#split-calc-container {
    --bg: #f5f7fb;
    --card-bg: #ffffff;
    --text: #243040;
    --muted: #667085;
    --border: #dfe4ea;
    --primary: #0073aa;
    --primary-strong: #005b87;
    --success: #00a32a;
    --success-soft: #eefbf1;
    --danger: #d63638;
    --chip-bg: #e1f0ff;
    --chip-text: #0073aa;
    --surface: #f8fafc;
    --surface-2: #eef2f6;
    --tooltip-bg: #fff8e1;
    --tooltip-border: #ffc107;
    --shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text);
    max-width: 520px;
    margin: 20px auto;
    line-height: 1.4;
}

#split-calc-container.dark {
    --bg: #0f172a;
    --card-bg: #111827;
    --text: #e5eef9;
    --muted: #9fb0c7;
    --border: #243247;
    --primary: #38bdf8;
    --primary-strong: #0ea5e9;
    --success: #22c55e;
    --success-soft: #13281d;
    --danger: #fb7185;
    --chip-bg: #132235;
    --chip-text: #8bd3ff;
    --surface: #0b1220;
    --surface-2: #172234;
    --tooltip-bg: #2b2305;
    --tooltip-border: #facc15;
    --shadow: 0 12px 30px rgba(0, 0, 0, 0.32);
}

.calc-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
}

.top-bar h2 {
    margin: 0;
    font-size: 26px;
}

.top-actions {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.compact-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 12px;
    color: var(--muted);
    font-weight: 700;
    text-transform: uppercase;
}

.stepper {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    gap: 5px;
}

.step {
    flex: 1;
    font-size: 11px;
    text-align: center;
    padding: 8px 4px;
    background: var(--surface-2);
    color: var(--muted);
    border-radius: 8px;
    font-weight: bold;
    transition: 0.3s;
}

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

.tooltip {
    background: var(--tooltip-bg);
    border-left: 4px solid var(--tooltip-border);
    padding: 8px 12px;
    font-size: 13px;
    margin-bottom: 20px;
    border-radius: 6px;
}

.section {
    margin-bottom: 20px;
}

.section h3 {
    margin: 0 0 14px;
}

.quick-names-label {
    font-size: 11px;
    color: var(--muted);
    margin: 10px 0 5px;
    font-weight: bold;
    text-transform: uppercase;
}

.input-group {
    display: flex;
    gap: 8px;
}

.input-stack {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.two-col-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

input[type="text"],
input[type="number"],
select {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    background: var(--surface);
    color: var(--text);
    width: 100%;
    box-sizing: border-box;
}

input[type="checkbox"],
input[type="radio"] {
    width: 18px;
    height: 18px;
    margin: 0;
    padding: 0;
    accent-color: var(--primary);
    flex: 0 0 auto;
}

label {
    font-size: 12px;
    font-weight: 700;
    color: var(--muted);
    display: block;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

button {
    padding: 10px 16px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 700;
    transition: 0.2s;
}

button:hover {
    transform: translateY(-1px);
}

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

.btn-primary:active {
    transform: scale(0.98);
    opacity: 0.9;
}

.btn-success {
    background: var(--success);
    color: white;
    width: 100%;
    padding: 14px;
    font-size: 16px;
}

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    width: 100%;
    margin-top: 4px;
    font-size: 12px;
}

.btn-secondary {
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-whatsapp {
    background: #25D366;
    color: white;
    border: none;
}

.btn-whatsapp:hover {
    background: #1ebe5a;
}

.icon-btn {
    white-space: nowrap;
}

.chip-container {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
}

.chip {
    background: var(--chip-bg);
    color: var(--chip-text);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.chip.q-add {
    background: var(--surface-2);
    color: var(--text);
    cursor: pointer;
    border: 1px solid var(--border);
}

.chip.q-add:hover {
    background: var(--surface);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    background: var(--surface);
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.checkbox-item,
.radio-pill {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text);
    font-weight: 600;
    text-transform: none;
    letter-spacing: normal;
    margin: 0;
    cursor: pointer;
}

.checkbox-item {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--card-bg);
    transition: 0.2s ease;
}

.checkbox-item:hover {
    border-color: var(--primary);
    background: var(--surface-2);
}

.checkbox-item:has(input:checked) {
    border-color: var(--primary);
    background: rgba(0, 115, 170, 0.08);
}

#split-calc-container.dark .checkbox-item:has(input:checked) {
    background: rgba(56, 189, 248, 0.12);
}

.split-mode-wrap {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.radio-pill {
    justify-content: center;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    min-height: 48px;
    transition: 0.2s ease;
}

.radio-pill:hover {
    border-color: var(--primary);
    background: var(--surface-2);
}

.radio-pill:has(input:checked) {
    border-color: var(--primary);
    background: rgba(0, 115, 170, 0.08);
    color: var(--primary);
}

#split-calc-container.dark .radio-pill:has(input:checked) {
    background: rgba(56, 189, 248, 0.12);
    color: #8bd3ff;
}

.percentage-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
}

.percentage-row {
    display: grid;
    grid-template-columns: 1fr 120px;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
}

.percentage-row:last-child {
    margin-bottom: 0;
}

.percentage-row span {
    font-weight: 700;
}

.suffix-input {
    position: relative;
}

.suffix-input input {
    padding-right: 30px;
}

.suffix-input strong {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted);
    font-size: 13px;
}

.preview-banner {
    background: linear-gradient(135deg, rgba(0,115,170,0.12), rgba(0,115,170,0.04));
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 13px;
    font-weight: 700;
}

#split-calc-container.dark .preview-banner {
    background: linear-gradient(135deg, rgba(56,189,248,0.18), rgba(56,189,248,0.06));
}

.total-banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface-2);
    color: var(--text);
    padding: 12px 15px;
    border-radius: 10px;
    margin-bottom: 15px;
    font-weight: bold;
    font-size: 15px;
    border: 1px solid var(--border);
}

#total-bill-amount {
    color: var(--success);
    font-size: 18px;
}

.history-list {
    font-size: 13px;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.history-card {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
    border-top: 1px dashed var(--border);
}

.history-card:first-child {
    border-top: none;
}

.history-meta {
    color: var(--muted);
    font-size: 12px;
    margin-top: 4px;
}

.settlement-header {
    font-weight: bold;
    margin: 15px 0 8px;
    font-size: 14px;
}

.settlement-box {
    background: var(--success-soft);
    padding: 15px;
    border-radius: 10px;
    border: 1px dashed var(--success);
    font-size: 14px;
    line-height: 1.6;
}

.balance-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 14px;
    gap: 10px;
}

.pos {
    color: var(--success);
    font-weight: bold;
}

.neg {
    color: var(--danger);
    font-weight: bold;
}

.button-stack {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.export-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
}

.full-width {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

@media (max-width: 560px) {
    .top-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .top-actions {
        justify-content: stretch;
    }

    .two-col-grid,
    .export-grid,
    .split-mode-wrap,
    .percentage-row,
    .checkbox-grid {
        grid-template-columns: 1fr;
    }

    .input-group {
        flex-direction: column;
    }
}