/* ===== CSS RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Core palette */
    --bg-primary: #0c0e14;
    --bg-secondary: #12151e;
    --bg-card: rgba(20, 24, 36, 0.75);
    --bg-card-hover: rgba(26, 31, 48, 0.85);
    --border-card: rgba(99, 102, 241, 0.12);
    --border-hover: rgba(99, 102, 241, 0.25);

    /* Text */
    --text-primary: #e8eaf0;
    --text-secondary: #8b92a8;
    --text-muted: #5a6077;

    /* Accents */
    --accent-indigo: #6366f1;
    --accent-violet: #8b5cf6;
    --accent-emerald: #34d399;
    --accent-rose: #f43f5e;
    --accent-amber: #fbbf24;
    --accent-sky: #38bdf8;

    /* Gradients */
    --grad-primary: linear-gradient(135deg, #6366f1, #8b5cf6);
    --grad-success: linear-gradient(135deg, #34d399, #10b981);
    --grad-danger: linear-gradient(135deg, #f43f5e, #e11d48);
    --grad-cash: linear-gradient(135deg, #34d399 0%, #059669 100%);
    --grad-finance: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 24px rgba(0,0,0,0.35);
    --shadow-lg: 0 8px 48px rgba(0,0,0,0.45);
    --shadow-glow: 0 0 60px rgba(99,102,241,0.1);

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Animated background */
.app-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(ellipse 60% 50% at 20% 10%, rgba(99,102,241,0.08) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 80% 80%, rgba(139,92,246,0.06) 0%, transparent 60%),
        radial-gradient(ellipse 40% 30% at 50% 50%, rgba(52,211,153,0.04) 0%, transparent 60%);
    animation: bgPulse 12s ease-in-out infinite alternate;
}

@keyframes bgPulse {
    0% { opacity: 0.7; }
    100% { opacity: 1; }
}

/* ===== HEADER ===== */
header {
    padding: 2rem 1.5rem 1.5rem;
    text-align: center;
}

.header-content {
    max-width: 600px;
    margin: 0 auto;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* ===== MAIN ===== */
main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem 4rem;
}

/* ===== CARD BASE ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(16px);
    transition: border-color 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out), transform 0.35s var(--ease-out);
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 1.25rem 1.5rem 0;
}

.card-icon {
    font-size: 1.3rem;
}

.card-header h2 {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.card-body {
    padding: 1rem 1.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* ===== INPUTS GRID ===== */
.inputs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 2rem;
}

/* ===== FIELDS ===== */
.field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.field label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.input-group {
    display: flex;
    align-items: center;
    background: rgba(0,0,0,0.25);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color 0.25s, box-shadow 0.25s;
}

.input-group:focus-within {
    border-color: var(--accent-indigo);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

.input-group .prefix,
.input-group .suffix {
    padding: 0 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    user-select: none;
    flex-shrink: 0;
}

.input-group input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    padding: 0.7rem 0.75rem;
    min-width: 0;
}

.input-group input::placeholder {
    color: var(--text-muted);
}

/* Info boxes */
.info-box {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    background: rgba(99,102,241,0.06);
    border: 1px solid rgba(99,102,241,0.1);
    color: var(--text-secondary);
    font-size: 0.78rem;
    line-height: 1.45;
}

.info-box svg {
    flex-shrink: 0;
    margin-top: 1px;
    color: var(--accent-indigo);
    opacity: 0.7;
}

/* Custom checkbox */
.checkbox-field {
    gap: 0 !important;
}

.checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    user-select: none;
    transition: color 0.2s;
}

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

.checkbox-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkbox-custom {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 1.5px solid rgba(255,255,255,0.15);
    background: rgba(0,0,0,0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
    position: relative;
}

.checkbox-custom::after {
    content: '';
    width: 10px;
    height: 5px;
    border-left: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(-45deg) scale(0);
    transition: transform 0.2s var(--ease-out);
    position: absolute;
    top: 3px;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
    background: var(--accent-indigo);
    border-color: var(--accent-indigo);
    box-shadow: 0 0 8px rgba(99,102,241,0.3);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
    transform: rotate(-45deg) scale(1);
}

.checkbox-label input[type="checkbox"]:focus-visible + .checkbox-custom {
    box-shadow: 0 0 0 3px rgba(99,102,241,0.25);
}

/* ===== CALCULATE BUTTON ===== */
.btn-calculate {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 0 auto;
    padding: 0.9rem 2.5rem;
    background: var(--grad-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-xl);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
    box-shadow: 0 4px 20px rgba(99,102,241,0.35);
}

.btn-calculate:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 30px rgba(99,102,241,0.5);
}

.btn-calculate:active {
    transform: translateY(0) scale(0.98);
}

.inputs-section {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ===== RESULTS SECTION ===== */
.results-section {
    margin-top: 3rem;
    animation: fadeInUp 0.6s var(--ease-out) both;
    display: none;
}

