/* {{RIPER-5:
   Action: "Added"
   Task_ID: "#2"
   Principle_Applied: "Aether-Design-Glass-Effects, Aether-Design-Universal-Softness, Aether-Design-Fluid-Animation"
   Quality_Check: "Implements full Liquid Glass design system with backdrop-filter, rounded-2xl/full consistency, and physics-based animations"
}} */

/* ========================================
   CSS Variables & Design Tokens
   ======================================== */
:root {
    /* Colors */
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-secondary: #ec4899;
    --color-accent: #06b6d4;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    
    /* Grayscale */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Glass Effect Variables */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: rgba(0, 0, 0, 0.1);
    
    /* Border Radius - Universal Softness */
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;
    
    /* Transitions - Physics-based */
    --transition-fast: cubic-bezier(0.4, 0.0, 0.2, 1) 150ms;
    --transition-base: cubic-bezier(0.4, 0.0, 0.2, 1) 300ms;
    --transition-slow: cubic-bezier(0.4, 0.0, 0.2, 1) 500ms;
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55) 400ms;
    
    /* Z-index Layers */
    --z-base: 1;
    --z-elevated: 10;
    --z-dropdown: 50;
    --z-modal: 100;
    --z-navbar: 1000;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 25%, #f093fb 50%, #4facfe 75%, #00f2fe 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    min-height: 100vh;
    overflow-x: hidden;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ========================================
   Glass Effect - Core Aether Design
   ======================================== */
.glass-effect {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%) brightness(110%);
    -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(110%);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px var(--glass-shadow);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-base);
}

.glass-effect:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-white);
}

.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - var(--spacing-xl));
    max-width: 1200px;
    z-index: var(--z-navbar);
    padding: var(--spacing-sm) var(--spacing-lg);
    animation: slideDown 0.6s var(--transition-bounce);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--color-white);
}

.logo-icon {
    font-size: var(--font-size-2xl);
}

.logo-ai {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-left: 2px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-links a {
    color: var(--color-white);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-2xl);
}

.nav-links a:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

/* ========================================
   Buttons - Universal Softness
   ======================================== */
.glass-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-2xl);
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6),
                inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-icon {
    transition: transform var(--transition-base);
}

.glass-button:hover .btn-icon {
    transform: translateX(4px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: var(--spacing-3xl);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.1;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(255, 255, 255, 0.3) 0%, transparent 50%);
}

.hero-content {
    text-align: center;
    z-index: var(--z-base);
    animation: fadeInUp 0.8s var(--transition-base);
}

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

.hero-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.6s var(--transition-base) 0.2s backwards;
}

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

.badge-text {
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
    animation: fadeInUp 0.8s var(--transition-base) 0.3s backwards;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s var(--transition-base) 0.4s backwards;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3xl);
    animation: fadeInUp 0.8s var(--transition-base) 0.5s backwards;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
    animation: fadeInUp 0.8s var(--transition-base) 0.6s backwards;
}

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

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

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

.stat-divider {
    width: 1px;
    background: rgba(255, 255, 255, 0.2);
}

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

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

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.section-subtitle {
    font-size: var(--font-size-xl);
    color: rgba(255, 255, 255, 0.8);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
}

.feature-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.feature-description {
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.7;
}

/* ========================================
   Benefits Section
   ======================================== */
.benefits {
    padding: var(--spacing-3xl) 0;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.benefit-item {
    padding: var(--spacing-xl);
    text-align: center;
}

.benefit-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.benefit-description {
    color: rgba(255, 255, 255, 0.85);
}

/* ========================================
   How It Works Section
   ======================================== */
.how-it-works {
    padding: var(--spacing-3xl) 0;
}

.steps-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.step-item {
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    transition: all var(--transition-base);
}

.step-item:hover {
    transform: translateX(8px);
}

.step-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-white);
    opacity: 0.3;
    min-width: 80px;
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.step-description {
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.7;
}

.step-connector {
    width: 2px;
    height: var(--spacing-md);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1));
    margin: 0 auto;
    margin-left: 40px;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    padding: var(--spacing-3xl) 0;
}

.cta-card {
    padding: var(--spacing-3xl);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.cta-description {
    font-size: var(--font-size-xl);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-xl);
}

.cta-form {
    display: flex;
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.cta-input {
    flex: 1;
    min-width: 250px;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-white);
    font-size: var(--font-size-base);
    outline: none;
    transition: all var(--transition-base);
}

.cta-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.cta-input:focus {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.cta-button {
    white-space: nowrap;
}

.cta-note {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-brand {
    max-width: 300px;
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--spacing-sm);
}

.footer-heading {
    color: var(--color-white);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.footer-column ul {
    list-style: none;
}

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

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

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

.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.copyright, .domain {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .navbar {
        width: calc(100% - var(--spacing-lg));
        top: var(--spacing-sm);
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .stat-divider {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-form {
        flex-direction: column;
    }
    
    .cta-input {
        min-width: 100%;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom .container {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .glass-button {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
}

/* ========================================
   Accessibility
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-2xl);
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .navbar,
    .hero-cta,
    .cta-section,
    .footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}