/* ============================================
   LangBuddy.fun - Liquid Glass + Anime Style
   ============================================ */

/* CSS Variables - Anime Color Palette */
:root {
    /* Primary Colors - Vibrant Anime Style */
    --color-primary: #FF6B9D;
    --color-primary-light: #FFB3D9;
    --color-primary-dark: #E91E63;
    
    --color-secondary: #9D50BB;
    --color-secondary-light: #CE93D8;
    
    --color-accent: #4ECDC4;
    --color-accent-light: #80DEEA;
    
    /* Gradient Backgrounds */
    --gradient-anime: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-hero: linear-gradient(135deg, #FA8BFF 0%, #2BD2FF 50%, #2BFF88 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 107, 157, 0.1) 0%, rgba(157, 80, 187, 0.1) 100%);
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    
    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius - Only Two Values! */
    --radius-soft: 24px;  /* rounded-2xl */
    --radius-full: 9999px; /* rounded-full */
    
    /* Transitions */
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: #0a0a1f;
    color: #ffffff;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Animated Background */
.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #0a0a1f 0%, #1a0a2e 50%, #16213e 100%);
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: var(--radius-full);
    filter: blur(100px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.blob-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #FF6B9D, transparent);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.blob-2 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, #9D50BB, transparent);
    top: 40%;
    right: -15%;
    animation-delay: 7s;
}

.blob-3 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, #4ECDC4, transparent);
    bottom: -10%;
    left: 30%;
    animation-delay: 14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(100px, -100px) scale(1.1); }
    66% { transform: translate(-100px, 100px) scale(0.9); }
}

/* Stars Background */
.stars {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, rgba(255, 255, 255, 0.3), transparent),
        radial-gradient(2px 2px at 60px 70px, rgba(255, 255, 255, 0.2), transparent),
        radial-gradient(1px 1px at 50px 50px, rgba(255, 255, 255, 0.4), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255, 255, 255, 0.3), transparent),
        radial-gradient(2px 2px at 90px 10px, rgba(255, 255, 255, 0.25), transparent);
    background-size: 200px 200px;
    animation: twinkle 5s infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

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

/* Navigation - Liquid Glass */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    backdrop-filter: blur(20px) saturate(180%);
    background: rgba(10, 10, 31, 0.7);
    border-bottom: 1px solid var(--glass-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 800;
}

.logo-icon {
    font-size: 2rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.logo-text {
    background: linear-gradient(135deg, #FF6B9D, #9D50BB);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-fun {
    color: var(--color-accent);
}

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

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s var(--transition-smooth);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-hero);
    transition: width 0.3s var(--transition-smooth);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: var(--radius-full);
    transition: all 0.3s var(--transition-smooth);
}

/* Buttons - Liquid Glass Style */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius-soft);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-hero);
    color: white;
    box-shadow: 0 8px 24px rgba(250, 139, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(250, 139, 255, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-3px);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-primary);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.1rem;
}

.btn-icon {
    font-size: 1.2em;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    position: relative;
}

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

.hero-content {
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    animation: float-badge 3s infinite ease-in-out;
}

@keyframes float-badge {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.badge-icon {
    animation: spin-slow 8s linear infinite;
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

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

.hero-subtitle {
    font-size: 1.2rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-md);
}

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

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* Hero Visual - Phone Mockup */
.hero-visual {
    position: relative;
    z-index: 1;
}

.phone-mockup {
    position: relative;
    animation: float-phone 6s infinite ease-in-out;
}

@keyframes float-phone {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(-2deg); }
}

.phone-frame {
    width: 320px;
    height: 640px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    backdrop-filter: blur(20px);
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-soft);
    padding: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin: 0 auto;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    border-radius: var(--radius-soft);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    overflow: hidden;
}

.chat-bubble {
    padding: 12px 18px;
    border-radius: var(--radius-soft);
    max-width: 80%;
    animation: slide-in 0.5s var(--transition-bounce);
}

@keyframes slide-in {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.chat-user {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    align-self: flex-end;
    box-shadow: 0 4px 12px rgba(255, 107, 157, 0.3);
}

.chat-ai {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    align-self: flex-start;
}

.floating-icon {
    position: absolute;
    font-size: 3rem;
    animation: float-icon 4s infinite ease-in-out;
}

.icon-1 {
    top: 10%;
    right: -10%;
    animation-delay: 0s;
}

.icon-2 {
    top: 50%;
    left: -15%;
    animation-delay: 1.3s;
}

.icon-3 {
    bottom: 15%;
    right: -5%;
    animation-delay: 2.6s;
}

@keyframes float-icon {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(10deg); }
}

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

.section-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-soft);
    padding: var(--spacing-lg);
    transition: all 0.4s var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-card);
    opacity: 0;
    transition: opacity 0.4s var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 20px 40px rgba(250, 139, 255, 0.2);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card > * {
    position: relative;
    z-index: 1;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: inline-block;
    animation: bounce-icon 2s infinite;
}

@keyframes bounce-icon {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.feature-tag {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
}

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

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.step-card {
    flex: 1;
    min-width: 250px;
    max-width: 300px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-soft);
    padding: var(--spacing-lg);
    position: relative;
    transition: all 0.4s var(--transition-smooth);
}

.step-card:hover {
    transform: scale(1.05);
    border-color: var(--color-primary);
    box-shadow: 0 16px 32px rgba(255, 107, 157, 0.3);
}

.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 50px;
    background: var(--gradient-hero);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    box-shadow: 0 4px 12px rgba(250, 139, 255, 0.4);
}

.step-content {
    text-align: center;
    margin-top: var(--spacing-md);
}

.step-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.step-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.step-arrow {
    font-size: 2rem;
    color: var(--color-primary);
    animation: arrow-pulse 2s infinite;
}

@keyframes arrow-pulse {
    0%, 100% { transform: translateX(0); opacity: 1; }
    50% { transform: translateX(10px); opacity: 0.5; }
}

/* Languages Section */
.languages {
    padding: var(--spacing-xl) 0;
}

.languages-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.language-badge {
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    font-weight: 600;
    transition: all 0.3s var(--transition-smooth);
    cursor: pointer;
}

.language-badge:hover {
    background: var(--gradient-hero);
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 8px 20px rgba(250, 139, 255, 0.3);
}

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

.cta-content {
    text-align: center;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(30px) saturate(180%);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-soft);
    padding: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
    box-shadow: 0 20px 60px rgba(250, 139, 255, 0.2);
}

.cta-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    animation: bounce 2s infinite;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

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

.cta-note {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.cta-note span:first-child {
    color: var(--color-accent);
}

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

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--spacing-sm);
}

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

.social-link {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s var(--transition-smooth);
}

.social-link:hover {
    background: var(--gradient-hero);
    transform: translateY(-3px);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-heading {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.footer-link {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: color 0.3s var(--transition-smooth);
}

.footer-link:hover {
    color: var(--color-primary);
    padding-left: 5px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

.legal-link {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.3s var(--transition-smooth);
}

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

/* Responsive Design */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-visual {
        margin-top: var(--spacing-lg);
    }
    
    .phone-frame {
        width: 280px;
        height: 560px;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
    }
}