/* Base styles & Variables */
:root {
    --bg-dark: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(12px);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.6;
}

/* Abstract Background Blobs */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    filter: blur(100px);
    border-radius: 50%;
    opacity: 0.5;
    animation: float 20s infinite alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: #3b82f6;
}

.blob-2 {
    bottom: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: #8b5cf6;
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(5%, 10%) scale(1.1); }
    100% { transform: translate(-5%, -5%) scale(0.9); }
}

/* Layout Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* Header Section */
.header {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

.header h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.header h1 span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

.login-shortcut {
    position: absolute;
    top: -2rem;
    right: 0;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--card-border);
    border-radius: 20px;
    background: rgba(255,255,255,0.05);
    transition: var(--transition);
}

.login-shortcut:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.3);
}

/* Search Bar (Glassmorphism) */
.search-wrapper {
    position: relative;
    max-width: 500px;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    left: 1.2rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

.search-wrapper input {
    width: 100%;
    padding: 1.2rem 1.2rem 1.2rem 3.5rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: 50px;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    outline: none;
    transition: var(--transition);
}

.search-wrapper input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.search-wrapper input:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* Assignments Grid */
.assignments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

/* Card Styles */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transition: var(--transition);
    transform: translateY(0);
}

.card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 20px rgba(59, 130, 246, 0.2);
}

.card-image-container {
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.card-image-container::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(to top, var(--card-bg), transparent);
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card:hover .card-image {
    transform: scale(1.05);
}

.card-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card-title {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-date {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
    font-weight: 300;
}

.card-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.view-btn {
    text-decoration: none;
    color: white;
    font-weight: 500;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: 12px;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.view-btn:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.1);
}

.sol-btn {
    background: var(--accent-gradient);
    border: none;
}

.sol-btn:hover {
    background: var(--accent-gradient);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.3);
}

.lec-btn {
    color: var(--text-secondary);
}

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

/* Utility Classes */
.hidden {
    display: none !important;
}

.no-results {
    text-align: center;
    padding: 4rem 0;
}

.no-results h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.no-results p {
    color: var(--text-secondary);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2.5rem;
    }
    
    .container {
        padding: 2rem 1.5rem;
    }
    
    .assignments-grid {
        grid-template-columns: 1fr;
    }
}