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

:root {
    /* Color Palette - Inspired by AirLink */
    --primary-purple: #6366F1;
    --primary-purple-dark: #4F46E5;
    --secondary-purple: #8B5CF6;
    --accent-blue: #3B82F6;
    --accent-indigo: #6366F1;
    
    /* Neutral Colors */
    --bg-primary: #F8F9FB;
    --bg-secondary: #FFFFFF;
    --bg-card: #FFFFFF;
    --bg-hover: #F3F4F6;
    --bg-active: #EEF2FF;
    
    /* Text Colors */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --text-white: #FFFFFF;
    
    /* Border & Shadow */
    --border-color: #E5E7EB;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Permission Icon Colors */
    --color-location: #F59E0B;
    --color-notification: #8B5CF6;
    --color-storage: #3B82F6;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header Styles */
.header {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-lg);
}

.app-icon {
    display: inline-flex;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 4px 12px rgba(99, 102, 241, 0.3));
    transition: transform 0.3s ease;
}

.app-icon:hover {
    transform: translateY(-4px) scale(1.05);
}

.app-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--primary-purple), var(--secondary-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.developer {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--bg-card);
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    overflow-x: auto;
    scrollbar-width: none;
}

.nav-menu::-webkit-scrollbar {
    display: none;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    white-space: nowrap;
    transition: all 0.3s ease;
    position: relative;
}

.nav-item svg {
    width: 20px;
    height: 20px;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item:hover svg {
    opacity: 1;
}

.nav-item.active {
    background: var(--bg-active);
    color: var(--primary-purple);
}

.nav-item.active svg {
    opacity: 1;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.section {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

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

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

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.section-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.section-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 1rem;
}

/* Card Styles */
.card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

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

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

.card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.card p:last-child {
    margin-bottom: 0;
}

.last-updated {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-style: italic;
    margin-bottom: var(--spacing-md);
}

/* Highlight Card */
.highlight-card {
    background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
    border: 2px solid var(--primary-purple);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.highlight-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.highlight-card h3 {
    color: var(--primary-purple);
    margin-bottom: var(--spacing-xs);
}

.highlight-card p {
    color: var(--text-primary);
}

/* Info Card */
.info-card {
    background: linear-gradient(135deg, #F0FDF4 0%, #DCFCE7 100%);
    border: 2px solid #10B981;
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.info-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.info-card h3 {
    color: #059669;
    margin-bottom: var(--spacing-xs);
}

.info-card p {
    color: var(--text-primary);
}

/* Permission Grid */
.permission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.permission-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.permission-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-purple), var(--secondary-purple));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.permission-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-purple);
}

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

.permission-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    transition: transform 0.3s ease;
}

.permission-card:hover .permission-icon {
    transform: scale(1.1) rotate(5deg);
}

.permission-icon.location {
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
    color: var(--color-location);
}

.permission-icon.notification {
    background: linear-gradient(135deg, #EDE9FE, #DDD6FE);
    color: var(--color-notification);
}

.permission-icon.storage {
    background: linear-gradient(135deg, #DBEAFE, #BFDBFE);
    color: var(--color-storage);
}

.permission-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.permission-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-purple);
    background: var(--bg-active);
    padding: 4px 12px;
    border-radius: 12px;
    margin-bottom: var(--spacing-sm);
}

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

/* Feature List */
.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.feature-list li {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.check-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--primary-purple), var(--secondary-purple));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    margin-top: 2px;
}

.feature-list strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

/* Ad Info Grid */
.ad-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.ad-info-item {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--primary-purple);
}

.ad-info-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.ad-info-item ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.ad-info-item li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-left: var(--spacing-md);
    position: relative;
}

.ad-info-item li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-purple);
    font-weight: 700;
}

/* Link List */
.link-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.link-list li {
    padding-left: var(--spacing-md);
    position: relative;
}

.link-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-purple);
    font-weight: 700;
}

.link-list a {
    color: var(--primary-purple);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.link-list a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-purple);
    transition: width 0.3s ease;
}

.link-list a:hover {
    color: var(--primary-purple-dark);
}

.link-list a:hover::after {
    width: 100%;
}

/* Contact Info */
.contact-info {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-md);
    border-left: 4px solid var(--primary-purple);
}

.contact-info p {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.contact-info p:last-child {
    margin-bottom: 0;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
    border-top: 2px solid var(--border-color);
    color: var(--text-secondary);
}

.footer p {
    margin-bottom: var(--spacing-xs);
}

.footer-version {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .app-title {
        font-size: 2rem;
    }
    
    .nav-menu {
        gap: var(--spacing-xs);
        padding: 6px;
    }
    
    .nav-item {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85rem;
    }
    
    .nav-item svg {
        width: 18px;
        height: 18px;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .permission-grid {
        grid-template-columns: 1fr;
    }
    
    .ad-info-grid {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .app-title {
        font-size: 1.75rem;
    }
    
    .nav-item span:not(.check-icon) {
        display: none;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection Styles */
::selection {
    background: var(--primary-purple);
    color: white;
}

::-moz-selection {
    background: var(--primary-purple);
    color: white;
}