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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #2c3e50 0%, #4b6cb7 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: box-shadow 0.3s ease;
}

.container:hover {
    box-shadow: 0 35px 70px rgba(0,0,0,0.15);
}

header {
    background: linear-gradient(135deg, #7c3aed 0%, #9333ea 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
    position: relative;
    overflow: hidden;
}

@media (max-width: 768px) {
    header {
        padding: 30px 20px;
        font-size: 1.8rem;
    }
}

header::after {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(255,255,255,0.15), transparent 70%);
    animation: pulse 6s ease-in-out infinite;
    pointer-events: none;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1) translate(0, 0);
        opacity: 1;
    }
    50% {
        transform: scale(1.2) translate(10%, 10%);
        opacity: 0.6;
    }
}

h1 {
    font-size: 2.8rem;
    margin-bottom: 12px;
    font-weight: 800;
    letter-spacing: 1.2px;
    text-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.85;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.main-content {
    padding: 40px 30px 50px;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    margin-bottom: 40px;
    align-items: center;
    justify-content: space-between;
}

.search-container {
    flex: 1;
    min-width: 280px;
}

#searchInput {
    width: 100%;
    padding: 14px 25px;
    border: 2px solid #cbd5e1;
    border-radius: 50px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.05);
    background-color: #f8fafc;
    color: #1e293b;
}

#searchInput:focus {
    outline: none;
    border-color: #7c3aed;
    box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.3);
    background-color: white;
    color: #1e293b;
}

.filter-container {
    display: flex;
    gap: 20px;
    align-items: center;
}

#categoryFilter {
    padding: 14px 25px;
    border: 2px solid #cbd5e1;
    border-radius: 50px;
    font-size: 1.1rem;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: none;
    color: #1e293b;
}

#categoryFilter:focus {
    outline: none;
    border-color: #7c3aed;
    box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.3);
}

.btn {
    padding: 14px 35px;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    box-shadow: 0 8px 20px rgba(124, 58, 237, 0.3);
    user-select: none;
}

.btn-primary {
    background: linear-gradient(135deg, #7c3aed 0%, #9333ea 100%);
    color: white;
    text-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(124, 58, 237, 0.5);
}

.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.event-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
    cursor: default;
}

.event-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.event-title {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 14px;
    color: #2c3e50;
    letter-spacing: 0.5px;
}

.event-date {
    color: #4facfe;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    font-size: 1.1rem;
}

.event-date::before {
    content: "📅";
    margin-right: 10px;
    font-size: 1.3rem;
}

.event-description {
    color: #555;
    margin-bottom: 20px;
    line-height: 1.6;
    font-size: 1rem;
}

.event-category {
    display: inline-block;
    padding: 7px 18px;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 20px;
    user-select: none;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.category-work { background: #ffeaa7; color: #d63031; }
.category-personal { background: #fd79a8; color: white; }
.category-hobby { background: #00b894; color: white; }
.category-other { background: #a29bfe; color: white; }

.event-actions {
    display: flex;
    gap: 15px;
}

.btn-secondary {
    background: #f8f9fa;
    color: #6c757d;
    border: 1px solid #dee2e6;
    box-shadow: none;
    font-weight: 600;
}

.btn-secondary:hover {
    background: #e9ecef;
}

.btn-danger {
    background: #dc3545;
    color: white;
    box-shadow: none;
    font-weight: 600;
}

.btn-danger:hover {
    background: #c82333;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 20px;
    color: #6c757d;
    font-size: 1.2rem;
    font-weight: 600;
}

.empty-state h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.empty-state p {
    font-size: 1.2rem;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.65);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 25px;
    padding: 45px 40px;
    width: 90%;
    max-width: 520px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

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

@keyframes slideIn {
    from { transform: translateY(-60px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    margin-bottom: 35px;
}

.modal-title {
    font-size: 2rem;
    font-weight: 800;
    color: #2c3e50;
    letter-spacing: 0.5px;
}

.form-group {
    margin-bottom: 25px;
}

.form-label {
    display: block;
    margin-bottom: 10px;
    font-weight: 700;
    color: #2c3e50;
    letter-spacing: 0.3px;
}

.form-input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e1e5e9;
    border-radius: 15px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: inset 0 3px 7px rgba(0,0,0,0.05);
}

.form-input:focus {
    outline: none;
    border-color: #4facfe;
    box-shadow: 0 0 0 5px rgba(79, 172, 254, 0.25);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.modal-actions {
    display: flex;
    gap: 20px;
    justify-content: flex-end;
    margin-top: 40px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-container {
        justify-content: space-between;
    }

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

    .event-actions {
        flex-direction: column;
    }

    .modal-content {
        padding: 30px 20px;
    }

    h1 {
        font-size: 2.2rem;
    }

    #addEventBtn {
        width: 100%;
        padding: 16px 0;
        font-size: 1.2rem;
        border-radius: 12px;
        box-shadow: 0 10px 25px rgba(124, 58, 237, 0.6);
    }
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #4facfe;
    color: white;
    padding: 18px 30px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.25);
    z-index: 1001;
    transform: translateX(400px);
    transition: transform 0.3s ease;
    font-weight: 700;
    letter-spacing: 0.3px;
    user-select: none;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    background: #00b894;
}

.notification.error {
    background: #e17055;
}