/* ================================================
   iBioKaare — Landing Page Styles
   ================================================ */

/* ── Navbar ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding: var(--sp-3) 0;
  transition: all var(--duration-normal) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: var(--clr-bg-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--clr-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8);
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  color: var(--clr-text-primary);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--fs-lg);
  text-decoration: none;
}

.navbar__logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--grad-accent);
  font-size: var(--fs-sm);
  font-weight: 800;
  color: white;
  font-family: var(--font-heading);
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}

.navbar__link {
  color: var(--clr-text-secondary);
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.navbar__link:hover {
  color: var(--clr-text-primary);
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform var(--duration-normal) var(--ease-out);
}

.navbar__link:hover::after {
  transform: scaleX(1);
}

.btn--sm {
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-xs);
}

.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--sp-2);
  z-index: calc(var(--z-overlay) + 1);
}

.navbar__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text-primary);
  border-radius: 2px;
  transition: all var(--duration-normal) var(--ease-out);
}

.navbar__hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.navbar__hamburger.active span:nth-child(2) {
  opacity: 0;
}
.navbar__hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Menu ── */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: var(--clr-bg-glass);
  backdrop-filter: blur(30px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-8);
}

.mobile-menu__link {
  font-family: var(--font-heading);
  font-size: var(--fs-2xl);
  font-weight: 700;
  color: var(--clr-text-primary);
  transition: color var(--duration-fast) var(--ease-out);
}

.mobile-menu__link:hover {
  color: var(--clr-accent);
}

.mobile-menu__cta {
  margin-top: var(--sp-4);
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: calc(var(--header-height) + var(--sp-8));
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--grad-hero);
  overflow: hidden;
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: float 12s ease-in-out infinite;
}

.hero__orb--1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #3b82f6 0%, transparent 70%);
  top: -10%;
  right: -5%;
  animation-delay: 0s;
}

.hero__orb--2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #8b5cf6 0%, transparent 70%);
  bottom: -10%;
  left: -5%;
  animation-delay: -4s;
}

.hero__orb--3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, #06b6d4 0%, transparent 70%);
  top: 40%;
  left: 30%;
  animation-delay: -8s;
}

.hero__grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
}

.hero__content {
  position: relative;
  text-align: center;
  max-width: 800px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-5);
  background: var(--clr-accent-soft);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-accent);
  margin-bottom: var(--sp-8);
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero__title {
  font-size: var(--fs-5xl);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--sp-6);
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: var(--fs-lg);
  color: var(--clr-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--sp-10);
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  gap: var(--sp-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--sp-16);
}

.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  padding-top: var(--sp-8);
  border-top: 1px solid var(--clr-border);
}

.hero__stat {
  text-align: center;
}

.hero__stat-value {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--clr-text-primary);
}

.hero__stat-label {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__stat-divider {
  width: 1px;
  height: 40px;
  background: var(--clr-border);
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--sp-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  color: var(--clr-text-muted);
  font-size: var(--fs-xs);
  animation: fade-in 1s ease 2s forwards;
  opacity: 0;
}

.hero__scroll-arrow {
  width: 20px;
  height: 30px;
  border: 2px solid var(--clr-text-muted);
  border-radius: 12px;
  position: relative;
}

.hero__scroll-arrow::after {
  content: '';
  width: 4px;
  height: 8px;
  background: var(--clr-text-muted);
  border-radius: 4px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: float 2s ease-in-out infinite;
}

/* ── Sections ── */
.section {
  padding: var(--sp-24) 0;
  position: relative;
}

.section__header {
  margin-bottom: var(--sp-12);
}

.section__header--center {
  text-align: center;
}

.section__header--center .section-desc {
  margin: 0 auto;
}

/* ── Card Grid ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-6);
}

.cards-grid--exams {
  grid-template-columns: repeat(4, 1fr);
}

/* ── Individual Class/Exam Card ── */
.class-card {
  position: relative;
  background: var(--clr-bg-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  cursor: pointer;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  opacity: 0;
  transform: translateY(30px);
}

.class-card.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}

.class-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-gradient);
  opacity: 0.7;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.class-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--card-gradient);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
  pointer-events: none;
}

