/* Global Styles */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    padding: 30px 40px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: 20px;
    margin: 20px 0;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.auth-btn {
    padding: 10px 24px;
    background: var(--surface-color);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
    font-weight: 600;
    display: inline-block;
}

.auth-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.auth-btn.signup {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border: 2px solid transparent;
    color: white;
}

.auth-btn.logout {
    background: var(--danger-color);
    border: 2px solid var(--danger-color);
    color: white;
    cursor: pointer;
}

.title .icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.5));
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Stats Bar */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.stat-item {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Search Section */
.search-section {
    background: var(--surface-color);
    padding: 30px;
    border-radius: 15px;
    margin: 30px 0;
    border: 1px solid var(--border-color);
}

.search-container {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.search-input {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-btn {
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

/* Filter Container */
.filter-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    align-items: end;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.filter-select {
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.reset-btn {
    padding: 12px 25px;
    background: var(--surface-light);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.reset-btn:hover {
    background: var(--danger-color);
    border-color: var(--danger-color);
}

/* Results Section */
.results-section {
    margin: 30px 0;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 15px;
}

.results-header h2 {
    font-size: 1.8rem;
    color: var(--text-primary);
}

.view-toggle {
    display: flex;
    gap: 10px;
}

.view-btn {
    padding: 10px 20px;
    background: var(--surface-color);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.view-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Loading */
.loading {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto 20px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Writeups Grid */
.writeups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
}

.writeups-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Writeup Card */
.writeup-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 25px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.writeup-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.writeup-card:hover::before {
    transform: scaleX(1);
}

.writeup-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.writeup-header {
    margin-bottom: 15px;
}

.writeup-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.writeup-link {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

.writeup-link:hover {
    color: var(--primary-color);
}

.writeup-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.meta-item span:first-child {
    font-weight: 600;
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.tag {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--surface-light);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.tag.bug-tag {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-color);
    border-color: rgba(99, 102, 241, 0.3);
}

.tag.program-tag {
    background: rgba(139, 92, 246, 0.2);
    color: var(--secondary-color);
    border-color: rgba(139, 92, 246, 0.3);
}

.bounty-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 15px;
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.bounty-badge.no-bounty {
    background: rgba(148, 163, 184, 0.2);
    color: var(--text-muted);
    border-color: rgba(148, 163, 184, 0.3);
}

.author-info {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.date-info {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 10px;
}

/* List View Specific Styles */
.writeups-list .writeup-card {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 20px;
    align-items: center;
}

.writeups-list .writeup-content {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.writeups-list .writeup-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* No Results */
.no-results {
    text-align: center;
    padding: 80px 20px;
}

.no-results .icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 20px;
    opacity: 0.5;
}

.no-results h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

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

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin: 50px 0;
    flex-wrap: wrap;
}

.page-btn {
    padding: 14px 28px;
    background: var(--surface-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 700;
    font-size: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-btn:hover:not(:disabled) {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateX(0) scale(1.05);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: var(--surface-light);
}

.page-numbers {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
}

.page-number {
    padding: 12px 18px;
    background: var(--surface-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 700;
    font-size: 1.05rem;
    min-width: 50px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-number:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(99, 102, 241, 0.2);
}

.page-number.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-color: var(--primary-color);
    color: white;
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 20px;
    margin-top: 60px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .search-container {
        flex-direction: column;
    }

    .filter-container {
        grid-template-columns: 1fr;
    }

    .writeups-grid {
        grid-template-columns: 1fr;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .writeups-list .writeup-card {
        grid-template-columns: 1fr;
    }

    .stats-bar {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--surface-light);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Read/Unread Feature Styles */
.read-indicator {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid;
    transition: all 0.3s ease;
    margin-top: 15px;
}

.read-indicator.read {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
    border-color: rgba(16, 185, 129, 0.3);
}

.read-indicator.unread {
    background: rgba(148, 163, 184, 0.2);
    color: var(--text-muted);
    border-color: rgba(148, 163, 184, 0.3);
}

.read-toggle-btn {
    padding: 10px 16px;
    border-radius: 8px;
    border: 2px solid;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 15px;
    background: transparent;
}

.read-toggle-btn.mark-read {
    color: var(--success-color);
    border-color: rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.1);
}

.read-toggle-btn.mark-read:hover {
    background: rgba(16, 185, 129, 0.3);
    border-color: var(--success-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.read-toggle-btn.mark-unread {
    color: var(--text-secondary);
    border-color: rgba(148, 163, 184, 0.4);
    background: rgba(148, 163, 184, 0.1);
}

.read-toggle-btn.mark-unread:hover {
    background: rgba(148, 163, 184, 0.3);
    border-color: var(--text-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(148, 163, 184, 0.3);
}

.read-toggle-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.read-toggle-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Loading state for toggle button */
.read-toggle-btn:disabled::after {
    content: '...';
    animation: dots 1.5s infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}