*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #472A00;
    --surface: burlywood;
    --lightest: #FFEBD6;
    --border: gold;
    --text: #472A00;
    --text-muted: #4D2D00;
    --primary: #3b82f6;
    --danger: #f4511e;
    --success: #22c55e;
    --radius: 6px;
    --gap: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    padding: var(--gap);
}

h1 {
    font-size: 1.6rem;
    color: var(--surface);
    text-align: center;
    margin-bottom: var(--gap);
}

h2 {
    font-size: 1rem;
    margin-bottom: 8px;
}

h3 {
    font-size: 0.9rem;
    margin-bottom: 6px;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--gap);
    margin-bottom: var(--gap);
}

/* Form rows */
.field-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.field-row label {
    min-width: 100px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.field-row input,
.field-row select {
    flex: 1;
    min-width: 0;
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
}

.field-row .or-label {
    min-width: unset;
    flex: 0 0 auto;
    white-space: nowrap;
}

.field-row input:disabled {
    opacity: 0.45;
    background: #e6d3b8;
}

input[type="number"] {
    background-color: var(--lightest);
    -moz-appearance: textfield;
}

select {
    background: var(--lightest);
}

/* Buttons */
button {
    padding: 6px 14px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.85rem;
    cursor: pointer;
    background: var(--bg);
    color: white;
}

button:active {
    opacity: 0.85;
}

button.danger {
    background: var(--danger);
}

button.small {
    padding: 4px 10px;
    font-size: 0.8rem;
}

.logo-text {
    font-size: 1.5rem;
    color: var(--surface);
}

/* Summary */
.summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    font-size: 1rem;
}

.summary .label {
    color: var(--text-muted);
}

.summary .value {
    text-align: right;
    font-weight: 600;
}

.warning-text {
    color: gold;
    text-align: center;
    padding-bottom: 16px;
}

/* Canvas */
.canvas-wrap {
    display: flex;
    justify-content: center;
    margin: var(--gap) 0;
}

canvas {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    max-width: 100%;
    height: auto;
}

/* Loss list */
.loss-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px;
    margin-bottom: 8px;
}

.loss-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.loss-header span {
    font-weight: 600;
    font-size: 0.9rem;
}

/* Add loss bar */
.add-loss-bar {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.add-loss-bar select {
    flex: 1;
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
}

/* Error */
.error-msg {
    color: var(--danger);
    font-size: 0.8rem;
    margin-top: 4px;
}

/* Per-field validation error text — always below its input */
.field-group {
    margin-bottom: 4px;
}

.field-error {
    color: var(--danger);
    font-size: 0.75rem;
    margin: 2px 0 6px 0;
    padding-left: 108px;
}

/* Red border on invalid inputs */
.input-error {
    border-color: var(--danger) !important;
    outline-color: var(--danger);
}

/* Loss item with geometry error gets a subtle red left border */
.loss-invalid {
    border: 3px solid var(--danger);
}

/* Responsive */
@media (max-width: 480px) {
    body { padding: 8px; }
    .field-row label { min-width: 80px; }
    .field-error { padding-left: 88px; }
}