:root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --primary: #25d366;
    --primary-dark: #1ea85a;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.container {
    max-width: 1100px;
    margin: 40px auto;
    padding: 20px;
}

.topbar {
    margin-bottom: 24px;
}

.topbar h1 {
    margin: 0;
    font-size: 2.2rem;
}

.topbar p {
    color: var(--muted);
    margin-top: 8px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(260px, 1fr));
    gap: 20px;
}

.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 20px;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.03);
}

.card.wide {
    grid-column: 1 / -1;
}

input[type="file"], textarea, button {
    width: 100%;
    margin-top: 12px;
}

textarea {
    min-height: 120px;
    resize: vertical;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
    font-size: 1rem;
}

button {
    border: 0;
    border-radius: 10px;
    padding: 12px 18px;
    font-weight: 600;
    cursor: pointer;
}

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

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

button.secondary {
    background: #eef2ff;
    color: #1f2937;
}

.preview-box, .status-box {
    border: 1px dashed var(--border);
    border-radius: 10px;
    min-height: 120px;
    padding: 16px;
    color: var(--muted);
    background: #fafafa;
    margin-top: 12px;
}

.status-box {
    min-height: auto;
    color: var(--text);
    background: #f0fdf4;
}

.status-box.loading {
    background: #fff7ed;
    color: #9a5b00;
}

.status-box.success {
    background: #f0fdf4;
    color: #166534;
}

.status-box.error {
    background: #fef2f2;
    color: #991b1b;
}

button:disabled {
    opacity: 0.7;
    cursor: wait;
}

.contact-row {
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
}

.contact-row:last-child {
    border-bottom: none;
}