/* ==========================================================================
   CrystalDiskMark Official Website - Stylesheet
   Version: 1.0.0
   Color Palette: Based on CrystalDiskMark logo (Blue + Cyan Crystal)
   Style: Flat, Modern, Professional
   ========================================================================== */

/* ---------- CSS Variables ---------- */
:root {
    /* Primary Brand Colors - Based on Logo */
    --primary: #0078D7;
    --primary-dark: #005A9E;
    --primary-light: #4DA8E8;
    --primary-lighter: #E8F4FC;
    
    /* Accent Colors - Crystal Cyan */
    --accent: #00BCD4;
    --accent-dark: #0097A7;
    --accent-light: #4DD0E1;
    
    /* Neutral Colors */
    --dark: #1A2332;
    --gray-900: #212121;
    --gray-800: #424242;
    --gray-700: #616161;
    --gray-600: #757575;
    --gray-500: #9E9E9E;
    --gray-400: #BDBDBD;
    --gray-300: #E0E0E0;
    --gray-200: #EEEEEE;
    --gray-100: #F5F7FA;
    --gray-50: #FAFBFC;
    --white: #FFFFFF;
    
    /* Status Colors */
    --success: #2E7D32;
    --success-light: #E8F5E9;
    --warning: #ED6C02;
    --warning-light: #FFF3E0;
    --danger: #C62828;
    --danger-light: #FFEBEE;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0078D7 0%, #00BCD4 100%);
    --gradient-dark: linear-gradient(135deg, #1A2332 0%, #0078D7 100%);
    --gradient-hero: linear-gradient(135deg, #005A9E 0%, #0078D7 50%, #00BCD4 100%);
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    --font-mono: "SF Mono", Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    --shadow-primary: 0 8px 20px rgba(0, 120, 215, 0.3);
    
    /* Layout */
    --container-max: 1200px;
    --header-height: 64px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-800);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

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

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

h2 {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

h4 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

p {
    margin-bottom: var(--space-md);
}

/* ---------- Layout Utilities ---------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.section {
    padding: var(--space-4xl) 0;
}

.section-sm {
    padding: var(--space-2xl) 0;
}

.section-gray {
    background-color: var(--gray-100);
}

.section-dark {
    background-color: var(--dark);
    color: var(--white);
}

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

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

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---------- Section Header ---------- */
.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto var(--space-3xl);
}

.section-header h2 {
    font-size: 2.25rem;
    margin-bottom: var(--space-md);
}

.section-header .subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--space-md);
}

.section-header .badge {
    display: inline-block;
    padding: 0.375rem 1rem;
    background-color: var(--primary-lighter);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    letter-spacing: 0.5px;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    text-align: center;
    border: 2px solid transparent;
    white-space: nowrap;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 25px rgba(0, 120, 215, 0.4);
    color: var(--white);
}

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

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

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

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

.btn-ghost {
    background-color: transparent;
    color: var(--gray-700);
}

.btn-ghost:hover {
    background-color: var(--gray-100);
    color: var(--primary);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* ---------- Header / Navigation ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: all var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-max);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--dark);
    text-decoration: none;
}

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

.nav-logo-icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: 5px;
}
.footer-brand img{border-radius: 5px;}
.nav-logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}
button { outline: none } 
.nav-logo-text small {
    font-size: 0.7rem;
    color: var(--gray-600);
    font-weight: 400;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav-menu a {
    padding: 0.5rem 1rem;
    color: var(--gray-700);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--primary);
    background-color: var(--primary-lighter);
}

.nav-menu a.active {
    color: var(--primary);
    background-color: var(--primary-lighter);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-download-btn {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--dark);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero Section ---------- */
.hero {
    position: relative;
    padding: calc(var(--header-height) + var(--space-4xl)) 0 var(--space-4xl);
    background: var(--gradient-hero);
    color: var(--white);
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 188, 212, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.hero-content {
    max-width: 540px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 1rem;
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    margin-bottom: var(--space-lg);
    backdrop-filter: blur(10px);
}

