/* ==========================================================================
   Components — Nav, Cards, Buttons, Footer
   ========================================================================== */

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  transition: background-color var(--transition-base), backdrop-filter var(--transition-base);
}

.nav.scrolled {
  background-color: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .nav.scrolled {
  background-color: rgba(255, 255, 255, 0.85);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav__logo {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link:hover,
.nav__link.active {
  color: var(--text-primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-blue);
  transition: width var(--transition-base);
}

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

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.theme-toggle:hover svg {
  color: var(--text-primary);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

.nav__hamburger.active span:nth-child(2) {
  opacity: 0;
}

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

/* Mobile Nav */
@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 2rem;
    gap: 0;
    background-color: var(--bg-primary);
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  [data-theme="light"] .nav__links {
    background-color: var(--bg-primary);
  }

  .nav__links.open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: 1.25rem;
    padding: 1rem 1.5rem;
    width: 100%;
    text-align: center;
  }

  .nav__link::after {
    display: none;
  }

  .theme-toggle {
    margin-top: 1rem;
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent-blue);
  color: #fff;
}

.btn--primary:hover {
  background: var(--accent-blue-hover);
  transform: translateY(-1px);
}

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

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

.btn--ocean {
  background: var(--accent-ocean);
  color: #fff;
}

.btn--ocean:hover {
  background: var(--accent-ocean-hover);
  transform: translateY(-1px);
}

.btn--warm {
  background: var(--accent-warm);
  color: #000;
}

.btn--warm:hover {
  background: var(--accent-warm-hover);
  transform: translateY(-1px);
}

.btn--green {
  background: var(--accent-green);
  color: #fff;
}

.btn--green:hover {
  background: var(--accent-green-hover);
  transform: translateY(-1px);
}

.btn--sm {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
}

.btn--lg {
  padding: 1rem 2.5rem;
  font-size: 1.125rem;
}

/* App Store Badge */
.app-store-badge {
  display: inline-block;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.app-store-badge:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.app-store-badge img {
  height: 48px;
  width: auto;
}

/* --- Cards --- */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 2rem;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--shadow);
}

.card--ocean {
  border-color: rgba(6, 182, 212, 0.3);
}

.card--ocean:hover {
  border-color: var(--accent-ocean);
}

.card--warm {
  border-color: rgba(245, 158, 11, 0.3);
}

.card--warm:hover {
  border-color: var(--accent-warm);
}

.card--green {
  border-color: rgba(16, 185, 129, 0.3);
}

.card--green:hover {
  border-color: var(--accent-green);
}

/* --- App Card (Showcase) --- */
.app-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
}

.app-card__icon {
  width: 80px;
  height: 80px;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 4px 16px var(--shadow);
}

.app-card__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Placeholder for missing images */
.app-card__icon--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
}

.app-card__icon--ocean {
  background: linear-gradient(135deg, #0e7490, #06b6d4);
}

.app-card__icon--warm {
  background: linear-gradient(135deg, #d97706, #f59e0b);
}

.app-card__icon--green {
  background: linear-gradient(135deg, #059669, #10b981);
}

.app-card__name {
  font-size: 1.25rem;
  font-weight: 700;
}

.app-card__desc {
  font-size: 0.9375rem;
}

/* --- Feature Card --- */
.feature-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-sm);
  color: #fff;
}

.feature-card__icon--ocean {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-ocean);
}

.feature-card__icon--warm {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-warm);
}

.feature-card__icon--green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
}

.feature-card__icon svg {
  width: 24px;
  height: 24px;
}

.feature-card__title {
  font-size: 1.125rem;
  font-weight: 600;
}

.feature-card__desc {
  font-size: 0.9375rem;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 4rem 1.5rem 2rem;
  background: var(--bg-secondary);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer__logo {
  font-size: 1.375rem;
  font-weight: 700;
}

.footer__desc {
  font-size: 0.875rem;
  max-width: 300px;
}

.footer__heading {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.footer__link {
  display: block;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  padding: 0.25rem 0;
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  max-width: var(--max-width);
  margin: 3rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .footer__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .footer__desc {
    max-width: none;
  }
}

/* --- Blog Card (shared between home and blog pages) --- */
.blog-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.blog-card__date {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.blog-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.blog-card:hover .blog-card__title {
  color: var(--accent-blue);
}

.blog-card__excerpt {
  font-size: 0.9375rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card__read-more {
  margin-top: auto;
  padding-top: 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-blue);
}

/* --- Placeholder SVG Icons --- */
.app-card__icon--placeholder svg {
  width: 40px;
  height: 40px;
}

/* --- Tag --- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: 100px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

/* --- Tech Stack Icons --- */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.tech-stack__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.tech-stack__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-sm);
  color: var(--accent-blue);
}

.tech-stack__icon svg {
  width: 24px;
  height: 24px;
}

.tech-stack__label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
}