:root {
    /* Light Theme */
    --primary: #0f172a;
    --primary-light: #1e293b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --danger: #ef4444;
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --text-main: #0f172a;
    --text-sub: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --font-main: 'Plus Jakarta Sans', sans-serif;
    --sidebar-width: 320px;
}

[data-theme="dark"] {
    /* Dark Theme */
    --primary: #f8fafc;
    --primary-light: #e2e8f0;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --success: #34d399;
    --success-bg: rgba(16, 185, 129, 0.1);
    --danger: #f87171;
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-hover: #334155;
    --text-main: #f8fafc;
    --text-sub: #94a3b8;
    --border: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: var(--font-main);
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, color 0.3s;
}

/* --- Layout --- */
.app-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Mobile Header (Hamburger + Brand) */
.mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.menu-btn:hover {
    background: var(--surface-hover);
    border-radius: 8px;
}

.close-sidebar-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-sub);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    border-radius: 8px;
    transition: all 0.2s ease;
    width: 32px;
    height: 32px;
}

.close-sidebar-btn:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger);
    transform: scale(1.05);
}

.close-sidebar-btn:active {
    transform: scale(0.95);
}

/* Collapse Button */
.collapse-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-sub);
    cursor: pointer;
    padding: 0.5rem;
    display: none;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    border-radius: 8px;
    transition: all 0.2s ease;
    width: 32px;
    height: 32px;
}

.collapse-btn:hover {
    color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent);
    transform: scale(1.05);
}

.collapse-btn:active {
    transform: scale(0.95);
}

/* Sidebar (Mobile Drawer) */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.sidebar.open {
    transform: translateX(0);
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 90;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    flex-shrink: 0;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1.5rem;
    width: 100%;
    max-width: 100%;
}

/* --- Components --- */

/* Inputs */
.section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-sub);
    font-weight: 700;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.input-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

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

input,
select {
    width: 100%;
    padding: 0.75rem;
    padding-left: 1rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
    background: var(--bg);
    color: var(--text-main);
    appearance: none;
}

input:hover,
select:hover {
    border-color: var(--text-sub);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.prefix {
    position: absolute;
    left: 1rem;
    color: var(--text-sub);
    font-weight: 500;
    pointer-events: none;
}

.suffix {
    position: absolute;
    right: 1rem;
    color: var(--text-sub);
    font-weight: 500;
    pointer-events: none;
}

input.has-prefix {
    padding-left: 2rem;
}

input.has-suffix {
    padding-right: 3.5rem;
}

/* Toggle Switch */
.toggle-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding: 0.5rem 0;
}

.toggle-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-main);
}

.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border);
    transition: .3s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

input:checked+.slider {
    background-color: var(--accent);
}

input:checked+.slider:before {
    transform: translateX(18px);
}

/* Accordion */
.accordion {
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.accordion-header {
    width: 100%;
    padding: 1rem;
    background: var(--surface-hover);
    border: none;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion-content {
    padding: 1rem;
    display: none;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

.accordion.active .accordion-content {
    display: block;
}

.accordion.active .accordion-header svg {
    transform: rotate(180deg);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--surface);
    border-top: 1px solid var(--border);
    z-index: 10;
}

.btn {
    flex: 1;
    padding: 0.75rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--text-main);
    color: var(--bg);
    border: none;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
}

.btn-outline:hover {
    border-color: var(--text-sub);
    background: var(--surface-hover);
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    border-radius: 8px;
}

/* Header & Summary */
.header {
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-sub);
    font-size: 0.9rem;
}

.top-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.theme-toggle {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--surface-hover);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

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

.card-label {
    font-size: 0.85rem;
    color: var(--text-sub);
    margin-bottom: 0.5rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-value {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.03em;
}

.card-sub {
    font-size: 0.85rem;
    color: var(--success);
    margin-top: 0.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.card.highlight {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border: none;
    color: white;
}

.card.highlight .card-label {
    color: rgba(255, 255, 255, 0.8);
}

.card.highlight .card-value {
    color: white;
}

.card.highlight .card-sub {
    color: rgba(255, 255, 255, 0.9);
}

/* Charts */
.charts-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.5rem;
    height: 350px;
    position: relative;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.chart-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
}

.chart-canvas-wrapper {
    flex: 1;
    position: relative;
    min-height: 0;
}

.chart-canvas-wrapper canvas {
    cursor: crosshair;
    width: 100%;
    height: 100%;
    display: block;
}

.chart-legend {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-main);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 4px;
}

.legend-dashed {
    background: repeating-linear-gradient(90deg,
            var(--text-sub) 0px,
            var(--text-sub) 4px,
            transparent 4px,
            transparent 8px);
}

.legend-value {
    font-weight: 600;
}

/* Tooltip */
.chart-tooltip {
    position: absolute;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 0.85rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    box-shadow: var(--shadow-md);
    z-index: 100;
    min-width: 150px;
}

