:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-muted: #94a3b8;

    --border-color: #e2e8f0;
    --border-light: #e6eef8;

    --accent-primary: #0b6e4f;
    --accent-hover: #0a5d42;
    --accent-light: rgba(11, 110, 79, 0.1);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 6px 18px rgba(15, 23, 42, 0.04);

    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --input-focus: #0b6e4f;

    --header-bg: rgba(255, 255, 255, 0.95);
    --header-text: #0f172a;

    --footer-bg: rgba(255, 255, 255, 0.95);
    --footer-text: #0f172a;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;

    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-muted: #64748b;

    --border-color: #334155;
    --border-light: #475569;

    --accent-primary: #10b981;
    --accent-hover: #059669;
    --accent-light: rgba(16, 185, 129, 0.15);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 6px 18px rgba(0, 0, 0, 0.5);

    --input-bg: #1e293b;
    --input-border: #475569;
    --input-focus: #10b981;

    --header-bg: rgba(15, 23, 42, 0.95);
    --header-text: #f1f5f9;

    --footer-bg: rgba(15, 23, 42, 0.95);
    --footer-text: #f1f5f9;
}

body {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.dark-mode-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    margin-right: 12px;
}

.dark-mode-toggle:hover {
    background: var(--accent-light);
    border-color: var(--accent-primary);
    transform: scale(1.05);
}

.dark-mode-toggle .icon-sun,
.dark-mode-toggle .icon-moon {
    font-size: 20px;
    transition: all 0.3s ease;
    position: absolute;
    filter: grayscale(1);
}

.dark-mode-toggle .icon-sun::before {
    content: "☀";
    color: var(--text-primary);
}

.dark-mode-toggle .icon-moon::before {
    content: "🌙";
    color: var(--text-primary);
}

.dark-mode-toggle .icon-sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.dark-mode-toggle .icon-moon {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

[data-theme="dark"] .dark-mode-toggle .icon-sun {
    opacity: 0;
    transform: rotate(-180deg) scale(0);
}

[data-theme="dark"] .dark-mode-toggle .icon-moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.topbar {
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
}

.topbar .brand-name,
.topbar .mainnav a {
    color: var(--header-text);
}

.topbar .mainnav a:hover {
    color: var(--accent-primary);
}

.card {
    background: var(--bg-card);
    border-color: var(--border-light);
    box-shadow: var(--shadow-lg);
}

input,
textarea,
select {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--text-primary);
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--input-focus);
    background-color: var(--input-bg);
}

.btn-edit-mode {
    background: var(--accent-primary);
    color: white;
}

.btn-edit-mode:hover {
    background: var(--accent-hover);
}

footer,
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
}

footer a,
.footer a {
    color: var(--footer-text);
}

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

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

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

.small-note {
    color: var(--text-secondary);
}

.chart-option {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.chart-option:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.add-chart-panel {
    background: var(--bg-card);
    border-color: var(--border-color);
}

.add-chart-panel h3 {
    color: var(--text-primary);
}

[data-theme="dark"] canvas {
    background: transparent;
}

@media (max-width: 768px) {
    .dark-mode-toggle {
        order: -1;
        margin-right: 8px;
    }

    
    [data-theme="dark"] .page-title {
        color: #ffffff;
        font-weight: 700;
        text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
    }

    [data-theme="dark"] .card-title {
        color: #f1f5f9;
        font-weight: 600;
    }

    [data-theme="dark"] .large-value {
        color: #ffffff;
        font-weight: 700;
    }

    [data-theme="dark"] .small-note {
        color: #cbd5e1;
    }
}

@media (max-width: 1100px) {
    [data-theme="dark"] .page-title {
        color: #ffffff;
        font-weight: 700;
        text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
    }

    [data-theme="dark"] .card-title {
        color: #f1f5f9;
        font-weight: 600;
    }

    [data-theme="dark"] .large-value {
        color: #ffffff;
    }
}

[data-theme="dark"] .patients-list-overlay .patients-list-content {
    background: var(--bg-card);
    color: var(--text-primary);
}

[data-theme="dark"] .empty-state-content {
    background: var(--bg-card, #1e293b);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .empty-state-icon {
    color: var(--text-muted, #64748b);
}

[data-theme="dark"] .empty-state-title {
    color: var(--text-primary, #f1f5f9);
}

[data-theme="dark"] .empty-state-description {
    color: var(--text-secondary, #94a3b8);
}

[data-theme="dark"] .thresholds-legend {
    background: var(--card-bg-dark, #1d2833);
}

[data-theme="dark"] .thresholds-legend h2 {
    color: var(--text-primary-dark, #f9fafb);
}

[data-theme="dark"] .legend-intro,
[data-theme="dark"] .legend-text span,
[data-theme="dark"] .legend-note {
    color: var(--text-secondary-dark, #d1d5db);
}

[data-theme="dark"] .legend-item {
    background: var(--bg-secondary-dark, #374151);
}

[data-theme="dark"] .legend-item:hover {
    background: var(--bg-hover-dark, #4b5563);
}

[data-theme="dark"] .legend-text strong,
[data-theme="dark"] .legend-note strong {
    color: var(--text-primary-dark, #f9fafb);
}

[data-theme="dark"] .legend-note {
    background: var(--bg-info-dark, #1e3a5f);
    border-left-color: var(--color-info-dark, #60a5fa);
}