/* ========================================
   Portfolio App - Layout & Navigation
   ======================================== */

/* === APP SHELL === */
.app-shell {
  display: flex;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--color-bg-primary);
  width: 100%;
}

/* === SIDEBAR (Desktop Only) === */
.sidebar {
  width: var(--sidebar-width);
  background: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border-light);
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md) 0;
}

.sidebar-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}

/* Sidebar Navigation Items */
.nav-item {
  display: block;
  margin: var(--space-xs) var(--space-md);
}

.nav-item .nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav-item .nav-link:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.nav-item .nav-link.active {
  background: var(--color-primary-bg);
  color: var(--color-primary);
}

.nav-item .nav-link .nav-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-item .nav-link .nav-icon svg {
  width: 20px;
  height: 20px;
}

/* === MAIN CONTENT AREA === */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

.page-content {
  flex: 1;
  padding: var(--space-xl);
  width: 100%;
}

/* === MOBILE HEADER === */
.mobile-header {
  display: none;
  padding: var(--space-md) var(--space-lg);
  padding-top: calc(var(--space-md) + var(--safe-area-top));
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 50;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.mobile-header .page-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin: 0;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* === BOTTOM NAVIGATION (Mobile Only) === */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
  padding-bottom: var(--safe-area-bottom);
  z-index: 100;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .bottom-nav {
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

.bottom-nav-container {
  display: flex;
  justify-content: space-around;
  height: var(--nav-height-mobile);
}

.nav-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  text-decoration: none;
  color: var(--color-text-muted);
  gap: 2px;
  transition: color var(--transition-fast);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  position: relative;
  font-family: inherit;
}

.nav-tab::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 40px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: transform var(--transition-fast);
}

.nav-tab.active::before {
  transform: translateX(-50%) scaleX(1);
}

.nav-tab.active,
.nav-tab:hover {
  color: var(--color-primary);
}

.nav-tab .nav-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-tab .nav-icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.nav-tab .nav-label {
  font-size: 10px;
  font-weight: var(--font-weight-medium);
}

/* === PAGE HEADER === */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
  gap: var(--space-md);
  flex-wrap: wrap;
}

.page-header .page-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin: 0;
}

.page-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* === HERO SECTION === */
.hero-section {
  text-align: center;
  padding: var(--space-2xl) 0;
  margin-bottom: var(--space-2xl);
}

.hero-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* === SECTION === */
.section {
  margin-bottom: var(--space-2xl);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

/* === PROJECTS GRID === */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* === SOCIAL LINKS === */
.social-links {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

.social-link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* === RESPONSIVE BREAKPOINTS === */

/* Tablet and below */
@media (max-width: 1023px) {
  .desktop-only {
    display: none !important;
  }

  .sidebar {
    transform: translateX(-100%);
  }

  .main-content {
    margin-left: 0;
    padding-bottom: calc(var(--nav-height-mobile) + var(--safe-area-bottom));
  }

  .mobile-header {
    display: flex;
  }

  .bottom-nav {
    display: block;
  }

  .page-content {
    padding: var(--space-md);
  }

  .page-header {
    display: none; /* Title shown in mobile header instead */
  }

  .hero-section {
    padding: var(--space-lg) 0;
  }

  .hero-title {
    font-size: var(--font-size-2xl);
  }
}

/* Mobile only */
@media (max-width: 767px) {
  .page-content {
    padding: var(--space-md) var(--space-sm);
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .mobile-only {
    display: none !important;
  }

  .page-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
  }
}

/* === ANIMATIONS === */
@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-content {
  animation: pageEnter var(--transition-normal);
}