/* ============================================
   Hong Kong AC Repair Guide - Styles
   Modern, Clean, Professional Design
   ============================================ */

/* CSS Variables */
:root {
    --primary-color: #0077B6;
    --primary-dark: #005f8a;
    --primary-light: #00B4D8;
    --secondary-color: #023E8A;
    --accent-color: #48CAE4;
    --success-color: #2ECC71;
    --warning-color: #F39C12;
    --danger-color: #E74C3C;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-light: #6c6c8a;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #eef2f7;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

a:hover {
    color: var(--primary-dark);
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0077B6 0%, #023E8A 50%, #00B4D8 100%);
    overflow: hidden;
    padding: 6rem 1.5rem 4rem;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    text-align: center;
    color: white;
    max-width: 800px;
    z-index: 1;
}

.hero-title {
    color: white;
    margin-bottom: 1rem;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    letter-spacing: 0.1em;
}

.hero-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.hero-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.floating-icon {
    position: absolute;
    font-size: 3rem;
    opacity: 0.2;
    animation: float 6s ease-in-out infinite;
}

.icon-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.icon-2 {
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.icon-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--bg-tertiary);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    color: white;
}

/* ============================================
   Stats Section
   ============================================ */
.stats {
    background: var(--bg-secondary);
    padding: 3rem 0;
    margin-top: -4rem;
    position: relative;
    z-index: 10;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: inline;
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-suffix {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ============================================
   Section Styles
   ============================================ */
.section {
    padding: 5rem 0;
}

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

.section-title {
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Problems Section
   ============================================ */
.problems {
    background: var(--bg-secondary);
}

.problem-filter {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.625rem 1.5rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.problem-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.problem-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.problem-card.hidden {
    display: none;
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.problem-card h3 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

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

.problem-causes {
    margin-bottom: 1.5rem;
}

.problem-causes li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

.problem-causes li::before {
    content: '•';
    position: absolute;
    left: 0.5rem;
    color: var(--primary-color);
}

.btn-learn-more {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--primary-color);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* ============================================
   Diagnosis Tool Section
   ============================================ */
.diagnosis {
    background: linear-gradient(180deg, white 0%, var(--bg-secondary) 100%);
}

.diagnosis-tool {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.diagnosis-progress {
    margin-bottom: 2rem;
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    transition: width var(--transition-normal);
    width: 20%;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-light);
}

.question-card {
    display: none;
    animation: fadeIn 0.3s ease;
}

.question-card.active {
    display: block;
}

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

.question-title {
    margin-bottom: 1.5rem;
    text-align: center;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.option-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

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

.option-icon {
    font-size: 2rem;
}

.option-text {
    font-weight: 500;
    color: var(--text-primary);
    text-align: center;
}

.btn-back {
    display: block;
    margin: 1.5rem auto 0;
    padding: 0.5rem 1rem;
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.btn-back:hover {
    color: var(--primary-color);
}

.diagnosis-result {
    display: none;
    animation: fadeIn 0.3s ease;
}

.diagnosis-result.active {
    display: block;
}

.result-card {
    text-align: center;
}

.result-header {
    margin-bottom: 1.5rem;
}

.result-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 0.5rem;
}

.result-content {
    text-align: left;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.result-content h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.result-content ul {
    margin: 1rem 0;
}

.result-content li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.result-content li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
}

.severity-indicator {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.severity-low {
    background: #d4edda;
    color: #155724;
}

.severity-medium {
    background: #fff3cd;
    color: #856404;
}

.severity-high {
    background: #f8d7da;
    color: #721c24;
}

/* ============================================
   Maintenance Section
   ============================================ */
.maintenance {
    background: white;
}

.maintenance-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.maintenance-timeline::before {
    content: '';
    position: absolute;
    left: 120px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.timeline-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
    position: relative;
}

.timeline-marker {
    flex-shrink: 0;
    width: 100px;
    text-align: right;
}

.marker-icon {
    display: block;
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.marker-text {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.9rem;
}

.timeline-content {
    flex: 1;
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    position: relative;
    margin-left: 30px;
}

.timeline-content::before {
    content: '';
    position: absolute;
    left: -10px;
    top: 20px;
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
}

