/* Base Theme Variables */
:root {
    /* Colors */
    --color-primary: #2C3E50;
    --color-secondary: #B4833E;
    --color-tertiary: #8E959C;
    --color-background-light: #F2F1EE;
    --color-background-dark: #1A1D21;
    
    /* Text Colors */
    --text-primary: #4A4A4A;
    --text-secondary: #666666;
    --text-tertiary: #8E959C;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Typography */
    --font-serif: 'Baskerville', serif;
    --font-sans: system-ui, -apple-system, sans-serif;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --color-primary: #8DA9C4;
    --text-primary: #E5E5E5;
    --text-secondary: #B8B8B8;
    --background: var(--color-background-dark);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--color-background-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    color: var(--color-primary);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

/* Links */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
}

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

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

.btn-secondary {
    background-color: var(--color-secondary);
    color: white;
}

.btn-outline {
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    background: transparent;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-tertiary);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* Cards */
.card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

/* Essay Styles */
.essay-content {
    max-width: 65ch;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
}

.essay-content p {
    margin-bottom: var(--spacing-lg);
}

/* Comments */
.comment {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-tertiary);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

/* Marks */
.mark-button {
    padding: var(--spacing-sm);
    border: 1px solid var(--color-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.mark-button.active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Utility Classes */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-tertiary { color: var(--color-tertiary); }

.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-tertiary { background-color: var(--color-tertiary); }

.font-serif { font-family: var(--font-serif); }
.font-sans { font-family: var(--font-sans); }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn var(--transition-normal);
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .essay-content {
        font-size: 1rem;
    }
}

/* Print Styles */
@media print {
    .no-print {
        display: none;
    }
    
    body {
        background: white;
    }
    
    .essay-content {
        max-width: none;
        font-size: 12pt;
    }
}