/* Design System Variables - Based on DSColorScheme and DSSpacing */
:root {
    /* Colors - Light Theme (default) */
    --color-background: #F5F5F7;
    --color-card-background: #FFFFFF;
    --color-card-background-secondary: #F9F9FB;
    --color-text-primary: #000000;
    --color-text-secondary: #6E6E73;
    --color-text-tertiary: #8E8E93;
    --color-brand-primary: #B794F6;
    --color-brand-details: #BD98F8;
    --color-stroke-light: rgba(0, 0, 0, 0.05);
    --color-stroke: rgba(0, 0, 0, 0.1);
    --color-shadow: rgba(0, 0, 0, 0.15);
    --color-shadow-light: rgba(0, 0, 0, 0.05);
    
    /* Spacing - Based on DSSpacing */
    --spacing-xxs: 4px;
    --spacing-xs: 8px;
    --spacing-s: 12px;
    --spacing-m: 16px;
    --spacing-l: 20px;
    --spacing-xl: 24px;
    --spacing-xxl: 32px;
    --spacing-xxxl: 48px;
    
    /* Border Radius - Based on DSRadius */
    --radius-pill: 38px;
    --radius-card: 14px;
    --radius-button: 12px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-accent: 34px;
    --font-size-title: 22px;
    --font-size-card-title: 20px;
    --font-size-body: 18px;
    --font-size-description: 16px;
    --font-weight-semibold: 600;
    --font-weight-medium: 500;
    --font-weight-regular: 400;
    
    /* Button */
    --button-height: 56px;
    --button-padding-horizontal: 32px;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.3, 0.7, 0.7);
    --transition-normal: 0.3s cubic-bezier(0.3, 0.7, 0.7);
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #0F0E14;
        --color-card-background: #1E1E28;
        --color-card-background-secondary: #2C2A36;
        --color-text-primary: #FFFFFF;
        --color-text-secondary: #8688A0;
        --color-text-tertiary: #A9AAB4;
        --color-stroke-light: rgba(255, 255, 255, 0.05);
        --color-stroke: rgba(255, 255, 255, 0.08);
        --color-shadow: rgba(0, 0, 0, 0.3);
        --color-shadow-light: rgba(0, 0, 0, 0.2);
    }
}

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

html {
    scroll-behavior: smooth;
}

/* Remove default link styles */
a {
    color: inherit;
    text-decoration: none;
}

a:visited {
    color: inherit;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding-top: 64px; /* Space for fixed navbar */
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-stroke-light);
    z-index: 1000;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-m) var(--spacing-m);
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    font-size: 20px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
}

.menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
    transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

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

.nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-card-background);
    border-bottom: 1px solid var(--color-stroke-light);
    box-shadow: 0 4px 12px var(--color-shadow-light);
    display: none;
    flex-direction: column;
    padding: var(--spacing-m);
    gap: var(--spacing-s);
    transform: translateY(-100%);
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

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

.nav-link {
    font-size: 16px;
    color: var(--color-text-primary);
    text-decoration: none;
    padding: var(--spacing-s) var(--spacing-m);
    border-radius: var(--radius-button);
    transition: background-color var(--transition-fast);
}

.nav-link:hover {
    background-color: var(--color-card-background-secondary);
}

@media (min-width: 768px) {
    body {
        padding-top: 0;
    }
    
    .navbar {
        position: relative;
    }
    
    .menu-toggle {
        display: none;
    }
    
    .nav-menu {
        position: static;
        display: flex;
        flex-direction: row;
        background-color: transparent;
        border: none;
        box-shadow: none;
        padding: 0;
        transform: none;
        opacity: 1;
        gap: var(--spacing-m);
    }
    
    .nav-link {
        padding: var(--spacing-xs) var(--spacing-m);
    }
    
    .hero-section {
        min-height: 100vh;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-m);
}

/* Hero Section */
.hero-section {
    min-height: calc(100vh - 64px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) var(--spacing-m);
    background-color: var(--color-background);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-m);
    width: 100%;
}

.hero-title {
    font-size: 28px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-m);
    line-height: 1.2;
    animation: fadeInUp 0.6s ease-out;
}

.hero-subtitle {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

/* Features Section */
.features-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-background);
}

/* Tabs */
.tabs-container {
    display: flex;
    justify-content: center;
    gap: var(--spacing-s);
    margin-bottom: var(--spacing-xl);
    padding: 0 var(--spacing-m);
    flex-wrap: wrap;
}

.tab-button {
    padding: var(--spacing-s) var(--spacing-l);
    font-size: 16px;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background-color: transparent;
    border: 1px solid var(--color-stroke-light);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-family);
    position: relative;
    -webkit-tap-highlight-color: transparent;
}

.tab-button:hover {
    color: var(--color-text-primary);
    border-color: var(--color-stroke);
}

.tab-button.active {
    color: var(--color-text-primary);
    background-color: var(--color-card-background);
    border-color: var(--color-stroke);
    box-shadow: 0 2px 8px var(--color-shadow-light);
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-l);
    padding: 0 var(--spacing-m);
}

/* Feature Card */
.feature-card {
    background-color: var(--color-card-background);
    border-radius: var(--radius-card);
    padding: var(--spacing-l);
    border: 1px solid var(--color-stroke-light);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease-out forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }
.feature-card:nth-child(7) { animation-delay: 0.7s; }
.feature-card:nth-child(8) { animation-delay: 0.8s; }
.feature-card:nth-child(9) { animation-delay: 0.9s; }

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
    border-color: var(--color-stroke);
}

.feature-image {
    width: 100%;
    margin-bottom: var(--spacing-l);
    border-radius: var(--radius-button);
    overflow: hidden;
    background-color: var(--color-card-background-secondary);
}

.feature-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
}

.feature-content {
    flex: 1;
}

.feature-title {
    font-size: 18px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-s);
    line-height: 1.3;
}

.feature-description {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Buttons */
.btn-primary {
    display: inline-block;
    padding: 0 var(--spacing-xl);
    height: 52px;
    line-height: 52px;
    font-size: 17px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    text-decoration: none;
    text-align: center;
    background-color: var(--color-card-background);
    border: 1px solid var(--color-stroke-light);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--transition-normal);
    animation: fadeInUp 0.6s ease-out 0.4s both;
    min-width: 200px;
    -webkit-tap-highlight-color: transparent;
    -webkit-appearance: none;
    appearance: none;
}

.btn-primary:hover {
    transform: scale(0.97);
    opacity: 0.9;
    box-shadow: 0 4px 12px var(--color-shadow-light);
}

.btn-primary:active {
    transform: scale(0.95);
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-background);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-l) var(--spacing-m);
}

.cta-title {
    font-size: 20px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-s);
    line-height: 1.3;
}

.cta-subtitle {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
}

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

/* Footer */
.footer {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-background);
    border-top: 1px solid var(--color-stroke-light);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-m);
    text-align: center;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-s);
}

.footer-link {
    font-size: 14px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-text-primary);
}

.footer-separator {
    font-size: 14px;
    color: var(--color-text-tertiary);
    margin: 0 var(--spacing-xs);
}

.footer-text {
    font-size: 14px;
    color: var(--color-text-tertiary);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Responsive Design */
@media (min-width: 640px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
    
    .feature-card {
        padding: var(--spacing-xl);
    }
    
    .hero-section {
        min-height: calc(100vh - 64px);
        padding: var(--spacing-xxl) 0;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .feature-title {
        font-size: var(--font-size-card-title);
    }
    
    .feature-description {
        font-size: var(--font-size-description);
    }
    
    .cta-title {
        font-size: var(--font-size-title);
    }
    
    .cta-subtitle {
        font-size: var(--font-size-body);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-xxl);
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xxl);
    }
    
    .features-section {
        padding: var(--spacing-xxxl) 0;
    }
    
    .hero-content {
        padding: var(--spacing-xxl) var(--spacing-m);
    }
    
    .hero-section {
        min-height: 100vh;
        padding: var(--spacing-xxl) 0;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .tabs-container {
        margin-bottom: var(--spacing-xxxl);
    }
    
    .cta-section {
        padding: var(--spacing-xxxl) 0;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .feature-card {
        opacity: 1;
        transform: none;
    }
}

/* Print Styles */
@media print {
    .btn-primary,
    .cta-section,
    .footer,
    .tabs-container {
        display: none;
    }
    
    .tab-content {
        display: block !important;
    }
}