.timeline-content h3 {
    margin-bottom: 0.75rem;
}

.timeline-content > p {
    margin-bottom: 1rem;
}

.tip-steps {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.step {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
}

.step-number {
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

.step-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.maintenance-tips {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.tip-tag {
    background: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.warning-box {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: #fff3cd;
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-top: 1rem;
}

.warning-icon {
    font-size: 1.25rem;
}

.warning-text {
    font-size: 0.9rem;
    color: #856404;
}

.benefits-list {
    margin-top: 1rem;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.benefit-icon {
    color: var(--success-color);
    font-weight: 700;
}

.benefit-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Energy Tips */
.energy-tips {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    color: white;
}

.tips-title {
    text-align: center;
    color: white;
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.tip-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    text-align: center;
    transition: transform var(--transition-normal);
}

.tip-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
}

.tip-card .tip-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.tip-card h4 {
    color: white;
    margin-bottom: 0.75rem;
}

.tip-card p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
    margin: 0;
}

/* ============================================
   Cost Section
   ============================================ */
.cost {
    background: var(--bg-secondary);
}

.cost-disclaimer {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: #e7f5ff;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 2.5rem;
    border-left: 4px solid var(--primary-color);
}

.disclaimer-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.cost-disclaimer p {
    margin: 0;
    color: var(--text-secondary);
}

.cost-calculator {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-md);
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow-sm);
}

.cost-calculator h3 {
    margin-bottom: 1.5rem;
    text-align: center;
}

.calculator-form {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-end;
}

.form-group {
    flex: 1;
    min-width: 200px;
}

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

.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    color: var(--text-primary);
    background: white;
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

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

.calculator-result {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-top: 1.5rem;
}

.result-text {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin: 0;
}

.result-text strong {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.cost-table-container {
    overflow-x: auto;
    margin-bottom: 2rem;
}

.cost-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.cost-table th,
.cost-table td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

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

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

.cost-table tr:hover td {
    background: var(--bg-tertiary);
}

.cost-table td:first-child {
    font-weight: 500;
    color: var(--text-primary);
}

.cost-notes {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.cost-notes h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.cost-notes ul {
    list-style: disc;
    padding-left: 1.5rem;
}

.cost-notes li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* ============================================
   FAQ Section
   ============================================ */
.faq {
    background: white;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-color);
    transition: transform var(--transition-normal);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding-bottom: 1.5rem;
}

.faq-answer p {
    margin-bottom: 0.75rem;
}

.faq-answer ul,
.faq-answer ol {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
}

.faq-answer ul {
    list-style: disc;
}

.faq-answer ol {
    list-style: decimal;
}

.faq-answer li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

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

.comparison-table th,
.comparison-table td {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    text-align: center;
}

.comparison-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.comparison-table tr:hover td {
    background: var(--bg-secondary);
}

/* ============================================
   SEO Description Section
   ============================================ */
.seo-description {
    background: var(--bg-secondary);
    padding: 4rem 0;
}

.seo-content {
    max-width: 900px;
    margin: 0 auto;
}

.seo-content h2 {
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 1.75rem;
}

.seo-content p {
    text-align: justify;
    line-height: 1.9;
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--text-primary);
    color: rgba(255, 255, 255, 0.8);
    padding: 4rem 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2.5rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-section h4 {
    color: white;
    margin-bottom: 1.25rem;
    font-size: 1.1rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.disclaimer {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding: 1.5rem 0;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
    margin: 0;
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ============================================
   Modal
   ============================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: white;
    border-radius: var(--radius-lg);
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.modal-close:hover {
    background: var(--danger-color);
    color: white;
}

.modal-body {
    padding: 2rem;
}

.modal-body h3 {
    margin-bottom: 1rem;
    padding-right: 2rem;
}

.modal-body h4 {
    color: var(--primary-color);
    margin: 1.5rem 0 0.75rem;
}

.modal-body ul {
    list-style: disc;
    padding-left: 1.5rem;
}

.modal-body li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 992px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .maintenance-timeline::before {
        left: 20px;
    }

    .timeline-marker {
        width: auto;
        text-align: left;
        position: absolute;
        left: 0;
    }

    .timeline-item {
        flex-direction: column;
        padding-left: 60px;
    }

