:root {
  /* Light Theme Tokens */
  --bg-body: #f0f2f5;
  --bg-gradient: linear-gradient(135deg, #8bc6ec 0%, #9599e2 100%);
  --text-main: #1d1d1f;
  --text-muted: #48484a;
  --glass-bg: rgba(255, 255, 255, 0.4);
  --glass-border: rgba(255, 255, 255, 0.6);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
  --accent-color: #0071e3;
  --accent-hover: #0077ed;
  --danger-color: #ff3b30;
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --font-main:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  --nav-height: 60px;
}

[data-theme="dark"] {
  /* Dark Theme Tokens */
  --bg-body: #000000;
  --bg-gradient: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
  --text-main: #f5f5f7;
  --text-muted: #a1a1a6;
  --glass-bg: rgba(0, 0, 0, 0.3);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  --accent-color: #2997ff;
  --accent-hover: #409cff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background: var(--bg-gradient) no-repeat fixed;
  background-size: cover;
  color: var(--text-main);
  transition:
    background-image 0.5s ease,
    color 0.3s ease;
  line-height: 1.5;
  padding-top: var(--nav-height); /* Space for fixed navbar */
  min-height: 100vh;
}

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.narrow-content {
  max-width: 800px;
}

.mini-content {
  max-width: 600px;
}

.text-center {
  text-align: center;
}
.hidden {
  display: none !important;
}
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.justify-center {
  justify-content: center;
}
.gap-2 {
  gap: 0.5rem;
}
.gap-4 {
  gap: 1rem;
}
.mt-4 {
  margin-top: 1rem;
}
.mb-4 {
  margin-bottom: 1rem;
}
.w-full {
  width: 100%;
}

/* Glass Components */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}
/* More playful gradient background for cards in light mode to pop against darker bg, or keep simple */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.glass-card:hover {
  transform: translateY(-4px);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.2rem;
  text-decoration: none;
  color: var(--text-main);
}

.nav-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.2s;
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-color);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: scale(1.02);
}

.btn-secondary {
  background-color: rgba(128, 128, 128, 0.1);
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: rgba(128, 128, 128, 0.2);
}

.btn-danger {
  background-color: var(--danger-color);
  color: white;
}

.btn-sm {
  padding: 4px 12px;
  font-size: 0.8rem;
}

/* Inputs */
.input-group {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: rgba(128, 128, 128, 0.05);
  color: var(--text-main);
  font-family: inherit;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: var(--accent-color);
  background: rgba(128, 128, 128, 0.1);
}

/* Chips */
.chip {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 16px;
  background: rgba(128, 128, 128, 0.15);
  color: var(--text-main);
  font-size: 0.8rem;
  margin-right: 6px;
  margin-bottom: 6px;
  cursor: pointer;
  transition: background 0.2s;
  text-decoration: none;
}

.chip:hover,
.chip.active {
  background: var(--accent-color);
  color: white;
}

/* Grid Layouts */
.grid-albums {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.album-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 12px;
}

.album-info h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
  color: var(--text-main);
}

.album-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Masonry Layout for Photos */
.masonry-grid {
  column-count: 4;
  column-gap: 20px;
}

@media (max-width: 1024px) {
  .masonry-grid {
    column-count: 3;
  }
}
@media (max-width: 768px) {
  .masonry-grid {
    column-count: 2;
  }
}
@media (max-width: 480px) {
  .masonry-grid {
    column-count: 1;
  }
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 20px;
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
}

.masonry-item img {
  width: 100%;
  display: block;
  border-radius: var(--radius-md);
  transition: transform 0.3s;
}

.masonry-item:hover img {
  transform: scale(1.03);
}

.photo-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 15px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  background-size: cover;
  color: white;
  opacity: 0;
  transition: opacity 0.2s;
}

.masonry-item:hover .photo-overlay {
  opacity: 1;
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  z-index: 2000;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-content {
  max-width: 90%;
  max-height: 90vh;
  border-radius: 4px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: none;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  font-size: 1.5rem;
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  background: rgba(255, 255, 255, 0.4);
}

.lightbox-close {
  top: 20px;
  right: 20px;
}
.lightbox-prev {
  left: 20px;
}
.lightbox-next {
  right: 20px;
}

.lightbox-details-btn {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--glass-bg);
  padding: 10px 20px;
  border-radius: 20px;
  backdrop-filter: blur(10px);
  text-decoration: none;
  color: var(--text-main);
  font-weight: bold;
}

/* Login/Signup centering */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: calc(100vh - var(--nav-height));
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--glass-bg);
  color: var(--text-main);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  animation: slideIn 0.3s ease;
  display: flex;
  align-items: center;
  gap: 10px;
}

@keyframes slideIn {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Page Specifics */
.hero {
  text-align: center;
  padding: 80px 20px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  background: linear-gradient(
    135deg,
    var(--text-main) 0%,
    var(--text-muted) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --- Responsive Adjustments --- */

/* Large Screens (Laptops) */
@media (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }

  .masonry-grid {
    column-count: 3;
  }
}

/* Medium Screens (Tablets) */
@media (max-width: 768px) {
  :root {
    --nav-height: 50px;
  }

  .navbar .container {
    padding: 0 15px;
  }

  .nav-links {
    gap: 15px;
    font-size: 0.85rem;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .grid-albums {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }

  .masonry-grid {
    column-count: 2;
  }

  .narrow-content,
  .mini-content {
    max-width: 100%;
    padding: 0 10px;
  }
}

/* Small Screens (Mobile) */
@media (max-width: 480px) {
  .navbar {
    height: auto;
    padding: 10px 0;
  }

  .navbar .container {
    flex-direction: column;
    gap: 10px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    display: flex; /* Ensure it overrides any hiding */
  }

  .nav-actions {
    width: 100%;
    justify-content: center;
  }

  /* Typography */
  .hero h1 {
    font-size: 2rem;
  }

  h1 {
    font-size: 1.75rem;
  }
  h2 {
    font-size: 1.5rem;
  }

  /* Card Adjustments */
  .glass-card {
    padding: 20px 15px;
  }

  .auth-card {
    max-width: 100%;
    width: 100%;
  }

  /* Contact Page */
  .contact-actions {
    flex-direction: column;
    width: 100%;
  }

  /* Full width buttons */
  .btn {
    width: 100%;
    margin-bottom: 8px;
  }

  /* Ensure form inputs are easy to tap */
  .form-control {
    font-size: 16px; /* Prevents iOS zoom */
    padding: 12px;
  }

  .masonry-grid {
    column-count: 1;
  }

  /* Album Grid */
  .grid-albums {
    grid-template-columns: 1fr;
  }
}

/* Shared Auth Utilities */
.text-muted-custom { color: var(--text-muted); }
.auth-footer { border-top: 1px solid var(--glass-border); padding-top: 16px; margin-top: 1rem; }
.auth-footer-text { font-size: 0.9rem; }
.text-accent { color: var(--accent-color); text-decoration: none; }