.hero-badge::before {
    content: "";
    width: 8px;
    height: 8px;
    background-color: #4ADE80;
    border-radius: 50%;
    box-shadow: 0 0 8px #4ADE80;
}

.hero h1 {
    color: var(--white);
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.hero h1 .highlight {
    background: linear-gradient(135deg, #4DD0E1 0%, #FFFFFF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-xl);
}

.hero-stats {
    display: flex;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.hero-stat {
    display: flex;
    flex-direction: column;
}

.hero-stat-num {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
    line-height: 1.2;
}

.hero-stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.75);
}

.hero-image {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-screenshot {
    width: 100%;
    max-width: 540px;
    border-radius: var(--radius-lg);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    background-color: var(--white);
    overflow: hidden;
}

/* ---------- Features Cards ---------- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.feature-card {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-lighter);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    color: var(--primary);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* ---------- Use Cases ---------- */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.use-case-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--gray-200);
}

.use-case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.use-case-visual {
    height: 160px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.use-case-visual svg {
    width: 64px;
    height: 64px;
    opacity: 0.9;
}

.use-case-visual::after {
    content: "";
    position: absolute;
    top: 0%;
    right: 0%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}

.use-case-body {
    padding: var(--space-lg);
}

.use-case-body h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
}

.use-case-body p {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.use-case-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--primary-lighter);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

/* ---------- Testimonials / Reviews ---------- */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-xl);
}

.testimonial-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    position: relative;
    transition: all var(--transition-base);
}

.testimonial-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.testimonial-quote-icon {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    color: var(--primary-lighter);
    opacity: 0.6;
}

.testimonial-rating {
    display: flex;
    gap: 2px;
    margin-bottom: var(--space-md);
    color: #FFB400;
}

.testimonial-content {
    color: var(--gray-700);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: var(--space-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.testimonial-author-info {
    display: flex;
    flex-direction: column;
}

.testimonial-author-name {
    font-weight: 600;
    color: var(--dark);
    font-size: 0.95rem;
}

.testimonial-author-role {
    color: var(--gray-600);
    font-size: 0.8rem;
}

/* ---------- Stats Section ---------- */
.stats-section {
    background: var(--gradient-dark);
    color: var(--white);
    padding: var(--space-3xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-xl);
    text-align: center;
}

.stat-item {
    padding: var(--space-md);
}

.stat-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1.2;
    margin-bottom: var(--space-xs);
}

.stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

/* ---------- Download Modal ---------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(26, 35, 50, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--space-lg);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
	  left: 0;
	  right: 0;
	  top: 0;
	  bottom: 0;
}

.modal {
    background-color: var(--white);
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

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

.modal-header {
    padding: var(--space-xl) var(--space-xl) var(--space-md);
    text-align: center;
    border-bottom: 1px solid var(--gray-200);
    position: relative;
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-600);
    font-size: 1.5rem;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--gray-100);
    color: var(--dark);
}

.modal-header h3 {
    font-size: 1.5rem;
    color: var(--dark);
    margin-bottom: var(--space-xs);
}

.modal-header p {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-bottom: 0;
}

.modal-body {
    padding: var(--space-xl);
}

.qr-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.qr-item {
    text-align: center;
    padding: var(--space-lg);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.qr-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.qr-image {
    width: 160px;
    height: 160px;
    margin: 0 auto var(--space-md);
    background-color: var(--white);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    border: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
}

.qr-image img,
.qr-image svg {
    width: 100%;
    height: 100%;
}

.qr-item h4 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
    color: var(--dark);
}

.qr-item p {
    font-size: 0.8rem;
    color: var(--gray-600);
    margin-bottom: 0;
}

.modal-footer {
    padding: var(--space-lg) var(--space-xl);
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    text-align: center;
}

.modal-footer p {
    font-size: 0.85rem;
    color: var(--gray-600);
    margin-bottom: var(--space-sm);
}

.modal-version-info {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.5rem 1rem;
    background-color: var(--primary-lighter);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
}

