/* ==========================================================================
   Base & Variables (Sleek Minimalist & Disruptive)
   ========================================================================== */
:root {
  /* Light Mode (Forced Default) */
  --bg-color: #FAFAFA;
  --surface-color: #FFFFFF;
  --text-primary: #111111;
  --text-secondary: #666666;
  --border-color: #EAEAEA;
  --accent: #FF3366; /* Bold disruptive accent */
  --accent-hover: #E62E5C;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.08);
  
  --radius-xl: 24px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --nav-height: 80px;
}

[data-theme="dark"] {
  --bg-color: #0A0A0A;
  --surface-color: #141414;
  --text-primary: #FFFFFF;
  --text-secondary: #A0A0A0;
  --border-color: #222222;
  --accent: #FF3366;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.4);
}

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

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

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  padding-top: var(--nav-height); /* Space for fixed navbar */
  padding-bottom: 4rem;
}

/* Background grid pattern */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; width: 100vw; height: 100vh;
  background-image: linear-gradient(var(--border-color) 1px, transparent 1px),
                    linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.3;
  z-index: -1;
  pointer-events: none;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 5%;
}

/* Global Navbar */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background-color: rgba(var(--surface-color), 0.9);
}

.navbar .logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar .logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-item {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-item svg {
  width: 18px; height: 18px;
}

/* Theme Toggle */
.theme-toggle {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: all var(--transition);
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Buttons */
.btn-primary {
  background: var(--text-primary);
  color: var(--bg-color);
  border: none;
  padding: 1rem 2rem;
  border-radius: 100px;
  font-weight: 600;
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: var(--accent);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 1rem 2rem;
  border-radius: 100px;
  font-weight: 600;
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  border-color: var(--text-primary);
  background: var(--surface-color);
}


/* Typography */
h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1rem;
}
.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 4rem;
  line-height: 1.6;
}

/* Dropdown menu */
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--surface-color);
  min-width: 260px;
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 1rem 0;
  z-index: 1001;
}
.dropdown:hover .dropdown-content {
  display: block;
}
.dropdown-content a {
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 500;
  font-size: 0.95rem;
  transition: background 0.2s;
}
.dropdown-content a:hover {
  background-color: rgba(255, 51, 102, 0.05);
  color: var(--accent);
}

/* App specific layout */
.app-header {
  margin-bottom: 3rem;
}
.app-description {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  margin-bottom: 2rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Controls & Dropzone */
.controls-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}
.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
  min-width: 200px;
}
.control-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.control-group select, .control-group input {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-color);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  outline: none;
}

.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
  padding: 5rem 2rem;
  text-align: center;
  transition: all var(--transition);
  background: var(--surface-color);
  cursor: pointer;
  margin-bottom: 2rem;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent);
  background: rgba(255, 51, 102, 0.02);
}
.dropzone-icon {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: center;
}
.dropzone-icon svg {
  width: 48px; height: 48px;
  stroke-width: 1.5;
}
.dropzone:hover .dropzone-icon { color: var(--accent); }
.dropzone-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Previews & Actions */
.preview-area {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}
.preview-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  aspect-ratio: 1;
}
.preview-item img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.preview-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.8);
  color: white;
  padding: 0.5rem;
  font-size: 0.75rem;
  text-align: center;
  backdrop-filter: blur(4px);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.action-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

/* Gravity Canvas Game Area */
#game-container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}
#gravity-overlay-text h1 {
  font-size: 5vw;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}
#gravity-overlay-text p {
  font-size: 1.25rem;
  color: var(--text-secondary);
}

/* Favorites Feature */
#favorites-bar {
  background: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  overflow-x: auto;
  white-space: nowrap;
}
.fav-link {
  background: rgba(255, 51, 102, 0.1);
  color: var(--accent);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}
.fav-link:hover {
  background: var(--accent);
  color: white;
}
.fav-btn {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 0.5rem 1rem;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 1rem;
  transition: all 0.2s ease;
}
.fav-btn:hover {
  background: var(--accent);
  color: white;
}