:root {
    --bg-color: #f4f4f4;
    --card-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #555555;
    --border-color: #dddddd;
    --accent-color: #0073aa;
    --accent-hover: #005a87;
    --result-bg: #f8f9fa;
    --result-border: #e9ecef;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #bbbbbb;
    --border-color: #444444;
    --accent-color: #3498db;
    --accent-hover: #2980b9;
    --result-bg: #363636;
    --result-border: #4a4a4a;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: var(--bg-color);
    margin: 0;
    padding: 20px;
    color: var(--text-primary);
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: relative;
}

h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 25px;
}

/* Top bar with theme toggle and auth */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-toggle select {
    padding: 6px 10px;
    font-size: 13px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    width: auto;
}

.theme-toggle {
    /* no longer absolutely positioned */
}

.auth-bar {
    display: flex;
    align-items: center;
    gap: 10px;
}

.auth-user {
    font-weight: bold;
    color: var(--accent-color);
    font-size: 14px;
}

.auth-link {
    font-size: 14px;
    color: var(--accent-color);
    text-decoration: none;
}

.auth-link:hover {
    text-decoration: underline;
}

/* Auth form page */
.auth-form {
    max-width: 400px;
    margin: 0 auto;
}

.auth-error {
    background: #f8d7da;
    color: #721c24;
    padding: 10px 15px;
    border-radius: 4px;
    margin-bottom: 15px;
    text-align: center;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.auth-toggle {
    text-align: center;
    margin-top: 15px;
    color: var(--text-secondary);
}

.auth-toggle a {
    color: var(--accent-color);
}

.auth-divider {
    display: flex;
    align-items: center;
    margin: 20px auto;
    max-width: 400px;
    color: #999;
    font-size: 0.85rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid #ddd;
}

.auth-divider span {
    padding: 0 12px;
}

.btn-google {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    max-width: 400px;
    margin: 0 auto;
    padding: 12px 20px;
    background: #fff;
    color: #333;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}

.btn-google:hover {
    background: #f8f8f8;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn-google svg {
    flex-shrink: 0;
}

#themeBtn {
    padding: 8px 12px;
    font-size: 14px;
    border-radius: 20px;
    background: var(--accent-color);
    color: white;
    cursor: pointer;
    border: none;
    width: auto;
}

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

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: var(--text-secondary);
}

input[type="text"], input[type="number"], select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 16px;
    background: var(--card-bg);
    color: var(--text-primary);
}

.form-row {
    display: flex;
    gap: 15px;
}

.half-width {
    flex: 1;
}

.input-group {
    display: flex;
}

.input-group input {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-right: none;
}

.input-group select {
    width: 80px;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    background-color: var(--result-bg);
    cursor: pointer;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.2s;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--accent-text, #ffffff);
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: var(--accent-text, #ffffff);
}

.btn-secondary {
    background: #e0e0e0;
    color: #333;
}

.btn-secondary:hover {
    background: #cccccc;
}

.dark-mode .btn-secondary {
    background: #374151;
    color: #f3f4f6;
}

.dark-mode .btn-secondary:hover {
    background: #4b5563;
}

.hidden {
    display: none !important;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 30px;
}

.result-card {
    background: var(--result-bg);
    border: 1px solid var(--result-border);
    padding: 15px;
    border-radius: 6px;
    text-align: center;
}

.full-width-card {
    grid-column: 1 / -1;
}

.result-card h4 {
    margin: 0 0 10px 0;
    color: var(--text-secondary);
    font-size: 14px;
    text-transform: uppercase;
}

.result-value {
    font-size: 24px;
    font-weight: bold;
    color: var(--accent-color);
}

.result-subtext {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* Gauge Styles */
.gauge-container {
    margin-top: 15px;
    padding: 0 10px;
}

.gauge-bar {
    height: 10px;
    background: linear-gradient(to right, #f39c12 0%, #27ae60 25%, #27ae60 50%, #e67e22 75%, #c0392b 100%);
    border-radius: 5px;
    position: relative;
}

.gauge-pointer {
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 10px solid var(--text-primary);
    position: absolute;
    top: -12px;
    left: 0%;
    transform: translateX(-50%);
    transition: left 0.5s ease-out;
}

.gauge-labels {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* Macro Styles */
.macros-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 10px;
}

.macro-item {
    background: var(--card-bg);
    padding: 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.macro-label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.macro-value {
    font-weight: bold;
    color: var(--accent-color);
    font-size: 18px;
}

.ideal-weight {
    margin-top: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

#idealWeightRange {
    font-weight: bold;
    color: #27ae60;
}

.status-underweight { color: #f39c12; }
.status-normal { color: #27ae60; }
.status-overweight { color: #e67e22; }
.status-obese { color: #c0392b; }

body.dark-mode .status-underweight { color: #f5b041; }
body.dark-mode .status-overweight { color: #eb984e; }

/* Focus styles for accessibility */
input:focus-visible,
select:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
    z-index: 100;
    padding: 10px 15px;
    background: var(--accent-color);
    color: #fff;
    font-weight: bold;
    text-decoration: none;
    border-radius: 0 0 4px 0;
}

.skip-link:focus {
    position: fixed;
    left: 0;
    top: 0;
    width: auto;
    height: auto;
    overflow: visible;
}

.divider {
    border: 0;
    height: 1px;
    background: var(--border-color);
    margin: 30px 0;
}

/* History */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    font-size: 14px;
    background: var(--card-bg);
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

th {
    background: var(--result-bg);
    font-weight: bold;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.user-filter select {
    width: auto;
}

.btn-export {
    padding: 8px 15px;
    background: #27ae60;
    color: white;
    border-radius: 4px;
    font-size: 13px;
    width: auto;
    margin-left: 10px;
}

/* Body Measurements */
.body-measurements {
    margin-bottom: 15px;
}

.body-measurements summary {
    font-weight: bold;
    color: var(--accent-color);
    cursor: pointer;
    padding: 10px;
    background: var(--result-bg);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.body-measurements .form-row {
    margin-top: 15px;
}

/* Converters */
.converter-wrapper {
    display: flex;
    gap: 20px;
    margin-top: 15px;
}

.converter-section {
    flex: 1;
    background: var(--card-bg);
    padding: 15px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.advanced-converter summary {
    font-weight: bold;
    color: var(--accent-color);
    cursor: pointer;
    padding: 10px;
    background: var(--result-bg);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.visitor-counter {
    margin-top: 30px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.chart-container {
    height: 320px;
    margin-bottom: 20px;
}

@media (max-width: 600px) {
    .form-row, .results-grid, .converter-wrapper, .macros-grid {
        flex-direction: column;
        grid-template-columns: 1fr;
    }
}