:root {
    /* Color Palette - Premium Modern */
    --primary-color: #2e7d32;
    --primary-light: #4caf50;
    --primary-dark: #1b5e20;
    
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --surface-hover: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --border-color: #e2e8f0;
    --border-highlight: #cbd5e1;
    
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --danger-bg: #fef2f2;
    
    --success: #10b981;
    --success-bg: #d1fae5;
    
    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    
    /* Shadows & Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    
    /* Layout */
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --border-color: #334155;
    --border-highlight: #475569;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    
    --danger-bg: rgba(239, 68, 68, 0.1);
    --success-bg: rgba(16, 185, 129, 0.1);
    --warning-bg: rgba(245, 158, 11, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color var(--transition-base), color var(--transition-base);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-sm { font-size: 0.875rem; }
.w-100 { width: 100%; }

/* App Loader */
.app-loader {
    position: fixed;
    inset: 0;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { 100% { transform: rotate(360deg); } }

/* Navbar */
.navbar {
    background-color: var(--surface-color);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.brand-icon {
    font-size: 1.5rem;
}

.nav-actions {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-btn:hover {
    background-color: var(--surface-hover);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Update Target btn width to auto so text fits */
#target-cgpa-btn {
    width: auto;
    padding: 0 1rem;
    gap: 0.5rem;
}

/* Main Container */
.main-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
    flex-grow: 1;
    width: 100%;
}

/* Dashboard Panel */
.dashboard-panel {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.dashboard-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.preset-dropdown {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--surface-color);
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    cursor: pointer;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--surface-hover);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.primary-stat {
    background: linear-gradient(135deg, rgba(46, 125, 50, 0.1) 0%, rgba(76, 175, 80, 0.05) 100%);
    border: 1px solid rgba(46, 125, 50, 0.2);
}

.stat-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    background: var(--surface-color);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 2.25rem;
    font-weight: 700;
    line-height: 1.1;
}

/* Badges */
.stat-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-neutral { background: var(--surface-color); color: var(--text-muted); border: 1px solid var(--border-color); }

/* Dashboard Actions */
.dashboard-actions {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.action-group {
    display: flex;
    gap: 0.5rem;
}

/* Buttons */
.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    font-family: inherit;
    font-size: 0.95rem;
}

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

.outline-btn {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-secondary);
}
.outline-btn:hover {
    background-color: var(--surface-hover);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.danger-btn {
    background-color: transparent;
    border-color: var(--danger);
    color: var(--danger);
}
.danger-btn:hover {
    background-color: var(--danger);
    color: white;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    width: 30px;
    height: 30px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: var(--surface-hover);
    color: var(--danger);
}

/* Semesters Grid/Container */
.semesters-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

/* Semester Card */
.semester-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    animation: slideUp 0.3s ease-out;
}

.semester-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--border-highlight);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.semester-header {
    background: var(--surface-hover);
    padding: 1rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.semester-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.editable-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    outline: none;
    cursor: text;
    padding: 0.2rem;
    border-radius: 4px;
    position: relative;
    min-width: 100px;
}
.editable-title:empty::before {
    content: attr(data-placeholder);
    color: var(--text-muted);
}
.editable-title:focus {
    background: var(--surface-color);
    border: 1px solid var(--primary-light);
}
.edit-icon { font-size: 0.8rem; opacity: 0.5; }

/* Courses List */
.courses-list {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    flex-grow: 1;
}

.course-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.98); }
    to { opacity: 1; transform: scale(1); }
}

.flex-2 { flex: 2; }
.flex-1 { flex: 1; }

.course-input-group input, 
.course-input-group select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--surface-color);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.course-input-group input:focus, 
.course-input-group select:focus {
    border-color: var(--primary-color);
}

.semester-controls {
    padding: 0 1rem 1rem 1rem;
}

.add-course-btn {
    width: 100%;
    background: transparent;
    border: 1px dashed var(--border-highlight);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.add-course-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--surface-hover);
}

.semester-footer {
    display: flex;
    border-top: 1px solid var(--border-color);
    background: var(--surface-hover);
}

.semester-stat {
    flex: 1;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
}

.semester-stat span {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.semester-stat strong {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.semester-stat.highlight {
    background: rgba(46, 125, 50, 0.05);
    border-left: 1px solid var(--border-color);
}
.semester-stat.highlight strong {
    color: var(--primary-color);
}

/* Modals */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    transform: scale(1);
    transition: transform 0.3s ease;
    border: 1px solid var(--border-color);
}

.modal-overlay.hidden .modal {
    transform: scale(0.95);
}

.modal-sm { max-width: 400px; }

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 { font-size: 1.25rem; font-weight: 600; color: var(--primary-color); }

