/* ===================================
   VARIABLES & ROOT STYLES
   =================================== */
:root {
    --primary-color: #222f4c;
    --secondary-color: #222f4c;
    --success-color: #222f4c;
    --warning-color: #222f4c;
    --danger-color: #222f4c;
    --info-color: #222f4c;
    
    --text-primary: #222f4c;
    --text-secondary: #222f4c;
    --text-light: #222f4c;
    
    --bg-primary: #ffffff;
    --bg-secondary: #ffffff;
    --bg-tertiary: #ffffff;
    
    --border-color: #222f4c;
    --shadow-sm: 0 1px 2px 0 rgba(34, 47, 76, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(34, 47, 76, 0.15);
    --shadow-lg: 0 10px 15px -3px rgba(34, 47, 76, 0.2);
    
    --sidebar-width: 280px;
    --header-height: 70px;
    
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ===================================
   TYPOGRAPHY
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.1rem; }

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #1a2538;
}

ul, ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* ===================================
   LAYOUT COMPONENTS
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo h1 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--primary-color);
}

.tagline {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: #1a2538;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

/* Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 900;
    transition: transform 0.3s ease;
}

.sidebar-content {
    padding: 1.5rem;
}

/* Search Box */
.search-box {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 2.5rem 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.9rem;
    transition: border-color 0.2s ease;
}

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

.search-icon {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

/* Navigation Menu */
.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-menu li {
    margin-bottom: 0.25rem;
}

.nav-link {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    border-radius: 0.5rem;
    transition: all 0.2s ease;
    font-size: 0.95rem;
}

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

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: 2rem 0;
    min-height: calc(100vh - var(--header-height));
}

/* ===================================
   CONTENT SECTIONS
   =================================== */
.content-section {
    background: var(--bg-primary);
    padding: 2.5rem;
    margin-bottom: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
}

.section-title {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.75rem;
    margin-bottom: 2rem;
}

/* Cover Page */
.cover-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: #222f4c;
    color: white;
    border-radius: 0;
    margin: 0 -2rem 2rem -2rem;
}

.cover-content {
    max-width: 900px;
    padding: 3rem;
    width: 100%;
}

.cover-header {
    margin-bottom: 2rem;
}

.cover-logo-main {
    text-align: center;
    color: white;
}

.cover-main {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.cover-title {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 4px;
    font-weight: 900;
    color: #ffffff;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
}

.cover-divider {
    width: 200px;
    height: 4px;
    background: white;
    margin: 1.5rem auto;
}

.cover-subtitle {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: #ffffff;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.4);
}

.cover-version {
    font-size: 1.25rem;
    font-weight: 400;
    opacity: 0.9;
    margin: 0;
}

.cover-description-box {
    background: rgba(255, 255, 255, 0.15);
    padding: 2rem;
    border-radius: 0.75rem;
    margin-bottom: 3rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.cover-description {
    font-size: 1.15rem;
    margin: 0;
    line-height: 2;
    text-align: left;
}

.cover-description i {
    margin-right: 0.5rem;
    color: rgba(255, 255, 255, 0.9);
}

.cover-contact {
    margin-bottom: 3rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0.75rem;
}

.cover-contact h3 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: #ffffff;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
}

.cover-contact h3 i {
    margin-right: 0.5rem;
}

.cover-contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    font-size: 1rem;
}

.cover-contact-grid div {
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    text-align: center;
}

.cover-contact-grid i {
    margin-right: 0.5rem;
}

.cover-footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid rgba(255, 255, 255, 0.3);
    font-size: 0.9rem;
    opacity: 0.9;
    text-align: center;
}

.cover-footer p {
    margin-bottom: 0.5rem;
}

.cover-footer i {
    margin-right: 0.25rem;
}

/* Table of Contents */
.toc {
    background: var(--bg-primary);
    padding: 2.5rem;
    margin-bottom: 2rem;
    border-radius: 0.75rem;
}

.toc-list {
    max-width: 800px;
}

.toc-item {
    display: flex;
    align-items: baseline;
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
}

.toc-item a {
    color: var(--text-primary);
}

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

.dots {
    flex: 1;
    border-bottom: 2px dotted var(--border-color);
    margin: 0 1rem;
}

.page {
    font-weight: 600;
    color: var(--text-secondary);
}

/* Alert Boxes */
.alert {
    padding: 1.25rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-danger {
    background: #ffffff;
    border-color: #222f4c;
    color: #222f4c;
}

.alert-warning {
    background: #ffffff;
    border-color: #222f4c;
    color: #222f4c;
}

.alert-info {
    background: #ffffff;
    border-color: #222f4c;
    color: #222f4c;
}

.alert h3, .alert h4 {
    margin-top: 0;
    margin-bottom: 0.75rem;
}

/* Highlight Box */
.highlight-box {
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
}

.highlight-box.success {
    background: #ffffff;
    color: #222f4c;
    border: 2px solid #222f4c;
}

.highlight-box h3 {
    margin-top: 0;
    color: inherit;
}

/* Safety Instructions */
.safety-instructions {
    display: grid;
    gap: 1rem;
    margin: 1.5rem 0;
}

.instruction-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
}

.instruction-item .icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: bold;
    flex-shrink: 0;
}

.instruction-item p {
    margin: 0;
}

/* Components Grid */
.components-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.component-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.component-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.component-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

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

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

/* Tables */
.table-responsive {
    overflow-x: auto;
    margin: 1.5rem 0;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    border-radius: 0.5rem;
    overflow: hidden;
}

.specs-table thead {
    background: var(--primary-color);
    color: white;
}

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

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

.specs-table tbody tr:hover {
    background: var(--bg-secondary);
}

/* Software List */
.software-list {
    display: grid;
    gap: 1rem;
    margin: 1.5rem 0;
}

