:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --bg-color: #F3F4F6;
    --card-bg: #FFFFFF;
    --text-main: #111827;
    --text-muted: #6B7280;
    --border-color: #E5E7EB;
    --success-bg: #D1FAE5;
    --success-text: #065F46;
    --error-bg: #FEE2E2;
    --error-text: #991B1B;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
    min-height: 100vh;
}

.container {
    background-color: var(--card-bg);
    max-width: 600px;
    width: 100%;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.admin-container {
    max-width: 800px;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-align: center;
}

p.subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

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

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

input[type="text"],
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background-color: #F9FAFB;
}

input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
    background-color: #FFF;
}

button {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--primary-hover);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    text-align: center;
}

.alert.success {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.alert.error {
    background-color: var(--error-bg);
    color: var(--error-text);
}

/* Admin View Styles */
.feedback-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    background-color: #F9FAFB;
}

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

.feedback-topic {
    font-weight: 600;
    font-size: 1.1rem;
}

.feedback-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.feedback-message {
    color: var(--text-main);
    line-height: 1.6;
    white-space: pre-wrap;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
}

.nav-link {
    display: block;
    text-align: center;
    margin-top: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
}

.nav-link:hover {
    text-decoration: underline;
}