    .timeline-content {
        margin-left: 0;
    }

    .timeline-content::before {
        left: -50px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1.5rem;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-link {
        display: block;
        padding: 1rem 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 8rem 1.5rem 5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .stats {
        margin-top: -3rem;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        padding: 1.5rem;
        gap: 1.5rem;
    }

    .stat-number {
        font-size: 2rem;
    }

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

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

    .section {
        padding: 3.5rem 0;
    }

    .calculator-form {
        flex-direction: column;
    }

    .form-group {
        width: 100%;
    }

    .cost-table th,
    .cost-table td {
        padding: 0.75rem;
        font-size: 0.875rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .footer-links li {
        margin: 0;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

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

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

    .tip-steps {
        flex-direction: column;
    }

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

    .energy-tips {
        padding: 1.5rem;
    }

    .diagnosis-tool {
        padding: 1.5rem;
    }

    .modal-body {
        padding: 1.5rem;
    }

    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 44px;
        height: 44px;
    }
}

/* ============================================
   Accessibility
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .navbar,
    .hero-decoration,
    .back-to-top,
    .btn,
    .filter-btn,
    .diagnosis-tool,
    .cost-calculator {
        display: none !important;
    }

    body {
        font-size: 12pt;
        color: black;
    }

    .section {
        padding: 1rem 0;
        page-break-inside: avoid;
    }

    .hero {
        min-height: auto;
        padding: 2rem;
        background: none;
        color: black;
    }

    .hero-title,
    .hero-subtitle,
    .hero-description {
        color: black;
    }
}

/* ============================================
   Breadcrumb Navigation
   ============================================ */
.breadcrumb {
    background: var(--bg-tertiary);
    padding: 0.75rem 0;
    font-size: 0.875rem;
    margin-top: 70px;
}

.breadcrumb-home {
    display: none;
}

.breadcrumb a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.breadcrumb span {
    color: var(--text-light);
}

/* ============================================
   Contextual Intro Section
   ============================================ */
.contextual-intro {
    background: white;
    padding: 3rem 0;
}

.intro-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.intro-content h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.intro-content p {
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 1rem;
    text-align: justify;
}

/* ============================================
   User Guide Section
   ============================================ */
.user-guide {
    margin-top: 3rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.user-guide h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.guide-step {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.step-num {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.step-content h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.6;
}

.guide-faq {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.guide-faq h3 {
    margin-bottom: 1.5rem;
}

.guide-faq-item {
    background: white;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.guide-faq-item:last-child {
    margin-bottom: 0;
}

.guide-faq-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.guide-faq-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.6;
}

/* ============================================
   Latest Articles Section
   ============================================ */
.latest-articles {
    background: white;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.article-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.article-content {
    padding: 1.5rem;
}

.article-category {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.article-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    line-height: 1.4;
}

.article-card h3 a {
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.article-card h3 a:hover {
    color: var(--primary-color);
}

.article-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.article-date {
    font-size: 0.8rem;
    color: var(--text-light);
}

.articles-cta {
    text-align: center;
}

.btn-secondary-dark {
    background: var(--text-primary);
    color: white;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-xl);
    font-weight: 600;
    transition: all var(--transition-normal);
    display: inline-block;
}

.btn-secondary-dark:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* ============================================
   Blog Index Page
   ============================================ */
.blog-index {
    padding-top: 2rem;
}

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

.page-header h1 {
    margin-bottom: 1rem;
}

.page-header .lead {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-card-content {
    padding: 1.5rem;
}

.blog-card-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.8rem;
}

.blog-card-category {
    color: var(--primary-color);
    font-weight: 600;
}

.blog-card-date {
    color: var(--text-light);
}

.blog-card h2 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.blog-card h2 a {
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.blog-card h2 a:hover {
    color: var(--primary-color);
}

.blog-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.blog-card .read-more {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.blog-card .read-more:hover {
    color: var(--primary-dark);
}

/* ============================================
   Blog Post Page
   ============================================ */
.blog-post {
    padding: 3rem 0;
}

.post-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.post-header h1 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.post-meta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    color: var(--text-light);
    font-size: 0.9rem;
}