.software-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    align-items: center;
}

.software-icon {
    font-size: 2.5rem;
}

.software-details h4 {
    margin-bottom: 0.25rem;
    color: var(--primary-color);
}

.software-details p {
    margin: 0;
    color: var(--text-secondary);
}

/* Steps List */
.steps-list {
    counter-reset: step-counter;
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}

.steps-list li {
    counter-increment: step-counter;
    position: relative;
    padding-left: 4rem;
    margin-bottom: 2rem;
}

.steps-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 3rem;
    height: 3rem;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
}

.steps-list strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

/* Steps Box */
.steps-box {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 0.75rem;
    margin: 1.5rem 0;
}

.steps-box h4 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Tips Grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.tip-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    border-left: 4px solid var(--primary-color);
}

.tip-card h4 {
    margin-top: 0;
    color: var(--primary-color);
}

.tip-card ul {
    margin: 0;
}

/* Legal Note */
.legal-note {
    background: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    margin: 1.5rem 0;
}

.legal-note h4 {
    margin-top: 0;
    color: var(--text-primary);
}

/* Cleaning Instructions */
.cleaning-instructions {
    display: grid;
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.cleaning-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content h5 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.step-content p {
    margin: 0;
}

/* Troubleshooting */
.troubleshooting-item {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    border-left: 4px solid #222f4c;
}

.troubleshooting-item h4 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.solution {
    margin-top: 1rem;
}

.solution strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

/* AC Features */
.ac-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.feature {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    text-align: center;
}

.feature h4 {
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

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

/* Installation Steps */
.installation-steps {
    margin: 2rem 0;
}

.step {
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    overflow: hidden;
}

.step-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--primary-color);
    color: white;
}

.step-num {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
}

.step-header h4 {
    margin: 0;
    color: white;
}

.step-content {
    padding: 1.5rem;
    background: var(--bg-primary);
}

/* Info Box */
.info-box {
    padding: 1.5rem;
    background: #222f4c;
    color: white;
    border-radius: 0.75rem;
    margin: 2rem 0;
}

.info-box h4 {
    margin-top: 0;
    color: white;
}

.info-box strong {
    color: white;
}

/* Warranty Info */
.warranty-info {
    margin: 2rem 0;
}

.check-list {
    list-style: none;
    padding: 0;
}

.check-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 0.75rem;
}

.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #222f4c;
    font-weight: bold;
    font-size: 1.25rem;
}

.x-list {
    list-style: none;
    padding: 0;
}

.x-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 0.75rem;
}

.x-list li::before {
    content: "✗";
    position: absolute;
    left: 0;
    color: #222f4c;
    font-weight: bold;
    font-size: 1.25rem;
}

/* Service Procedure */
.service-procedure {
    display: grid;
    gap: 1.5rem;
    margin: 2rem 0;
}

.procedure-step {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
}

.proc-number {
    width: 56px;
    height: 56px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: bold;
    flex-shrink: 0;
}

.proc-content h4 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.proc-content p {
    margin-bottom: 0.5rem;
}

/* Contact Box */
.contact-box {
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    margin: 2rem 0;
}

.contact-box h3 {
    margin-top: 0;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 2rem;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
}

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

.contact-item strong {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--primary-color);
}

.contact-item p {
    margin: 0;
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    text-align: center;
}

.footer-logo h3 {
    color: white;
    margin-bottom: 0.5rem;
}

.footer-logo p {
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.footer-info p {
    margin-bottom: 0.5rem;
    opacity: 0.8;
    font-size: 0.9rem;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

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

.back-to-top:hover {
    background: #1a2538;
    transform: translateY(-4px);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

/* Tablet */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .content-section {
        padding: 2rem;
    }
    
    .cover-title {
        font-size: 2.5rem;
    }
    
    .cover-subtitle {
        font-size: 1.5rem;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .header-actions .btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
    
    .header-actions .btn span:not(.icon) {
        display: none;
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .content-section {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.25rem; }
    
    .cover-page {
        margin: 0 -1rem 1.5rem -1rem;
    }
    
    .cover-content {
        padding: 2rem 1rem;
    }
    
    .cover-title {
        font-size: 2.5rem;
        letter-spacing: 2px;
    }
    
    .cover-subtitle {
        font-size: 1.75rem;
        letter-spacing: 2px;
    }
    
    .cover-version {
        font-size: 1rem;
    }
    
    .cover-description {
        font-size: 0.95rem;
    }
    
    .cover-contact-grid {
        grid-template-columns: 1fr;
    }
    
    .components-grid,
    .tips-grid,
    .ac-features {
        grid-template-columns: 1fr;
    }
    
    .contact-details {
        grid-template-columns: 1fr;
    }
    
    .steps-list li {
        padding-left: 3.5rem;
    }
    
    .steps-list li::before {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.25rem;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 44px;
        height: 44px;
    }
    
    .software-item {
        flex-direction: column;
        text-align: center;
    }
    
    .cleaning-item,
    .procedure-step {
        flex-direction: column;
        text-align: center;
    }
    
    .step-number,
    .proc-number {
        margin: 0 auto;
    }
    
    .step-header {
        flex-direction: column;
        text-align: center;
    }
}

/* Small mobile */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .header-actions {
        gap: 0.5rem;
    }
    
    .btn svg {
        width: 18px;
        height: 18px;
    }
    
    .toc-item {
        font-size: 0.95rem;
    }
    
    .instruction-item {
        flex-direction: column;
    }
}

/* Utility Classes */
.no-print {
    /* Will be hidden in print.css */
    display: block;
}

.page-break {
    /* Will have page-break in print.css */
    display: block;
}