:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --bg: #f4f6fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg);
    margin: 0;
    color: var(--text);
}

.container {
    max-width: 980px;
    margin: 40px auto;
    padding: 0 16px;
}

h1 {
    margin-bottom: 20px;
    font-size: 26px;
    font-weight: 600;
}

/* CARD */
.card {
    background-color: var(--card);
    padding: 24px;
    border-radius: 14px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.06);
}

/* GRID */
.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

/* FORM */
.row {
    margin-bottom: 16px;
}

label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}

input[type="text"],
input[type="number"],
input[type="file"],
textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-size: 14px;
    transition: all 0.2s ease;
}

textarea {
    resize: vertical;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* CHECKBOX */
input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
}

/* ALERT */
.success {
    background-color: #ecfdf5;
    color: #065f46;
    border-left: 4px solid var(--success);
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.error {
    margin-top: 6px;
    color: var(--danger);
    font-size: 13px;
}

/* ACTIONS */
.actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.btn {
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    background-color: var(--primary);
    color: #fff;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn.secondary {
    background-color: #6b7280;
}

.btn.secondary:hover {
    background-color: #4b5563;
}

.row img {
    width: 100px;
    height: auto;
    object-fit: fill;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .grid {
        grid-template-columns: 1fr;
        gap: 0;
    }
}