:root,
[data-theme="light"] {
    --color-primary: #4A4A4A;
    --color-accent: #D4A017;
    --color-bg: #F9FAFB;
    --color-surface: #FFFFFF;
    --color-text: #111827;
    --color-text-secondary: #6B7280;
    --color-border: #E5E7EB;
    --color-success: #059669;
    --color-error: #DC2626;
    --color-warning: #D97706;
    --color-info: #2563EB;
    --color-sidebar-bg: #FFFFFF;
    --color-sidebar-hover: #F3F4F6;
    --color-sidebar-active: rgba(212, 160, 23, 0.1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --color-primary: #E5E5E5;
    --color-accent: #F0C040;
    --color-bg: #111827;
    --color-surface: #1F2937;
    --color-text: #F9FAFB;
    --color-text-secondary: #9CA3AF;
    --color-border: #374151;
    --color-success: #34D399;
    --color-error: #F87171;
    --color-warning: #FBBF24;
    --color-info: #60A5FA;
    --color-sidebar-bg: #1F2937;
    --color-sidebar-hover: #374151;
    --color-sidebar-active: rgba(240, 192, 64, 0.15);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
}

body {
    font-family: 'Source Sans 3', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: background-color 200ms ease, color 200ms ease;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Lexend', sans-serif;
}

.font-mono {
    font-family: 'JetBrains Mono', monospace;
    font-variant-numeric: tabular-nums;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #FFFFFF;
    padding: 0.625rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: opacity 200ms ease;
    cursor: pointer;
}
.btn-primary:hover { opacity: 0.9; }
.btn-primary:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn-secondary {
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    padding: 0.625rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    background: transparent;
    transition: background-color 200ms ease;
    cursor: pointer;
}
.btn-secondary:hover { background-color: var(--color-sidebar-hover); }

.card {
    background-color: var(--color-surface);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

input:not([type="checkbox"]):not([type="radio"]),
select,
textarea {
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    font-size: 1rem;
    background-color: var(--color-surface);
    color: var(--color-text);
    transition: border-color 200ms ease;
    width: 100%;
}
input:focus, select:focus, textarea:focus {
    border-color: var(--color-accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.2);
}