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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background: white;
    min-height: 100vh;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

header {
    border-bottom: 2px solid #e0e0e0;
    padding-bottom: 20px;
    margin-bottom: 30px;
}

header h1 {
    color: #2c3e50;
    margin-bottom: 15px;
}

nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

nav a {
    padding: 10px 20px;
    text-decoration: none;
    color: #555;
    border-radius: 5px;
    transition: all 0.3s;
    border: 1px solid #ddd;
}

nav a:hover {
    background: #f0f0f0;
    color: #2c3e50;
}

nav a.active {
    background: #3498db;
    color: white;
    border-color: #3498db;
}

main {
    margin-bottom: 30px;
}

footer {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    color: #777;
}

/* Dashboard */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.stat-card h3 {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    font-size: 32px;
    font-weight: bold;
}

.recent-activity {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.recent-activity h3 {
    margin-bottom: 15px;
    color: #2c3e50;
}

/* Forms */
.sms-form {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    max-width: 600px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #2c3e50;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: #777;
    font-size: 12px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Alerts */
.alert {
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

table thead {
    background: #f8f9fa;
}

table th,
table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

table th {
    font-weight: 600;
    color: #2c3e50;
}

table tbody tr:hover {
    background: #f8f9fa;
}

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

/* Inbox */
.inbox-controls {
    margin-bottom: 20px;
}

.inline-form {
    display: inline-block;
}

.inline-form select {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-left: 10px;
}

.pagination {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

/* Settings */
.settings-info,
.settings-instructions,
.api-test {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.settings-info h3,
.settings-instructions h3,
.api-test h3 {
    margin-bottom: 15px;
    color: #2c3e50;
}

.settings-info p {
    margin-bottom: 10px;
}

.settings-instructions ol {
    margin-left: 20px;
    margin-bottom: 20px;
}

.settings-instructions li {
    margin-bottom: 10px;
}

.settings-instructions code {
    background: #f4f4f4;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
}

.test-result {
    margin-top: 15px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    nav {
        flex-direction: column;
    }
    
    nav a {
        text-align: center;
    }
    
    table {
        font-size: 14px;
    }
    
    table th,
    table td {
        padding: 8px;
    }
}