@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --bg-gradient: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-border: rgba(255, 255, 255, 0.5);
    --text-main: #1f2937;
    --text-muted: #6b7280;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-main);
    min-height: 100vh;
}

/* Glassmorphism Cards */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
}

.card-header {
    background: rgba(255, 255, 255, 0.5);
    border-bottom: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
}

/* Buttons */
.btn-primary {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(99, 102, 241, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(to right, var(--primary-hover), #7c3aed);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(99, 102, 241, 0.35);
}

.btn-success {
    background: linear-gradient(to right, #10b981, #059669);
    border: none;
    box-shadow: 0 4px 6px rgba(16, 185, 129, 0.25);
    transition: all 0.3s ease;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(16, 185, 129, 0.35);
}

/* Form Controls */
.form-control {
    border-radius: 8px;
    border: 1px solid #d1d5db;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.9);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

/* List Groups (Topic Items) */
.list-group-item {
    background: transparent;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: all 0.2s ease;
    padding: 1.25rem 1.5rem;
}

.list-group-item:last-child {
    border-bottom: none;
}

.list-group-item:hover {
    background: rgba(255, 255, 255, 0.95);
    transform: scale(1.01);
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
    z-index: 1;
    border-radius: 8px;
}

/* Links */
a {
    color: var(--primary-color);
    transition: color 0.2s ease;
}
a:hover {
    color: var(--primary-hover);
}

/* Topic Title */
h1.text-primary {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

/* Pagination */
.pagination .page-link {
    border-radius: 8px;
    margin: 0 4px;
    border: none;
    color: var(--text-main);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.2s ease;
}

.pagination .page-item.active .page-link {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 8px rgba(99, 102, 241, 0.3);
}

.pagination .page-link:hover:not(.active) {
    background: #e0e7ff;
    color: var(--primary-hover);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.container {
    animation: fadeIn 0.6s ease-out;
}

/* Badges */
.badge {
    padding: 0.5em 0.8em;
    font-weight: 500;
}
.bg-secondary {
    background-color: #f3f4f6 !important;
    color: var(--text-muted) !important;
    border: 1px solid #e5e7eb;
}