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

:root {
    /* Color Palette - Modern Deep Blues */
    --primary-color: #1A3A6C;
    --primary-dark: #0D2147;
    --primary-light: #2C5282;
    --accent-color: #2B89E0;
    --success-color: #27AE60;
    --warning-color: #F39C12;
    --error-color: #E74C3C;

    /* CEFR Level Colors */
    --a1-color: #E74C3C;
    --a2-color: #E67E22;
    --b1-color: #F39C12;
    --b2-color: #27AE60;
    --c1-color: #3498DB;
    --c2-color: #9B59B6;

    /* Neutral Colors */
    --bg-color: #F8FAFC;
    --card-bg: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --border-color: #E2E8F0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* Base Styles */
body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Header */
.header {
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.logo h1 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
}

.github-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-base);
}

.github-link a:hover {
    text-decoration: underline;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-color);
}

/* Section Headers */
h2, h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.section-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-base);
}

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.text-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    resize: vertical;
    min-height: 200px;
    transition: border-color 0.2s ease;
}

.text-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(43, 137, 224, 0.1);
}

.input-hint {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Buttons */
.button-group {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all 0.2s ease;
    position: relative;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-light) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(43, 137, 224, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: #F1F5F9;
    border-color: #CBD5E1;
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary-light);
    color: var(--primary-light);
}

.btn-outline:hover {
    background: rgba(44, 82, 130, 0.05);
}

/* Button Loader */
.btn-loader {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.8s linear infinite;
}

.btn-loader.active {
    display: block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Compact Stats */
.compact-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin: var(--spacing-md) 0;
    padding: 0 var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.stat-item {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
}

.stat-value {
    font-weight: 600;
    color: var(--text-primary);
}

.stat-name {
    font-weight: 400;
}

/* Distribution Bars */
.distribution-container h3 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.distribution-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.distribution-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.distribution-label {
    width: 40px;
    font-weight: 500;
}

.distribution-track {
    flex: 1;
    height: 20px;
    background: var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
}

.distribution-fill {
    height: 100%;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--spacing-sm);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: width 0.5s ease;
}

.distribution-count {
    width: 30px;
    text-align: right;
    color: var(--text-secondary);
}

/* Annotated Text */
.container-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.main-result {
    padding: var(--spacing-xl);
}

.annotated-text {
    line-height: 2.5; /* Generous line height for the underlines */
    font-size: var(--font-size-lg);
    font-family: var(--font-family);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.annotation {
    display: inline;
    padding-bottom: 2px;
    border-bottom-width: 3px;
    border-bottom-style: solid;
    background-color: transparent; /* Override any potential background utilities */
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    cursor: help;
}

.annotation:hover {
    background-color: rgba(0, 0, 0, 0.03); /* Very subtle hover effect */
}

/* Specific border colors for annotations - Overriding the general background utility classes */
.annotated-text .annotation.level-a1 { border-bottom-color: var(--a1-color); background-color: transparent; }
.annotated-text .annotation.level-a2 { border-bottom-color: var(--a2-color); background-color: transparent; }
.annotated-text .annotation.level-b1 { border-bottom-color: var(--b1-color); background-color: transparent; }
.annotated-text .annotation.level-b2 { border-bottom-color: var(--b2-color); background-color: transparent; }
.annotated-text .annotation.level-c1 { border-bottom-color: var(--c1-color); background-color: transparent; }
.annotated-text .annotation.level-c2 { border-bottom-color: var(--c2-color); background-color: transparent; }

/* In case the utility classes win specificity wise, we ensure these apply */
.annotation.level-a1, .annotation.level-a2, .annotation.level-b1, 
.annotation.level-b2, .annotation.level-c1, .annotation.level-c2 {
    background-color: transparent;
}

.annotation:hover.level-a1 { background-color: rgba(231, 76, 60, 0.1); }
.annotation:hover.level-a2 { background-color: rgba(230, 126, 34, 0.1); }
.annotation:hover.level-b1 { background-color: rgba(243, 156, 18, 0.1); }
.annotation:hover.level-b2 { background-color: rgba(39, 174, 96, 0.1); }
.annotation:hover.level-c1 { background-color: rgba(52, 152, 219, 0.1); }
.annotation:hover.level-c2 { background-color: rgba(155, 89, 182, 0.1); }

.annotation-hidden {
    border-bottom-color: transparent !important;
}

.cefr-badge {
    /* Deprecated but kept to prevent errors if stale JS runs */
    display: none;
}

/* Sentence Table */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.sentence-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-base);
}

.sentence-table th {
    background: #F1F5F9;
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.sentence-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.sentence-table tbody tr:last-child td {
    border-bottom: none;
}

.sentence-table tbody tr:nth-child(even) {
    background: #F8FAFC;
}

.sentence-table tbody tr:hover {
    background: #E2E8F0;
}

.sentence-text {
    max-width: 600px;
    word-wrap: break-word;
}

.level-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.level-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.confidence-bar {
    display: inline-block;
    width: 60px;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    position: relative;
    margin-left: var(--spacing-sm);
}

.confidence-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: var(--accent-color);
    border-radius: 3px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-content {
    background: white;
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-header {
    padding: var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.2s ease;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.modal-body {
    padding: var(--spacing-lg);
    color: var(--text-primary);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xl);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm);
    }

    .header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
        padding: var(--spacing-lg);
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .container-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }

    .sentence-table {
        font-size: var(--font-size-sm);
    }

    .sentence-table th,
    .sentence-table td {
        padding: var(--spacing-sm);
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeIn 0.4s ease forwards;
}

/* CEFR Level Colors */
.level-a1 { background-color: var(--a1-color); }
.level-a2 { background-color: var(--a2-color); }
.level-b1 { background-color: var(--b1-color); }
.level-b2 { background-color: var(--b2-color); }
.level-c1 { background-color: var(--c1-color); }
.level-c2 { background-color: var(--c2-color); }

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }