/* AITBC Documentation Styles
 * Shared CSS for all documentation pages
 */

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

/* ============================================
   Theme Variables
   ============================================ */

/* Dark mode (default) */
:root {
    --primary-color: #3b82f6;
    --secondary-color: #2563eb;
    --accent-color: #60a5fa;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-dark: #f3f4f6;
    --text-light: #9ca3af;
    --bg-light: #111827;
    --bg-white: #1f2937;
    --border-color: #374151;
    --code-bg: #0d1117;
    --code-text: #e6edf3;
}

/* Light mode */
body.light {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --code-bg: #1f2937;
    --code-text: #e5e7eb;
}

/* ============================================
   Base Styles
   ============================================ */

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ============================================
   Header & Navigation
   ============================================ */

header {
    background: var(--bg-white);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid transparent;
    background-image: linear-gradient(var(--bg-white), var(--bg-white)), 
                      linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--success-color));
    background-origin: border-box;
    background-clip: padding-box, border-box;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-dark);
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--text-dark);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: var(--bg-white);
    border-color: var(--primary-color);
    transform: scale(1.05);
}

/* ============================================
   Main Content
   ============================================ */

main {
    margin-top: 80px;
    padding: 40px 0;
}

.doc-header {
    text-align: center;
    margin-bottom: 3rem;
}

.doc-header h1 {
    font-size: 3rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.doc-header p {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Content Sections
   ============================================ */

.content-section {
    background: var(--bg-white);
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.content-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.content-section h3 {
    font-size: 1.4rem;
    margin: 1.5rem 0 1rem;
    color: var(--text-dark);
}

.content-section h4 {
    font-size: 1.1rem;
    margin: 1rem 0 0.5rem;
    color: var(--primary-color);
}

.content-section p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.content-section ul,
.content-section ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.content-section li {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

/* ============================================
   Code Blocks
   ============================================ */

.code-block {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%);
    color: #e6edf3;
    padding: 1.5rem;
    border-radius: 10px;
    overflow-x: auto;
    margin: 1rem 0;
    font-family: 'Fira Code', 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    border: 1px solid #30363d;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    white-space: pre-wrap;
    word-wrap: break-word;
}

code {
    background: var(--bg-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Fira Code', 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--accent-color);
}

/* ============================================
   Steps
   ============================================ */

.step {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.step:last-of-type {
    border-bottom: none;
}

.step-number {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1rem;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.step-content {
    flex-grow: 1;
}

.step-content h4 {
    color: var(--text-dark);
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.step-content p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

/* ============================================
   Alert Boxes
   ============================================ */

.alert {
    padding: 1rem 1.25rem;
    border-radius: 8px;
    margin: 1.5rem 0;
}

.alert-info {
    background: rgba(59, 130, 246, 0.15);
    border-left: 4px solid #3b82f6;
    color: var(--text-dark);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.15);
    border-left: 4px solid #f59e0b;
    color: var(--text-dark);
}

.alert-success {
    background: rgba(16, 185, 129, 0.15);
    border-left: 4px solid #10b981;
    color: var(--text-dark);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.15);
    border-left: 4px solid #ef4444;
    color: var(--text-dark);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-color);
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    color: #fff;
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: #fff;
}

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

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

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

/* ============================================
   Cards & Grids
   ============================================ */

.card {
    background: var(--bg-white);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ============================================
   Tables
   ============================================ */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--bg-light);
    color: var(--text-dark);
    font-weight: 600;
}

tr:hover {
    background: rgba(59, 130, 246, 0.05);
}

/* ============================================
   Badges
   ============================================ */

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-primary {
    background: var(--primary-color);
    color: #fff;
}

.badge-success {
    background: var(--success-color);
    color: #fff;
}

.badge-warning {
    background: var(--warning-color);
    color: #fff;
}

.badge-danger {
    background: var(--danger-color);
    color: #fff;
}

/* ============================================
   Quick Links
   ============================================ */

.quick-links {
    background: var(--bg-white);
    border-radius: 15px;
    padding: 3rem;
    margin-bottom: 4rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.quick-links h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
    text-align: center;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.link-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.3s;
}

.link-item:hover {
    background: var(--primary-color);
    color: #fff;
    transform: translateX(5px);
}

.link-item i {
    font-size: 1.5rem;
    margin-right: 1rem;
    color: var(--primary-color);
}

.link-item:hover i {
    color: #fff;
}

/* ============================================
   Footer
   ============================================ */

footer {
    background: var(--bg-white);
    color: var(--text-dark);
    padding: 40px 0;
    text-align: center;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-light);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .doc-header h1 {
        font-size: 2rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .step {
        flex-direction: column;
    }
    
    .content-section {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.hidden { display: none; }
.flex { display: flex; }
.flex-center { 
    display: flex; 
    align-items: center; 
    justify-content: center; 
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.animate-fadeIn {
    animation: fadeIn 0.5s ease-out;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* ============================================
   Page-Specific: Audience Badge
   ============================================ */

.audience-badge {
    display: inline-block;
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 1rem;
}

.audience-badge.miner {
    background: var(--primary-color);
}

.audience-badge.client {
    background: var(--success-color);
}

.audience-badge.developer {
    background: var(--warning-color);
}

/* ============================================
   Page-Specific: Quick Stats (Miners)
   ============================================ */

.quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.stat-card {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-light);
    margin-top: 0.5rem;
}

/* ============================================
   Page-Specific: Requirements Grid (Miners)
   ============================================ */

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.requirement-card {
    background: var(--bg-light);
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.requirement-card h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.requirement-card p {
    color: var(--text-light);
    margin: 0;
}

/* ============================================
   Page-Specific: Calculator (Miners)
   ============================================ */

.calculator {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 10px;
    margin: 2rem 0;
}

.calculator h3 {
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

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

.calc-input {
    display: flex;
    flex-direction: column;
}

.calc-input label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.calc-input input,
.calc-input select {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--bg-white);
    color: var(--text-dark);
}

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

.calc-result {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
    text-align: center;
}

.calc-result-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--success-color);
}

/* ============================================
   Page-Specific: FAQ (Miners)
   ============================================ */

.faq-item {
    background: var(--bg-light);
    padding: 1.25rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.faq-question {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.faq-answer {
    color: var(--text-light);
    line-height: 1.7;
}

/* ============================================
   Page-Specific: Feature Cards (Clients)
   ============================================ */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
}

/* ============================================
   Page-Specific: Use Case Cards (Clients)
   ============================================ */

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.use-case-card {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 10px;
    border-top: 4px solid var(--primary-color);
}

.use-case-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.use-case-card p {
    color: var(--text-light);
}

/* ============================================
   Page-Specific: Pricing Table (Clients)
   ============================================ */

.pricing-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.pricing-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    text-align: center;
    transition: transform 0.3s ease;
}

.pricing-card.featured {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

.pricing-card h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.pricing-card .price {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.pricing-card .price-unit {
    font-size: 1rem;
    color: var(--text-light);
}

.pricing-card ul {
    list-style: none;
    padding: 0;
    margin-bottom: 2rem;
}

.pricing-card li {
    padding: 0.5rem 0;
    color: var(--text-light);
}

.pricing-card li:before {
    content: "✓";
    color: var(--success-color);
    margin-right: 0.5rem;
}

/* ============================================
   Page-Specific: Tech Stack (Developers)
   ============================================ */

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.tech-item {
    background: var(--bg-light);
    padding: 1.25rem;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
}

.tech-item:hover {
    transform: translateY(-5px);
    background: var(--bg-white);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.tech-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.tech-item span {
    color: var(--text-dark);
    font-weight: 500;
}

/* ============================================
   Page-Specific: Contribution Cards (Developers)
   ============================================ */

.contribution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.contribution-card {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 10px;
    border-left: 4px solid var(--primary-color);
}

.contribution-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.contribution-card ul {
    list-style: none;
    padding: 0;
}

.contribution-card li {
    padding: 0.3rem 0;
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-light);
}

.contribution-card li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* ============================================
   Page-Specific: Reader Cards (Index)
   ============================================ */

.reader-levels {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.reader-card {
    background: var(--bg-white);
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.reader-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
}

.reader-card.miner::before { background: var(--primary-color); }
.reader-card.client::before { background: var(--success-color); }
.reader-card.developer::before { background: var(--warning-color); }
.reader-card.full-doc::before { background: var(--danger-color); }
.reader-card.components::before { background: #8b5cf6; }
.reader-card.flow::before { background: #06b6d4; }

.reader-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.reader-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
    margin-bottom: 1.5rem;
}

.reader-card.miner .reader-icon { background: var(--primary-color); }
.reader-card.client .reader-icon { background: var(--success-color); }
.reader-card.developer .reader-icon { background: var(--warning-color); }
.reader-card.full-doc .reader-icon { background: var(--danger-color); }
.reader-card.components .reader-icon { background: #8b5cf6; }
.reader-card.flow .reader-icon { background: #06b6d4; }

.reader-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.reader-card p {
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.reader-features {
    list-style: none;
    margin-bottom: 2rem;
    padding: 0;
}

.reader-features li {
    padding: 0.5rem 0;
    color: var(--text-light);
    position: relative;
    padding-left: 1.5rem;
}

.reader-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    font-weight: bold;
}

.reader-card.miner .reader-features li::before { color: var(--primary-color); }
.reader-card.client .reader-features li::before { color: var(--success-color); }
.reader-card.developer .reader-features li::before { color: var(--warning-color); }

.reader-card.miner .btn { background: var(--primary-color); }
.reader-card.client .btn { background: var(--success-color); }
.reader-card.developer .btn { background: var(--warning-color); }
.reader-card.full-doc .btn { background: var(--danger-color); }
.reader-card.components .btn { background: #8b5cf6; }
.reader-card.flow .btn { background: #06b6d4; }

/* ============================================
   Page-Specific: Search Bar (Index)
   ============================================ */

.search-container {
    max-width: 600px;
    margin: 0 auto 4rem;
    position: relative;
}

.search-bar {
    width: 100%;
    padding: 1rem 3rem 1rem 1.5rem;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    outline: none;
    transition: all 0.3s;
    background: var(--bg-white);
    color: var(--text-dark);
}

.search-bar:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.search-bar::placeholder {
    color: var(--text-light);
}

.search-icon {
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: 1.2rem;
}

/* ============================================
   Page-Specific: Help Section (Index)
   ============================================ */

.help-section {
    text-align: center;
    padding: 3rem;
    background: var(--bg-white);
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.help-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.help-section p {
    color: var(--text-light);
    margin-bottom: 2rem;
}

.help-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   Responsive: Page-Specific
   ============================================ */

@media (max-width: 768px) {
    .reader-levels {
        grid-template-columns: 1fr;
    }
    
    .calc-row {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .help-buttons {
        flex-direction: column;
        align-items: center;
    }
}