/* ===========================
   CSS Reset & Global Styles
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===========================
   Header Styles
   =========================== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 60px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.header-content {
    position: relative;
    z-index: 1;
}

.main-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    animation: fadeInDown 0.8s ease-out;
}

.subtitle {
    font-size: 1.25rem;
    font-weight: 300;
    margin-bottom: 12px;
    opacity: 0.95;
    animation: fadeInDown 0.8s ease-out 0.2s both;
}

.author {
    font-size: 1rem;
    font-weight: 400;
    opacity: 0.9;
    animation: fadeInDown 0.8s ease-out 0.4s both;
}

/* ===========================
   Search Section
   =========================== */
.search-section {
    margin-top: -40px;
    margin-bottom: 40px;
    position: relative;
    z-index: 10;
}

.search-wrapper {
    max-width: 600px;
    margin: 0 auto 16px;
}

.search-input {
    width: 100%;
    padding: 16px 24px;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--card-bg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    outline: none;
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-xl), 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

.search-input::placeholder {
    color: var(--text-secondary);
}

.filter-info {
    text-align: center;
}

.project-count {
    display: inline-block;
    padding: 8px 20px;
    background: var(--card-bg);
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

/* ===========================
   Projects Grid
   =========================== */
.main-content {
    flex: 1;
    padding: 20px 0 60px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
    animation: fadeIn 0.6s ease-out;
}

/* ===========================
   Project Card
   =========================== */
.project-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.6s ease-out both;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.card-content {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-day {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 12px;
    margin-bottom: 12px;
    width: fit-content;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
    line-height: 1.4;
    flex: 1;
}

.card-button {
    display: inline-block;
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    text-align: center;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
}

.card-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.card-button:active {
    transform: translateY(0);
}

/* ===========================
   Loading & Empty States
   =========================== */
.loading-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

.no-results {
    padding: 80px 20px;
    text-align: center;
}

.no-results-content {
    max-width: 400px;
    margin: 0 auto;
}

.no-results-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 16px;
    opacity: 0.5;
}

.no-results h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

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

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 32px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: auto;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Stagger animation for cards */
.project-card:nth-child(1) { animation-delay: 0.05s; }
.project-card:nth-child(2) { animation-delay: 0.1s; }
.project-card:nth-child(3) { animation-delay: 0.15s; }
.project-card:nth-child(4) { animation-delay: 0.2s; }
.project-card:nth-child(5) { animation-delay: 0.25s; }
.project-card:nth-child(6) { animation-delay: 0.3s; }

/* ===========================
   Responsive Design
   =========================== */

/* Tablets */
@media (max-width: 1024px) {
    .main-title {
        font-size: 2.5rem;
    }
    
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 24px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .header {
        padding: 40px 0 60px;
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .search-section {
        margin-top: -30px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .container {
        padding: 0 16px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .main-title {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 0.95rem;
    }
}

/* ===========================
   Accessibility
   =========================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
.search-input:focus-visible,
.card-button:focus-visible,
.footer a:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}