.class-card:hover {
  transform: translateY(-6px);
  border-color: var(--clr-border-hover);
  box-shadow: 0 12px 40px var(--card-glow);
}

.class-card:hover::before {
  opacity: 1;
}

.class-card:hover::after {
  opacity: 0.05;
}

.class-card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--card-gradient);
  font-size: 1.5rem;
  position: relative;
  z-index: 1;
}

.class-card__body {
  position: relative;
  z-index: 1;
}

.class-card__label {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: var(--sp-1);
}

.class-card__desc {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  margin-bottom: var(--sp-2);
}

.class-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 1;
}

.class-card__chapters {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

.class-card__arrow {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--clr-bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-normal) var(--ease-out);
}

.class-card:hover .class-card__arrow {
  background: var(--card-gradient);
  transform: translateX(4px);
}

.class-card__arrow svg {
  width: 14px;
  height: 14px;
  stroke: var(--clr-text-secondary);
  stroke-width: 2.5;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.class-card:hover .class-card__arrow svg {
  stroke: white;
}

/* ── Features Grid ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
}

.feature-card {
  background: var(--clr-bg-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-8);
  text-align: center;
  transition: all var(--duration-normal) var(--ease-out);
  opacity: 0;
  transform: translateY(30px);
}

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

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

.feature-card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--sp-4);
  display: block;
}

.feature-card__title {
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  font-weight: 700;
  margin-bottom: var(--sp-2);
}

.feature-card__desc {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  line-height: 1.6;
}

/* ── CTA Section ── */
.cta-section {
  padding-bottom: var(--sp-16);
}

.cta-card {
  position: relative;
  padding: var(--sp-16) var(--sp-12);
  border-radius: var(--radius-xl);
  text-align: center;
  overflow: hidden;
}

.cta-card__content {
  position: relative;
  z-index: 1;
}

.cta-card__title {
  font-size: var(--fs-3xl);
  font-weight: 800;
  margin-bottom: var(--sp-4);
}

.cta-card__desc {
  font-size: var(--fs-md);
  color: var(--clr-text-secondary);
  max-width: 500px;
  margin: 0 auto var(--sp-8);
}

.cta-card__actions {
  display: flex;
  gap: var(--sp-4);
  justify-content: center;
  flex-wrap: wrap;
}

.cta-card__glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 120%, rgba(59, 130, 246, 0.15), transparent 60%);
  pointer-events: none;
}

/* ── Footer ── */
.footer {
  padding: var(--sp-12) 0 var(--sp-6);
  border-top: 1px solid var(--clr-border);
  background: var(--clr-bg-secondary);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-12);
  margin-bottom: var(--sp-8);
}

.footer__brand {
  max-width: 320px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--fs-lg);
  margin-bottom: var(--sp-3);
}

.footer__tagline {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  line-height: 1.6;
}

.footer__links {
  display: flex;
  gap: var(--sp-16);
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.footer__col h4 {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-text-primary);
  margin-bottom: var(--sp-1);
}

.footer__col a {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__col a:hover {
  color: var(--clr-accent);
}

.footer__bottom {
  padding-top: var(--sp-6);
  border-top: 1px solid var(--clr-border);
  text-align: center;
}

.footer__bottom p {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar__links { display: none; }
  .navbar__hamburger { display: flex; }

  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-4);
  }

  .cards-grid--exams {
    grid-template-columns: repeat(2, 1fr);
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .hero__title {
    font-size: var(--fs-3xl);
  }

  .hero__stats {
    gap: var(--sp-4);
  }

  .hero__scroll-indicator { display: none; }

  .footer__inner {
    flex-direction: column;
    gap: var(--sp-8);
  }

  .footer__links {
    gap: var(--sp-8);
  }

  .cta-card {
    padding: var(--sp-10) var(--sp-6);
  }

  .section {
    padding: var(--sp-16) 0;
  }
}

@media (max-width: 480px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .cards-grid--exams {
    grid-template-columns: 1fr;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .cta-card__actions {
    flex-direction: column;
    align-items: center;
  }
}