.close-btn {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    color: var(--text-muted);
    cursor: pointer;
}
.close-btn:hover { color: var(--danger); }

.modal-body {
    padding: 1.5rem;
}

.modal-desc {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--surface-color);
    color: var(--text-primary);
}
.input-group input:focus { border-color: var(--primary-color); outline: none; }

.btn-block {
    width: 100%;
    padding: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 1rem;
}
.primary-btn { background: var(--primary-color); color: white; }
.primary-btn:hover { background: var(--primary-dark); }

.target-result-box {
    margin-top: 1.5rem;
    background: var(--surface-hover);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border-color);
}
.target-result-box span { color: var(--text-secondary); font-size: 0.9rem; }
.target-result-box h3 { font-size: 2.5rem; color: var(--primary-color); margin: 0.5rem 0; }

/* Share buttons */
.share-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    margin-top: 1rem;
}
.share-btn {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    color: white;
}
.share-btn.whatsapp { background: #25D366; }
.share-btn.email { background: #ea4335; }

.copy-link {
    display: flex;
    gap: 0.5rem;
}
.copy-link input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--surface-hover);
    color: var(--text-secondary);
}
.btn-sm {
    padding: 0 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-primary);
    cursor: pointer;
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 2rem 1rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--surface-color);
    margin-top: auto;
}
.site-footer strong { color: var(--primary-color); }

/* SEO Article Section */
.seo-content-container {
    padding: 3rem 1.5rem;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    margin-top: 1rem;
}

.seo-article {
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-primary);
}

.seo-article h2, .seo-article h3 {
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.seo-article h2 {
    font-size: 2rem;
    text-align: center;
}

.seo-article p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.steps-list {
    margin-left: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.steps-list li {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.steps-list strong {
    color: var(--text-primary);
}

.table-responsive {
    overflow-x: auto;
    margin-bottom: 2.5rem;
}

.grading-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface-hover);
    border-radius: var(--radius-md);
    overflow: hidden;
    text-align: left;
}

.grading-table th, .grading-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.grading-table th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.grading-table tr:hover td {
    background: rgba(46, 125, 50, 0.05); /* very light green highlight */
}

.faq-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.faq-item h4 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.faq-item p {
    margin-bottom: 0;
}

/* E-E-A-T Formatting */
.article-header {
    text-align: center;
    margin-bottom: 2rem;
}

.article-header h2 {
    margin-bottom: 0.5rem;
}

.eeat-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--surface-hover);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    font-weight: 500;
}

.eeat-badge i {
    color: var(--primary-color);
}

.trust-box {
    background: linear-gradient(to right, rgba(46, 125, 50, 0.05), transparent);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin-bottom: 2rem;
}

.trust-box h3 {
    margin-top: 0 !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem !important;
}

.trust-box ul {
    margin-left: 1.5rem;
    color: var(--text-secondary);
}

.trust-box li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.trust-box li strong {
    color: var(--text-primary);
}

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

/* Department Grid */
.dept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.dept-card {
    background: var(--surface-hover);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.dept-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-highlight);
}

.dept-card h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.dept-card p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Table of Contents */
.table-of-contents {
    background: var(--surface-hover);
    border-left: 4px solid var(--primary-light);
    padding: 1.5rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin-bottom: 2rem;
}

.table-of-contents h3 {
    margin-top: 0 !important;
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.table-of-contents ul {
    list-style-type: none;
    margin-left: 0;
}

.table-of-contents li {
    margin-bottom: 0.5rem;
}

.table-of-contents a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.table-of-contents a:hover {
    text-decoration: underline;
}

/* Reviews / Social Proof */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.review-card {
    background: var(--surface-hover);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.review-stars {
    color: var(--warning);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.review-card p {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.reviewer-name {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Author Box */
.author-box {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.author-info h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.author-info p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* Print Styles */
@media print {
    body { background: white !important; color: black !important; }
    .print-hide { display: none !important; }
    .dashboard-panel { box-shadow: none; border: 1px solid #ccc; }
    .semester-card { box-shadow: none; border: 1px solid #ccc; page-break-inside: avoid; }
    .courses-list select { appearance: none; border: none; background: transparent; }
    .courses-list input { border: none; background: transparent; }
    .semesters-container { grid-template-columns: 1fr 1fr; }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .hide-mobile { display: none; }
    .form-grid { grid-template-columns: 1fr; }
    .dashboard-actions { flex-direction: column; }
    .action-group { width: 100%; display: grid; grid-template-columns: 1fr 1fr 1fr; }
    .add-semester-btn { width: 100%; justify-content: center; }
}