/* ---------- Download Center Page ---------- */
.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

.download-card {
    background-color: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-base);
    position: relative;
}

.download-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-primary);
}

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

.download-card-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.25rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.download-card-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.download-card-header h3 {
    font-size: 1.5rem;
    color: var(--dark);
    margin-bottom: var(--space-xs);
}

.download-card-header p {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.download-card-version {
    text-align: center;
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background-color: var(--gray-100);
    border-radius: var(--radius-md);
}

.download-card-version .version-num {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    display: block;
}

.download-card-version .version-date {
    font-size: 0.8rem;
    color: var(--gray-600);
}

.download-card-features {
    margin-bottom: var(--space-lg);
}

.download-card-features li {
    padding: var(--space-sm) 0;
    padding-left: var(--space-xl);
    color: var(--gray-700);
    font-size: 0.9rem;
    position: relative;
    border-bottom: 1px solid var(--gray-100);
}

.download-card-features li:last-child {
    border-bottom: none;
}

.download-card-features li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background-color: var(--success-light);
    border-radius: 50%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232E7D32' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: 14px;
    background-position: center;
    background-repeat: no-repeat;
}

/* ---------- Specs Table ---------- */
.specs-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.specs-table th,
.specs-table td {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

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

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

.specs-table tr:nth-child(even) td {
    background-color: var(--gray-50);
}

.specs-table td:first-child {
    font-weight: 600;
    color: var(--dark);
    width: 30%;
}

/* ---------- Version History ---------- */
.version-timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: var(--space-xl);
}

.version-timeline::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
}

.version-item {
    position: relative;
    padding-bottom: var(--space-xl);
}

.version-item::before {
    content: "";
    position: absolute;
    left: -29px;
    top: 6px;
    width: 16px;
    height: 16px;
    background-color: var(--white);
    border: 3px solid var(--primary);
    border-radius: 50%;
    z-index: 1;
}

.version-item-content {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

.version-item-content h4 {
    color: var(--primary);
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.version-date {
    font-size: 0.8rem;
    color: var(--gray-600);
    font-weight: 400;
}

.version-item-content ul {
    margin-top: var(--space-sm);
    padding-left: var(--space-md);
}

.version-item-content li {
    list-style: disc;
    color: var(--gray-700);
    font-size: 0.9rem;
    padding: 2px 0;
}

/* ---------- Tutorial Steps ---------- */
.tutorial-steps {
    counter-reset: step;
    max-width: 800px;
    margin: 0 auto;
}

.tutorial-step {
    display: flex;
    gap: var(--space-xl);
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--gray-200);
    position: relative;
}

.tutorial-step:last-child {
    border-bottom: none;
}

.tutorial-step-num {
    counter-increment: step;
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.tutorial-step-num::before {
    content: counter(step);
}

.tutorial-step-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--dark);
}

.tutorial-step-content p {
    color: var(--gray-700);
    margin-bottom: var(--space-sm);
}

.tutorial-step-content .tip {
    background-color: var(--warning-light);
    border-left: 4px solid var(--warning);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    margin-top: var(--space-md);
    font-size: 0.9rem;
}

.tutorial-step-content .tip strong {
    color: var(--warning);
}

/* ---------- Info Cards ---------- */
.info-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
    height: 100%;
}

.info-card:hover {
    box-shadow: var(--shadow-md);
}

.info-card-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-lighter);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.info-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
}

.info-card p {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* ---------- FAQ ---------- */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item.active {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.faq-question {
    padding: var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    color: var(--dark);
    font-size: 1rem;
    transition: color var(--transition-fast);
}

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

.faq-question .faq-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-base);
    color: var(--primary);
}

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

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

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-content {
    padding: 0 var(--space-lg) var(--space-lg);
    color: var(--gray-700);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ---------- Page Header (sub-pages) ---------- */
.page-header {
    background: var(--gradient-hero);
    color: var(--white);
    padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-3xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 188, 212, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.page-header::after {
    content: "";
    position: absolute;
    bottom: -100px;
    left: 0;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.page-header-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.page-header h1 {
    color: var(--white);
    font-size: 2.75rem;
    margin-bottom: var(--space-md);
}

