--color-white);
  border-color: var(--color-white);
}

/* Filter pills */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.filter-btn {
  padding: 0.5rem 1rem;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-muted);
  background: var(--color-white);
  border: 1px solid var(--color-gray-mid);
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition-fast);
}

.filter-btn:hover,
.filter-btn:focus-visible {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

.filter-btn--active {
  background: var(--color-blue);
  border-color: var(--color-blue);
  color: var(--color-white);
}

.filter-btn--active:hover,
.filter-btn--active:focus-visible {
  background: var(--color-blue-dark);
  border-color: var(--color-blue-dark);
  color: var(--color-white);
}

/* Cards */
.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

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

.badge {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: var(--radius-btn);
}

.badge--hiit {
  background: rgba(0, 102, 255, 0.12);
  color: var(--color-blue);
}

.badge--spin {
  background: rgba(0, 212, 255, 0.2);
  color: #0088aa;
}

.badge--yoga {
  background: rgba(0, 200, 83, 0.12);
  color: #007a3d;
}

.badge--strength {
  background: rgba(10, 22, 40, 0.08);
  color: var(--color-ink);
}

/* Form */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--text-base);
  color: var(--color-ink);
  background: var(--color-white);
  border: 1px solid var(--color-gray-mid);
  border-radius: var(--radius-btn);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.15);
}

.form-input.is-invalid,
.form-textarea.is-invalid {
  border-color: var(--color-error);
}

.form-error {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-top: var(--space-xs);
  min-height: 1.25rem;
}

.form-success {
  padding: var(--space-md);
  background: rgba(0, 200, 83, 0.1);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-btn);
  color: #007a3d;
  font-weight: 500;
}

/* Footer */
.footer {
  background: var(--color-ink);
  padding-block: var(--space-2xl);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.footer__brand {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-white);
}

.footer__brand span {
  color: var(--color-cyan);
}

.footer__copy {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.65);
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__link {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.75);
  transition: color var(--transition-fast);
}

.footer__link:hover,
.footer__link:focus-visible {
  color: var(--color-cyan);
}

@media (max-width: 900px) {
  .hamburger {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-lg);
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-mid);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    padding: var(--space-sm) 0;
    color: var(--color-ink);
  }

  .nav .btn {
    width: 100%;
    margin-top: var(--space-sm);
  }
}