.results-section.visible {
    display: block;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Winner Banner */
.winner-banner {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem 2rem;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    backdrop-filter: blur(16px);
    position: relative;
    overflow: hidden;
}

.winner-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0.1;
}

.winner-banner.cash-wins::before {
    background: var(--grad-cash);
}

.winner-banner.finance-wins::before {
    background: var(--grad-finance);
}

.winner-banner.tie::before {
    background: linear-gradient(135deg, var(--accent-amber), var(--accent-amber));
}

.winner-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
    animation: bounce 1s var(--ease-out);
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    30% { transform: translateY(-12px); }
    60% { transform: translateY(-4px); }
}

.winner-text h2 {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.01em;
}

.winner-text p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.15rem;
}

.winner-text strong {
    color: var(--accent-emerald);
    font-weight: 700;
}

.winner-banner.cash-wins .winner-text h2 {
    color: var(--accent-emerald);
}

.winner-banner.finance-wins .winner-text h2 {
    color: var(--accent-indigo);
}

/* Comparison Grid */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(16px);
    overflow: hidden;
    transition: border-color 0.35s, box-shadow 0.35s;
}

.result-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.result-card-header {
    padding: 1.25rem 1.5rem 0.5rem;
}

.result-card-header h3 {
    font-size: 1.05rem;
    font-weight: 700;
}

.result-card-body {
    padding: 0.5rem 1.5rem 1.5rem;
}

.big-number {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-top: 0.25rem;
}

.cash-card .big-number {
    background: var(--grad-cash);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.finance-card .big-number {
    background: var(--grad-finance);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.big-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.result-details {
    margin-top: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 0.25rem 0;
}

.detail-row span:last-child {
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.detail-row.total-row {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 0.65rem;
    margin-top: 0.25rem;
}

.detail-row.total-row span {
    font-weight: 700;
    font-size: 0.95rem;
}

.detail-row.emphasis span:last-child {
    font-size: 1.1rem;
}

.detail-row.muted {
    opacity: 0.6;
    font-size: 0.8rem;
}

.positive {
    color: var(--accent-emerald) !important;
}

.negative {
    color: var(--accent-rose) !important;
}

/* ===== CHART CARD ===== */
.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(16px);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.chart-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.chart-container {
    position: relative;
    width: 100%;
    height: 320px;
}

.chart-container canvas {
    width: 100% !important;
    height: 100% !important;
}

.chart-legend {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.invest {
    background: var(--accent-indigo);
}

.legend-dot.loan {
    background: var(--accent-rose);
}

/* ===== TABLE CARD ===== */
.table-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(16px);
    padding: 1.5rem;
}

.table-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0;
}

.table-header-row h3 {
    font-size: 1.05rem;
    font-weight: 700;
}

.btn-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: rgba(99,102,241,0.1);
    color: var(--accent-indigo);
    border: 1px solid rgba(99,102,241,0.2);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}

.btn-toggle:hover {
    background: rgba(99,102,241,0.18);
    border-color: rgba(99,102,241,0.35);
}

.btn-toggle svg {
    transition: transform 0.3s var(--ease-out);
}

.btn-toggle.expanded svg {
    transform: rotate(180deg);
}

.table-wrapper {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s var(--ease-out);
}

.table-wrapper.expanded {
    max-height: 3000px;
    margin-top: 1rem;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
    font-variant-numeric: tabular-nums;
}

thead th {
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    padding: 0.7rem 0.8rem;
    text-align: right;
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

thead th:first-child {
    text-align: center;
}

tbody td {
    padding: 0.55rem 0.8rem;
    text-align: right;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255,255,255,0.03);
}

tbody td:first-child {
    text-align: center;
    font-weight: 600;
    color: var(--text-muted);
}

tbody tr:hover {
    background: rgba(99,102,241,0.04);
}

tbody tr:last-child td {
    font-weight: 700;
    color: var(--text-primary);
    border-top: 1px solid rgba(255,255,255,0.08);
    border-bottom: none;
}

/* ===== FOOTER ===== */
footer {
    text-align: center;
    padding: 2rem 1.5rem 3rem;
    color: var(--text-muted);
    font-size: 0.8rem;
}

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

    .comparison-grid {
        grid-template-columns: 1fr;
    }

    .winner-banner {
        flex-direction: column;
        text-align: center;
    }

    .chart-container {
        height: 240px;
    }

    .chart-legend {
        flex-direction: column;
        align-items: center;
    }

    .big-number {
        font-size: 1.6rem;
    }

    header {
        padding: 1.5rem 1rem 1rem;
    }
}

@media (max-width: 480px) {
    main {
        padding: 0 1rem 3rem;
    }

    .card-body {
        padding: 0.75rem 1rem 1.25rem;
    }

    .result-card-body {
        padding: 0.5rem 1rem 1.25rem;
    }

    .table-card, .chart-card {
        padding: 1rem;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.2);
}