/* ========================================
   WinMemoryCleaner - 蓝白黑配色方案
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Blue, White, Black */
    --primary: #0066CC;
    --primary-dark: #004C99;
    --primary-light: #3399FF;
    --secondary: #1A1A2E;
    --accent: #16213E;

    --white: #FFFFFF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --black: #000000;

    /* Semantic Colors */
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #3B82F6;

    /* Typography */
    --font-sans: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Container */
    --container-max: 1200px;
}

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

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--secondary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

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

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

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--secondary);
    text-decoration: none;
}
.logo img{max-width:60px;}
.logo:hover {
    color: var(--primary);
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-menu a {
    display: inline-block;
    padding: var(--spacing-sm) 0;
    font-weight: 500;
    color: var(--gray-600);
    text-decoration: none;
    position: relative;
}

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

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
    text-decoration: none;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--secondary);
    transition: var(--transition-fast);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 50%, var(--gray-100) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-title {
    margin-bottom: var(--spacing-lg);
}

.hero-title-main {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-sub {
    display: block;
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--gray-600);
    margin-top: var(--spacing-sm);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

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

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.gauge-circle {
    position: relative;
    width: 280px;
    height: 280px;
}

.gauge-circle svg {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.gauge-bg {
    fill: none;
    stroke: var(--gray-200);
    stroke-width: 20;
}

.gauge-fill {
    fill: none;
    stroke: var(--primary);
    stroke-width: 20;
    stroke-linecap: round;
    stroke-dasharray: 565.48;
    stroke-dashoffset: calc(565.48 * (1 - var(--percent) / 100));
    transition: stroke-dashoffset 1s ease;
}

.gauge-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.gauge-value {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    color: var(--secondary);
}

.gauge-label {
    font-size: 1rem;
    color: var(--gray-500);
}

.gauge-tip {
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--gray-400);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn svg {
    width: 20px;
    height: 20px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: var(--white);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--gray-800);
    border-color: var(--gray-800);
    color: var(--white);
    text-decoration: none;
}

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

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    text-decoration: none;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* ========================================
   Sections
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-500);
}

.section-title-small {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-xl);
}

.section-title-small svg {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

/* Features Section */
.features {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.feature-card {
    padding: var(--spacing-xl);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

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

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.feature-icon svg {
    width: 30px;
    height: 30px;
    color: var(--white);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
}

.feature-desc {
    color: var(--gray-600);
    line-height: 1.7;
}

/* Memory Areas Section */
.memory-areas {
    padding: var(--spacing-3xl) 0;
    background: var(--gray-50);
}

.areas-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.area-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
    box-shadow: var(--shadow-sm);
}

.area-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: var(--white);
    font-weight: 700;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.area-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-xs);
}

.area-content p {
    color: var(--gray-600);
    font-size: 0.9375rem;
}

/* Scenarios Section */
.scenarios {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.scenario-card {
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
    border-radius: var(--radius-lg);
    color: var(--white);
    transition: transform var(--transition-normal);
}

.scenario-card:hover {
    transform: translateY(-5px);
}

.scenario-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.scenario-icon svg {
    width: 24px;
    height: 24px;
}

.scenario-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.scenario-card p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* Comparison Section */
.comparison {
    padding: var(--spacing-3xl) 0;
    background: var(--gray-50);
}

.comparison-table-wrapper {
    overflow-x: auto;
}

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

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

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

.comparison-table td.highlight {
    color: var(--primary);
    font-weight: 600;
}

.comparison-table tbody tr:hover {
    background: var(--gray-50);
}

/* CTA Section */
.cta {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.cta-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

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

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

.cta-note {
    display: block;
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

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

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

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

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

/* ========================================
   Page Header
   ======================================== */
.page-header {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   Download Page
   ======================================== */
.download-section {
    padding: var(--spacing-3xl) 0;
}

.version-info {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
    border: 1px solid var(--gray-200);
}

.version-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.version-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary);
    color: var(--white);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.version-date {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.version-details {
    display: flex;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--gray-600);
}

.detail-item svg {
    width: 20px;
    height: 20px;
    color: var(--primary);
}

.download-methods-page {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.download-card {
    display: flex;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--primary);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.card-icon svg {
    width: 28px;
    height: 28px;
    color: var(--white);
}

.card-content {
    flex: 1;
}

.card-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
}

.card-content > p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

.card-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.qr-codes-grid {
    display: flex;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-lg);
}

.qr-item-large {
    text-align: center;
}

.qr-item-large img {
    width: 180px;
    height: 180px;
    padding: var(--spacing-md);
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
}

.qr-label {
    display: block;
    font-weight: 600;
    color: var(--secondary);
    margin-top: var(--spacing-sm);
}

.qr-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-500);
}

.package-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.package-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
}

.package-name {
    font-weight: 600;
    color: var(--secondary);
    min-width: 100px;
}

.package-item code {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--gray-700);
    background: var(--gray-100);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

.btn-copy {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.btn-copy svg {
    width: 18px;
    height: 18px;
    color: var(--white);
}

.btn-copy:hover {
    background: var(--primary-dark);
}

.cloud-links {
    display: flex;
    gap: var(--spacing-md);
}

.cloud-link {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    color: var(--secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.cloud-link:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
    text-decoration: none;
}

/* System Requirements */
.system-requirements {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-3xl);
    border-top: 1px solid var(--gray-200);
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.req-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
}

.req-item svg {
    width: 40px;
    height: 40px;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
}

.req-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
}

.req-item p {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* Installation Guide */
.installation-guide {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-3xl);
    border-top: 1px solid var(--gray-200);
}

.guide-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

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

.step-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    color: var(--gray-600);
}

/* Safety Notice */
.safety-notice {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--gray-50);
    border-left: 4px solid var(--warning);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-3xl);
}

.notice-icon {
    flex-shrink: 0;
}

.notice-icon svg {
    width: 32px;
    height: 32px;
    color: var(--warning);
}

.notice-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
}

.notice-content ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.notice-content li {
    position: relative;
    padding-left: var(--spacing-lg);
    color: var(--gray-600);
}

.notice-content li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 6px;
    height: 6px;
    background: var(--warning);
    border-radius: var(--radius-full);
}

/* ========================================
   Support Page
   ======================================== */
.support-section {
    padding: var(--spacing-3xl) 0;
}

.support-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-3xl);
}

/* FAQ Section */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.faq-item summary {
    list-style: none;
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary:hover {
    background: var(--gray-50);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.faq-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: var(--white);
    font-weight: 700;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.faq-question h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
}

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    padding-left: calc(var(--spacing-lg) + 32px + var(--spacing-md));
    color: var(--gray-600);
    line-height: 1.7;
}

.faq-answer ul {
    margin-top: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.faq-answer li {
    margin-bottom: var(--spacing-sm);
}

/* Sidebar */
.support-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.sidebar-card {
    padding: var(--spacing-xl);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
}

.sidebar-card h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-lg);
}

.sidebar-card h3 svg {
    width: 20px;
    height: 20px;
    color: var(--primary);
}

.quick-steps {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.quick-steps li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--gray-700);
}

.step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--primary);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.shortcut-item dt {
    display: flex;
    gap: 4px;
}

kbd {
    display: inline-block;
    padding: 2px 6px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    background: var(--gray-200);
    border-radius: var(--radius-sm);
    border-bottom: 2px solid var(--gray-300);
}

.shortcut-item dd {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.shortcut-note {
    margin-top: var(--spacing-md);
    font-size: 0.75rem;
    color: var(--gray-500);
    text-align: center;
}

.areas-brief {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.areas-brief li {
    position: relative;
    padding-left: var(--spacing-lg);
    color: var(--gray-600);
    font-size: 0.875rem;
}

.areas-brief li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: var(--radius-full);
}

.contact-card p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

.contact-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Troubleshooting */
.troubleshooting-section {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-3xl);
    border-top: 1px solid var(--gray-200);
}

.troubleshoot-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.troubleshoot-card {
    padding: var(--spacing-lg);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
}

.troubleshoot-card h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-md);
}

.trouble-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--danger);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
}

.trouble-cause,
.trouble-solution {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.trouble-cause {
    color: var(--gray-600);
}

.trouble-solution {
    color: var(--gray-700);
}

/* Tips */
.tips-section {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-3xl);
    border-top: 1px solid var(--gray-200);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.tip-card {
    padding: var(--spacing-xl);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

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

.tip-icon svg {
    width: 24px;
    height: 24px;
    color: var(--white);
}

.tip-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
}

.tip-card p {
    color: var(--gray-600);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* ========================================
   Changelog Page
   ======================================== */
.changelog-section {
    padding: var(--spacing-3xl) 0;
}

.changelog-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.version-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.version-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.version-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.version-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
}

.version-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.version-tag.current {
    background: var(--success);
    color: var(--white);
}

.version-tag.legacy {
    background: var(--gray-400);
    color: var(--white);
}

.version-date {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.version-content {
    padding: var(--spacing-xl);
}

.version-intro {
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

.changes-section {
    margin-bottom: var(--spacing-xl);
}

.changes-section:last-child {
    margin-bottom: 0;
}

.changes-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-md);
}

.changes-title svg {
    width: 18px;
    height: 18px;
}

.changes-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.changes-list li {
    position: relative;
    padding-left: var(--spacing-lg);
    color: var(--gray-700);
}

.changes-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: var(--radius-full);
}

/* Version Comparison */
.version-comparison {
    margin-bottom: var(--spacing-3xl);
}

.version-comparison .comparison-table td.highlight svg {
    width: 20px;
    height: 20px;
    color: var(--success);
}

/* Roadmap */
.roadmap-section {
    margin-bottom: var(--spacing-3xl);
}

.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.roadmap-item {
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.roadmap-badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.roadmap-badge.planned {
    background: var(--info);
    color: var(--white);
}

.roadmap-badge.consideration {
    background: var(--gray-400);
    color: var(--white);
}

.roadmap-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-xs);
}

.roadmap-item p {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* External Links */
.external-links {
    padding: var(--spacing-xl);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
}

.external-links h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-lg);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.external-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    color: var(--secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.external-link:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.external-link svg {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.external-link span {
    font-weight: 600;
    color: var(--secondary);
}

.external-link small {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-500);
    font-weight: 400;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    background: var(--secondary);
    color: var(--white);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-brand .footer-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}
.footer-brand .footer-logo img{max-width:60px;}
.footer-brand .footer-logo:hover {
    color: var(--primary-light);
    text-decoration: none;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--white);
    transition: background var(--transition-fast);
}

.footer-social a:hover {
    background: var(--primary);
}

.footer-social svg {
    width: 20px;
    height: 20px;
}

.footer-nav h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.footer-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-nav a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-nav a:hover {
    color: var(--white);
    text-decoration: none;
}

.footer-contact h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-md);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary-light);
    font-weight: 500;
}

.contact-link:hover {
    color: var(--white);
}

.contact-link svg {
    width: 16px;
    height: 16px;
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

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

/* ========================================
   Modal
   ======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    animation: modalSlideIn 0.3s ease;
}

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

.modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-200);
}

.modal-close svg {
    width: 20px;
    height: 20px;
    color: var(--gray-600);
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
    padding-right: var(--spacing-2xl);
}

.modal-version {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xl);
}

.download-methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.download-method h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-md);
}

.btn-download {
    width: 100%;
    justify-content: center;
}

.download-divider {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--gray-500);
    font-size: 0.875rem;
}

.download-divider::before,
.download-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--gray-200);
}

.download-qr {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
}

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

.qr-code {
    width: 150px;
    height: 150px;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.qr-code img {
    width: 100%;
    height: 100%;
}

.qr-label {
    font-weight: 500;
    color: var(--secondary);
}

.package-managers {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.package-managers code {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-100);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--gray-800);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary);
}

.modal-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
}

.download-note {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--gray-600);
}

.download-note svg {
    width: 18px;
    height: 18px;
    color: var(--success);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-visual {
        order: -1;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

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

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

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

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

    .support-layout {
        grid-template-columns: 1fr;
    }

    .support-sidebar {
        order: -1;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .support-sidebar .sidebar-card {
        flex: 1;
        min-width: 280px;
    }

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

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

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

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }

    .hero-title-main {
        font-size: 2.5rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .gauge-circle {
        width: 220px;
        height: 220px;
    }

    .gauge-value {
        font-size: 2.5rem;
    }

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

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

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

    .comparison-table {
        font-size: 0.875rem;
    }

    .download-card {
        flex-direction: column;
    }

    .card-icon {
        width: 50px;
        height: 50px;
    }

    .card-buttons {
        flex-direction: column;
    }

    .qr-codes-grid {
        flex-direction: column;
        align-items: center;
    }

    .cloud-links {
        flex-direction: column;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

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

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

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--gray-200);
        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-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero {
        padding: var(--spacing-2xl) 0;
    }

    .hero-title-main {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .gauge-circle {
        width: 180px;
        height: 180px;
    }

    .gauge-value {
        font-size: 2rem;
    }

    .qr-item-large img {
        width: 150px;
        height: 150px;
    }

    .support-sidebar {
        flex-direction: column;
    }

    .contact-buttons {
        flex-direction: column;
    }
}