:root {
    --primary-green: #42b746;
    --background-gray: #f8fafc;
    --border-color: #e2e8f0;
    --text-dark: #1e293b;
    --text-muted: #64748b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--background-gray);
    color: var(--text-dark);
    margin: 0;
    padding: 20px;
}

.inbox-container {
    max-width: 800px;
    margin: 0 auto;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    overflow: hidden;
}

.inbox-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

/* Back Button Styles */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 12px;
    transition: color 0.2s ease, transform 0.2s ease;
}

.back-btn:hover {
    color: var(--primary-green);
    transform: translateX(-2px); /* Subtle nudge effect when hovering */
}

.inbox-header h1 {
    margin: 0 0 4px 0;
    font-size: 1.75rem;
    color: var(--text-dark);
}

.inbox-header p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Tabs Navigation */
.inbox-tabs {
    display: flex;
    background: #f1f5f9;
    padding: 4px;
    gap: 4px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.tab-btn.active {
    background: #ffffff;
    color: var(--primary-green);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Panels */
.tab-panel {
    display: none;
    padding: 24px;
}

.tab-panel.active-panel {
    display: block;
}

/* Card Elements */
.inbox-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.inbox-card:hover {
    transform: translateY(-1px);
    border-color: #cbd5e1;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.badge {
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: bold;
    font-size: 0.75rem;
}

.badge-comment { background: #e0f2fe; color: #0369a1; }
.badge-reaction { background: #fef3c7; color: #b45309; }
.badge-feedback { background: #dcfce7; color: #15803d; }

.card-body {
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-dark);
}

/* Submission Form Block */
.feedback-submission-card {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 24px;
}

.feedback-submission-card h3 {
    margin: 0 0 12px 0;
    font-size: 1.1rem;
}

.form-group textarea {
    width: 100%;
    height: 80px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    resize: vertical;
    box-sizing: border-box;
    margin-bottom: 10px;
}

.submit-btn {
    background: var(--primary-green);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.submit-btn:hover {
    opacity: 0.9;
}

.loading-placeholder, .empty-placeholder {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 0;
    margin: 0;
}