.chart-tooltip.show {
    opacity: 1;
}

.tooltip-title {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.tooltip-row {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 0.35rem;
    color: var(--text-sub);
}

.tooltip-label {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.tooltip-value {
    font-weight: 600;
    color: var(--text-main);
}

/* Market Rates */
.market-rates {
    margin-top: 2rem;
    margin-bottom: 2rem;
}

.market-rates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}

.rate-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.2s;
    text-decoration: none;
    color: var(--text-main);
    position: relative;
    overflow: hidden;
}

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

.bank-logo {
    height: 32px;
    width: auto;
    margin-bottom: 0.75rem;
    object-fit: contain;
}

.bank-logo-fallback {
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--accent);
}

.rate-display {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1;
    margin-bottom: 0.25rem;
}

.rate-disclaimer {
    font-size: 0.7rem;
    color: var(--text-sub);
}

.rate-badge {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: var(--success-bg);
    color: var(--success);
    font-size: 0.6rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 20px;
    text-transform: uppercase;
}

/* Table */
.table-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.table-wrapper {
    text-align: left;
    padding: 0.75rem;
    background: var(--surface-hover);
    color: var(--text-sub);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
    white-space: nowrap;
}

td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-main);
    white-space: nowrap;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: var(--surface-hover);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    backdrop-filter: blur(4px);
    padding: 1rem;
}

.modal-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: var(--surface);
    padding: 2rem;
    border-radius: 24px;
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: transform 0.2s;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-overlay.show .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-modal-btn {
    background: none;
    border: none;
    color: var(--text-sub);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: -0.5rem;
}

.close-modal-btn:hover {
    color: var(--text-main);
    background: var(--surface-hover);
    border-radius: 8px;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main);
}

.scenario-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 1.5rem;
}

.scenario-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.scenario-item:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
}

.scenario-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-main);
}

.scenario-info p {
    font-size: 0.8rem;
    color: var(--text-sub);
}

.delete-btn {
    color: var(--danger);
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    opacity: 0.7;
}

.delete-btn:hover {
    opacity: 1;
}

/* --- Desktop Breakpoint (1024px+) --- */
@media (min-width: 1024px) {
    body {
        padding: 2rem;
        display: flex;
        justify-content: center;
        align-items: flex-start;
    }

    .app-container {
        display: grid;
        grid-template-columns: 380px 1fr;
        gap: 0;
        max-width: 1600px;
        width: 100%;
        background: var(--surface);
        border-radius: 24px;
        box-shadow: var(--shadow-lg);
        overflow: hidden;
        height: calc(100dvh - 4rem);
        min-height: 0;
        transition: grid-template-columns 0.3s ease;
    }

    .app-container.sidebar-collapsed {
        grid-template-columns: 60px 1fr;
    }

    .mobile-header {
        display: none;
    }

    .sidebar-overlay {
        display: none;
    }

    .sidebar {
        position: relative;
        transform: none;
        width: auto;
        height: 100%;
        box-shadow: none;
        z-index: 1;
        border-right: 1px solid var(--border);
    }

    .sidebar-content {
        padding: 2rem;
        transition: padding 0.3s ease;
    }

    .close-sidebar-btn {
        display: none;
    }

    .collapse-btn {
        display: flex;
    }

    /* Collapsed sidebar styles */
    .app-container.sidebar-collapsed .sidebar-content {
        padding: 1.5rem 0.5rem;
        overflow-x: hidden;
    }

    .app-container.sidebar-collapsed .brand-text {
        display: none;
    }

    .app-container.sidebar-collapsed .sidebar-content>div:not(.brand) {
        display: none;
    }

    .app-container.sidebar-collapsed .action-buttons {
        display: none;
    }

    .app-container.sidebar-collapsed .brand {
        justify-content: center;
        margin-bottom: 2rem;
    }

    .app-container.sidebar-collapsed .collapse-btn {
        transform: rotate(180deg);
    }

    .main-content {
        padding: 3rem;
        overflow-y: auto;
        height: 100%;
    }

    .charts-section {
        grid-template-columns: 2fr 1fr;
    }

    .chart-container {
        height: 420px;
    }

    h1 {
        font-size: 2rem;
    }
}

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

    .app-container {
        display: block;
        box-shadow: none;
        border: none;
        max-width: none;
        height: auto;
        overflow: visible;
    }

    .mobile-header,
    .sidebar,
    .top-controls,
    .action-buttons,
    .accordion {
        display: none;
    }

    .main-content {
        padding: 0;
        height: auto;
        overflow: visible;
    }

    .card,
    .chart-container,
    .table-container {
        break-inside: avoid;
        border: 1px solid #ccc;
        box-shadow: none;
    }

    .charts-section {
        grid-template-columns: 1fr;
    }
}