.post-category {
    color: var(--primary-color);
    font-weight: 600;
}

.post-content {
    max-width: 800px;
    margin: 0 auto;
}

.post-content .lead {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.post-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.post-content h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.post-content p {
    margin-bottom: 1.25rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.post-content ul,
.post-content ol {
    margin: 1rem 0 1.5rem 1.5rem;
}

.post-content ul {
    list-style: disc;
}

.post-content ol {
    list-style: decimal;
}

.post-content li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.post-content a {
    color: var(--primary-color);
    text-decoration: underline;
}

.post-content a:hover {
    color: var(--primary-dark);
}

.post-cta {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    margin: 3rem 0;
}

.post-cta h3 {
    color: white;
    margin-bottom: 0.5rem;
}

.post-cta p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
}

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

.post-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-xl);
    font-size: 0.8rem;
}

.post-navigation {
    display: flex;
    justify-content: space-between;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    gap: 1rem;
    flex-wrap: wrap;
}

.post-navigation a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.post-navigation a:hover {
    color: var(--primary-color);
}

.nav-prev,
.nav-next {
    max-width: 45%;
}

/* ============================================
   Legal Pages (Privacy, Terms)
   ============================================ */
.legal-page {
    padding: 3rem 0;
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h1 {
    text-align: center;
    margin-bottom: 0.5rem;
}

.last-updated {
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.legal-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.35rem;
    color: var(--text-primary);
}

.legal-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.legal-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.legal-content ul {
    list-style: disc;
    margin: 1rem 0 1.5rem 1.5rem;
}

.legal-content li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.legal-content a {
    color: var(--primary-color);
}

/* ============================================
   About Page
   ============================================ */
.about-page {
    padding: 3rem 0;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

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

.page-header-simple h1 {
    margin-bottom: 1rem;
}

.page-header-simple .lead {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.about-section {
    margin-bottom: 3rem;
}

.about-section h2 {
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.about-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

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

.feature-item {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    text-align: center;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-item h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.feature-item p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.value-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.value-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.value-item h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.value-item p {
    font-size: 0.875rem;
    margin: 0;
}

/* ============================================
   Contact Page
   ============================================ */
.contact-page {
    padding: 3rem 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1100px;
    margin: 0 auto;
}

.contact-info {
    /* Left column */
}

.contact-section {
    margin-bottom: 2.5rem;
}

.contact-section h2 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.notice-box {
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.notice-box p {
    margin: 0;
    color: #856404;
    font-size: 0.95rem;
}

.contact-list {
    list-style: none;
}

.contact-list li {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.contact-list li:last-child {
    border-bottom: none;
}

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-list h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.contact-list p {
    font-size: 0.9rem;
    margin: 0;
    color: var(--text-secondary);
}

.contact-faq .faq-item {
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.contact-faq .faq-item h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.contact-faq .faq-item p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.contact-form-section {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
}

.contact-form-section h2 {
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.contact-form .form-group {
    margin-bottom: 1.25rem;
}

.contact-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    color: var(--text-primary);
    background: white;
    transition: border-color var(--transition-fast);
    font-family: inherit;
}

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

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.form-note {
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-light);
}

.form-note p {
    margin-bottom: 0.25rem;
}

.form-note a {
    color: var(--primary-color);
}

.contact-form .btn {
    width: 100%;
}

.form-message {
    display: none;
    margin-top: 1rem;
    padding: 1rem;
    border-radius: var(--radius-sm);
}

.form-message .success {
    background: #d4edda;
    color: #155724;
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin: 0;
}

/* ============================================
   Responsive - New Components
   ============================================ */
@media (max-width: 992px) {
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .breadcrumb {
        margin-top: 65px;
    }

    .guide-steps {
        grid-template-columns: 1fr;
    }

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

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

    .post-navigation {
        flex-direction: column;
    }

    .nav-prev,
    .nav-next {
        max-width: 100%;
    }

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

    .values-list {
        grid-template-columns: 1fr;
    }

    .contact-form-section {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .user-guide {
        padding: 1.5rem;
    }

    .guide-step {
        flex-direction: column;
        text-align: center;
    }

    .post-content .lead {
        padding: 1rem;
    }

    .post-cta {
        padding: 1.5rem;
    }
}