:root {
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --secondary-color: #06B6D4;
    --text-color: #1F2937;
    --text-light: #6B7280;
    --border-color: #E5E7EB;
    --bg-light: #F9FAFB;
    --success-color: #10B981;
    --error-color: #EF4444;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-color);
    background-color: #fff;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

nav a {
    margin-left: 2rem;
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--primary-color);
}

/* Main Content */
main {
    padding: 3rem 20px;
    min-height: calc(100vh - 200px);
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.event-form-container {
    max-width: 700px;
    margin: 0 auto;
}

.two-column-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
    align-items: start;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group label .required {
    color: var(--error-color);
}

.form-group input[type="text"],
.form-group input[type="datetime-local"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

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

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.datetime-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.3s, transform 0.1s;
}

.btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-block {
    width: 100%;
    text-align: center;
}

.btn-secondary {
    background-color: #6B7280;
}

.btn-secondary:hover {
    background-color: #4B5563;
}

.calendar-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.calendar-link {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.3s;
}

.calendar-link:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Event Info Display */
.event-info {
    margin-bottom: 2rem;
}

.event-info h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.event-details {
    display: grid;
    gap: 1rem;
}

.event-detail-item {
    display: flex;
    align-items: start;
    gap: 0.75rem;
}

.event-detail-item .icon {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

/* Link Display */
.link-display {
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
}

.link-input-group {
    display: flex;
    gap: 0.5rem;
}

.link-input-group input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.875rem;
    background-color: white;
}

.copy-btn {
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background-color 0.3s;
}

.copy-btn:hover {
    background-color: var(--primary-dark);
}

.copy-btn.copied {
    background-color: var(--success-color);
}

/* Ads */
.ad-sidebar {
    position: sticky;
    top: 100px;
}

.ad-footer {
    margin: 2rem 0;
    padding: 1rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    text-align: center;
}

.ad-placeholder {
    background-color: var(--bg-light);
    border: 2px dashed var(--border-color);
    padding: 2rem;
    text-align: center;
    border-radius: 8px;
    color: var(--text-light);
}

/* Alert Messages */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.alert-success {
    background-color: #D1FAE5;
    border: 1px solid #10B981;
    color: #065F46;
}

.alert-error {
    background-color: #FEE2E2;
    border: 1px solid #EF4444;
    color: #991B1B;
}

.alert-info {
    background-color: #DBEAFE;
    border: 1px solid #3B82F6;
    color: #1E40AF;
}

/* Footer */
footer {
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    text-align: center;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    margin: 0 1rem;
    color: var(--text-light);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 2rem;
    }
    
    .two-column-layout {
        grid-template-columns: 1fr;
    }
    
    .datetime-inputs {
        grid-template-columns: 1fr;
    }
    
    nav a {
        margin-left: 1rem;
    }
    
    .calendar-links {
        flex-direction: column;
    }
    
    .calendar-link {
        justify-content: center;
    }
}

/* Utilities */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }