/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 1rem;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

/* Header */
header {
    background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
    color: white;
    padding: 1.5rem;
    text-align: center;
}

header h1 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Status Messages */
.status-message {
    padding: 1rem;
    margin: 1rem;
    border-radius: 8px;
    font-weight: 500;
    text-align: center;
}

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

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

.status-message.hidden {
    display: none;
}

/* Form Sections */
.form-section {
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
}

.form-section:last-child {
    border-bottom: none;
}

.form-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

/* Form Groups */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: #4a5568;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: #718096;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    width: 100%;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: #e2e8f0;
    color: #2d3748;
}

.btn-secondary:hover {
    background: #cbd5e0;
}

.btn-danger {
    background: #fc8181;
    color: white;
}

/* Location Display */
.location-display {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: #edf2f7;
    border-radius: 6px;
}

.location-display.hidden {
    display: none;
}

/* Offline Notice */
.offline-notice {
    text-align: center;
    color: #d69e2e;
    font-size: 0.875rem;
    margin-top: 1rem;
}

.offline-notice.hidden {
    display: none;
}

/* Observation Entry */
.observation-entry {
    background: #f7fafc;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 2px solid #e2e8f0;
}

.observation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.observation-number {
    font-weight: 600;
    color: #4a5568;
}

.btn-remove {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    width: auto;
}

/* Responsive */
@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }

    body {
        padding: 0;
    }

    .container {
        border-radius: 0;
    }
}

/* Utility */
.hidden {
    display: none;
}