:root {
    /* Color Palette - Premium Dark Theme */
    --bg-color: hsl(220, 20%, 8%);
    --card-bg: hsla(220, 15%, 15%, 0.8);
    --border-color: hsla(220, 15%, 25%, 0.5);
    --primary-color: hsl(230, 85%, 65%);
    --primary-glow: hsla(230, 85%, 65%, 0.2);
    --text-primary: hsl(0, 0%, 98%);
    --text-secondary: hsl(220, 10%, 70%);
    --accent-success: hsl(150, 80%, 50%);
    --accent-error: hsl(0, 80%, 60%);
    --glass-blur: 16px;
    --border-radius: 20px;
    --transition-standard: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 60px auto;
    padding: 0 24px;
}

/* Header Styling */
header {
    text-align: center;
    margin-bottom: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.logo-container {
    margin-bottom: 24px;
    animation: fadeInDown 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

#app-logo {
    max-width: 280px;
    height: auto;
    filter: drop-shadow(0 0 15px var(--primary-glow));
}

h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -1.5px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
    animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.2s backwards;
}

header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
    animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.4s backwards;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Upload Section */
.upload-section {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.upload-card {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-standard);
    box-shadow: 0 10px 30px -10px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.upload-card:hover, .upload-card.drag-over {
    border-color: var(--primary-color);
    background: hsla(230, 85%, 65%, 0.05);
    box-shadow: 0 0 40px var(--primary-glow);
    transform: translateY(-4px);
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--primary-color);
}

.upload-card h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.upload-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-standard);
}

.btn-primary:hover {
    filter: brightness(1.1);
    box-shadow: 0 8px 20px var(--primary-glow);
    transform: scale(1.05);
}

/* Progress Bar */
.progress-container {
    margin-top: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.progress-bar-wrapper {
    flex-grow: 1;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--primary-color);
    border-radius: 4px;
    transition: width 0.2s ease-out;
}

#progress-text {
    font-size: 0.875rem;
    font-weight: 600;
}

.hidden {
    display: none;
}

/* Gallery Styling */
.gallery-section {
    margin-top: 80px;
}

.gallery-section h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    margin-bottom: 24px;
    border-left: 4px solid var(--primary-color);
    padding-left: 16px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* Gallery Item Styling */
.gallery-item {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition-standard);
}

.gallery-item:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: 0 12px 30px -10px rgba(0,0,0,0.6);
}

.media-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: rgba(255, 255, 255, 0.05);
}

.item-info {
    padding: 16px;
}

.item-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.item-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
}