:root {
    --bg-color: #0F172A;
    /* Slate 900 */
    --panel-bg: rgba(30, 41, 59, 0.7);
    /* Slate 800 with opacity */
    --panel-border: rgba(255, 255, 255, 0.1);

    --primary: #10B981;
    /* Emerald 500 */
    --primary-hover: #059669;
    /* Emerald 600 */
    --primary-glow: rgba(16, 185, 129, 0.2);

    --accent: #3B82F6;
    /* Blue 500 */
    --accent-glow: rgba(59, 130, 246, 0.15);

    --text-main: #F8FAFC;
    /* Slate 50 */
    --text-muted: #94A3B8;
    /* Slate 400 */

    --divider: rgba(255, 255, 255, 0.1);

    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
    /* Subtle radial gradient background */
    background-image: radial-gradient(circle at top right, var(--primary-glow) 0%, transparent 40%),
        radial-gradient(circle at bottom left, var(--accent-glow) 0%, transparent 40%);
}

.app-container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Glassmorphism Panel Base */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #ffffff, var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.btn-lang {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: var(--transition);
}

.btn-lang:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Main Grid */
.main-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.results-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
        "emp emr"
        "sum sum";
    gap: 1.5rem;
    transition: var(--transition);
    opacity: 1;
    transform: translateY(0);
}

.results-container.hidden {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    position: absolute;
    visibility: hidden;
}

/* Forms & Inputs */
.input-section {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

.currency-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
    font-weight: 500;
}

input[type="text"],
select {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-md);
    color: var(--text-main);
    padding: 0.875rem 1rem;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    -moz-appearance: textfield;
}

input[type="text"] {
    padding-left: 2.75rem;
    /* space for Rp */
    font-weight: 600;
    letter-spacing: 1px;
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

select option {
    background: var(--bg-color);
    color: var(--text-main);
}

input[type="text"]:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

/* Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.btn {
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    flex: 2;
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px var(--primary-glow);
}

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

.btn-primary:active {
    transform: translateY(1px);
}

.btn-secondary {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid var(--panel-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Layout areas */
.employee-card {
    grid-area: emp;
}

.employer-card {
    grid-area: emr;
}

.summary-card {
    grid-area: sum;
}

/* Cards internals */
.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
}

.text-primary {
    color: var(--primary);
}

.text-accent {
    color: var(--accent);
}

.breakdown-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.breakdown-list li {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.breakdown-list .value {
    color: var(--text-main);
    font-family: 'Inter', monospace;
    font-weight: 500;
}

.divider-top {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--divider);
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.total-label {
    font-size: 0.875rem;
    font-weight: 600;
}

.total-value {
    font-size: 1.125rem;
    font-weight: 700;
    font-family: 'Inter', monospace;
}

/* Summary Layout */
.summary-card {
    display: flex;
    flex-direction: column;
}

.summary-toggle {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-md);
    padding: 0.25rem;
    margin-bottom: 1.5rem;
    width: max-content;
}

.toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.toggle-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.15);
}

.summary-row.highlight {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.summary-row.highlight .summary-value {
    color: var(--primary);
}

.summary-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'Inter', monospace;
}

.font-medium {
    font-weight: 500;
}

.mt-2 {
    margin-top: 0.5rem;
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
        padding: 0;
    }

    .glass-panel {
        background: white;
        border: 1px solid #ddd;
        box-shadow: none;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    .header h1,
    .header p,
    .text-muted,
    .value,
    select,
    input {
        color: black !important;
        -webkit-text-fill-color: black;
    }

    .btn-lang,
    .action-buttons,
    .summary-toggle {
        display: none !important;
    }

    .results-container {
        display: block;
        /* Avoid grid print issues */
    }

    .breakdown-card {
        page-break-inside: avoid;
        margin-bottom: 20px;
    }

    .highlight {
        background: #f0fdf4 !important;
        border-color: #bbf7d0 !important;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .results-container {
        grid-template-columns: 1fr;
        grid-template-areas:
            "emp"
            "emr"
            "sum";
    }

    .action-buttons {
        flex-direction: column;
    }

    .summary-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .summary-value {
        align-self: flex-end;
    }
}