.page-header p {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.9);
}

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

.breadcrumb span {
    color: rgba(255, 255, 255, 0.5);
}

/* ---------- CTA Section ---------- */
.cta-section {
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--space-3xl) 0;
    text-align: center;
}

.cta-section h2 {
    color: var(--white);
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: var(--space-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ---------- Footer ---------- */
.site-footer {
    background-color: var(--dark);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h3 {
    color: var(--white);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.footer-social {
    display: flex;
    gap: var(--space-sm);
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background-color: var(--primary);
    transform: translateY(-2px);
}

.footer-col h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: var(--space-md);
}

.footer-col ul li {
    margin-bottom: var(--space-sm);
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
    color: var(--accent-light);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
    font-size: 0.85rem;
}

.footer-bottom-links {
    display: flex;
    gap: var(--space-md);
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom-links a:hover {
    color: var(--white);
}

/* ---------- Misc ---------- */
.divider {
    height: 1px;
    background-color: var(--gray-200);
    margin: var(--space-2xl) 0;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background-color: var(--primary-lighter);
    color: var(--primary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: var(--space-xs);
}

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

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

/* ---------- Two Column Layout ---------- */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.two-col-content h2 {
    margin-bottom: var(--space-md);
}

.two-col-content p {
    color: var(--gray-700);
    margin-bottom: var(--space-md);
}

.two-col-content ul {
    margin-top: var(--space-md);
}

.two-col-content ul li {
    padding: var(--space-sm) 0;
    padding-left: var(--space-xl);
    position: relative;
    color: var(--gray-700);
}

.two-col-content ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    background-color: var(--primary-lighter);
    border-radius: 50%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230078D7' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: 14px;
    background-position: center;
    background-repeat: no-repeat;
}

.two-col-visual {
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    color: var(--white);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

/* ---------- Notice Banner ---------- */
.notice {
    background-color: var(--primary-lighter);
    border-left: 4px solid var(--primary);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-lg);
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.notice-icon {
    flex-shrink: 0;
    color: var(--primary);
    margin-top: 2px;
}

.notice-content {
    flex: 1;
}

.notice-content strong {
    color: var(--primary-dark);
}

.notice-content p {
    margin-bottom: 0;
    color: var(--gray-700);
    font-size: 0.9rem;
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    :root {
        --space-4xl: 4rem;
        --space-3xl: 3rem;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--white);
        flex-direction: column;
        align-items: stretch;
        padding: var(--space-lg);
        gap: var(--space-xs);
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform var(--transition-base);
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .nav-menu a {
        padding: var(--space-md);
        border-radius: var(--radius-md);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-download-btn {
        display: none;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-stats {
        gap: var(--space-lg);
    }
    
    .hero-stat-num {
        font-size: 1.5rem;
    }
    
    .two-col {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .qr-row {
        grid-template-columns: 1fr;
    }
    
    .section-header h2 {
        font-size: 1.75rem;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .container {
        padding: 0 var(--space-md);
    }
    
    .stat-num {
        font-size: 2rem;
    }
    
    .tutorial-step {
        gap: var(--space-md);
    }
    
    .tutorial-step-num {
        width: 44px;
        height: 44px;
        font-size: 1.125rem;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-actions .btn {
        width: 100%;
    }
    
    .modal {
        margin: var(--space-md);
    }
    
    .modal-body {
        padding: var(--space-md);
    }
    
    .qr-image {
        width: 120px;
        height: 120px;
    }
}

/* ---------- Print Optimization ---------- */
@media print {
    .site-header,
    .site-footer,
    .nav-toggle,
    .modal-overlay,
    .cta-section {
        display: none !important;
    }
    
    body {
        color: #000;
        background: #fff;
    }
    
    a {
        text-decoration: underline;
    }
}