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

:root {
    --bg-primary: #fafafa;
    --bg-secondary: #f0f0f0;
    --bg-sidebar: #3a3a3a;
    --bg-sidebar-hover: #4a4a4a;
    --text-primary: #2a2a2a;
    --text-secondary: #6a6a6a;
    --text-light: #e8e8e8;
    --border-color: #d0d0d0;
    --input-bg: #fafafa;
    --input-border: #d0d0d0;
    --result-bg: #f5f5f5;
    --result-text: #4a4a4a;
    --positive: #5a5a5a;
    --negative: #8a8a8a;
    --warning-bg: #fff8e1;
    --warning-border: #ffb74d;
    --table-header-bg: #f5f5f5;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #242424;
    --bg-sidebar: #151515;
    --bg-sidebar-hover: #2a2a2a;
    --text-primary: #d8d8d8;
    --text-secondary: #a0a0a0;
    --text-light: #d8d8d8;
    --border-color: #3a3a3a;
    --input-bg: #242424;
    --input-border: #3a3a3a;
    --result-bg: #242424;
    --result-text: #a8a8a8;
    --positive: #b0b0b0;
    --negative: #909090;
    --warning-bg: #3a3420;
    --warning-border: #b8860b;
    --table-header-bg: #242424;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: background 0.3s, color 0.3s;
}

a {
    color: var(--text-primary);
    text-decoration: underline;
}

a:hover {
    color: var(--text-secondary);
}

a:visited {
    color: var(--text-primary);
}

.disclaimer {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    padding: 10px;
    text-align: center;
    font-size: 12px;
    color: var(--text-primary);
}

.container {
    display: flex;
    min-height: calc(100vh - 100px);
}

#sidebar {
    width: 200px;
    background: var(--bg-sidebar);
    color: var(--text-light);
    padding: 20px;
    flex-shrink: 0;
}

.sidebar-header {
    margin-bottom: 20px;
    border-bottom: 2px solid var(--bg-sidebar-hover);
    padding-bottom: 10px;
}

#sidebar h2 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-light);
}

#nav-title {
    color: var(--text-light);
}

.theme-controls {
    display: flex;
    gap: 5px;
    margin-top: 5px;
}

#lang-toggle,
#theme-toggle {
    flex: 1;
    padding: 5px 10px;
    font-size: 12px;
    cursor: pointer;
    border-radius: 4px;
    border: 1px solid var(--text-light);
    background: var(--text-light);
    color: var(--bg-sidebar);
    transition: background 0.3s, border-color 0.3s;
}

#lang-toggle:hover,
#theme-toggle:hover {
    background: #bdc3c7;
    border-color: #bdc3c7;
}

#currency-selector {
    width: 100%;
    margin-top: 5px;
    padding: 5px;
    border-radius: 4px;
    background: var(--text-light);
    color: var(--bg-sidebar);
    border: 1px solid var(--text-light);
    cursor: pointer;
}

#nav-menu {
    list-style: none;
}

#nav-menu li {
    margin-bottom: 10px;
}

#nav-menu a {
    color: var(--text-light);
    text-decoration: none;
    display: block;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background 0.3s;
}

#nav-menu a:hover,
#nav-menu a.active {
    background: var(--bg-sidebar-hover);
}

#main-content {
    flex: 1;
    padding: 30px;
    background: var(--bg-primary);
}

.actions {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.btn {
    padding: 10px 20px;
    margin-right: 10px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 4px;
    font-size: 14px;
    transition: background 0.3s, border-color 0.3s;
}

.btn:hover {
    background: var(--bg-secondary);
}

.btn-primary {
    background: #3498db;
    color: #fff;
    border-color: #3498db;
}

.btn-primary:hover {
    background: #2980b9;
    border-color: #2980b9;
}

.btn-danger {
    background: #e74c3c;
    color: #fff;
    border-color: #e74c3c;
}

.btn-danger:hover {
    background: #c0392b;
    border-color: #c0392b;
}

.btn-small {
    padding: 5px 10px;
    font-size: 12px;
}

h1 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

h2 {
    font-size: 18px;
    margin: 20px 0 10px 0;
    color: var(--text-primary);
}

h3 {
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: flex;
    align-items: center;
    margin-bottom: 5px;
    font-weight: 500;
    gap: 5px;
}

.info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-secondary);
    color: var(--bg-primary);
    font-size: 12px;
    font-weight: bold;
    cursor: help;
    position: relative;
}

.info-icon:hover .tooltip {
    display: block;
}

.tooltip {
    display: none;
    position: absolute;
    left: 25px;
    top: -5px;
    background: var(--bg-sidebar);
    color: var(--text-light);
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: normal;
    white-space: nowrap;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

input[type="text"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    font-size: 14px;
    background: var(--input-bg);
    color: var(--text-primary);
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #3498db;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th,
td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

th {
    background: var(--table-header-bg);
    font-weight: 600;
}

input[type="text"].table-input,
input[type="number"].table-input {
    width: 100%;
    padding: 5px;
    border: 1px solid var(--input-border);
    border-radius: 3px;
    background: var(--input-bg);
    color: var(--text-primary);
}

.result {
    background: var(--result-bg);
    padding: 15px;
    border-radius: 4px;
    margin: 20px 0;
}

.result canvas {
    max-height: 500px;
    width: 100% !important;
    height: auto !important;
}

.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 10px 0;
}

.result h3 {
    margin-bottom: 10px;
    color: var(--result-text);
}

.result-row {
    display: flex;
    justify-content: space-between;
    padding: 5px 0;
}

.positive {
    color: var(--positive);
}

.negative {
    color: var(--negative);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.comparison-results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 20px 0;
}

footer {
    margin-top: 20px;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    #sidebar {
        width: 100%;
        padding: 15px;
    }

    #nav-menu {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }

    #nav-menu li {
        margin: 0;
    }

    #main-content {
        padding: 20px;
    }

    .grid-3,
    .grid-2,
    .comparison-results {
        grid-template-columns: 1fr;
    }

    .result canvas {
        max-height: 300px;
    }

    table {
        font-size: 12px;
    }

    table th,
    table td {
        padding: 8px 6px;
        min-width: 80px;
    }

    .table-input {
        min-width: 70px;
        font-size: 12px;
        padding: 4px;
    }

    .actions {
        display: flex;
        flex-wrap: wrap;
    }
}

input.validation-error,
select.validation-error {
    border-color: #d32f2f;
    background-color: #ffebee;
}

[data-theme="dark"] input.validation-error,
[data-theme="dark"] select.validation-error {
    border-color: #f44336;
    background-color: #3a1a1a;
}

.validation-error-message {
    color: #d32f2f;
    font-size: 12px;
    margin-top: 4px;
    display: none;
}

[data-theme="dark"] .validation-error-message {
    color: #f44336;
}

@media print {
    .disclaimer,
    #sidebar,
    .actions,
    footer {
        display: none;
    }

    #main-content {
        padding: 0;
    }

    body {
        font-size: 12px;
    }
}