/**
 * Modern Design System for Teto-Egen Personality Test
 * Phase 1: CSS Variables & Foundation
 */

/* ==========================================
   🎨 MODERN COLOR PALETTE & GRADIENTS
   ========================================== */

:root {
    /* === Primary Brand Colors === */
    --brand-primary: #667eea;
    --brand-secondary: #764ba2;
    --brand-accent: #f093fb;
    
    /* === Background System === */
    --bg-dark: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    
    /* === Glassmorphism Colors === */
    --glass-bg-light: rgba(255, 255, 255, 0.15);
    --glass-bg-dark: rgba(255, 255, 255, 0.05);
    --glass-border-light: rgba(255, 255, 255, 0.2);
    --glass-border-dark: rgba(255, 255, 255, 0.1);
    --glass-shadow: rgba(31, 38, 135, 0.37);
    
    /* === Modern Gradients === */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    
    /* === Personality Type Modern Gradients === */
    --teto-male-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --teto-female-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --egen-male-gradient: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    --egen-female-gradient: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
    
    /* === Text Colors === */
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --text-white: #ffffff;
    --text-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* === Spacing System === */
    --space-xs: 0.25rem;    /* 4px */
    --space-sm: 0.5rem;     /* 8px */
    --space-md: 1rem;       /* 16px */
    --space-lg: 1.5rem;     /* 24px */
    --space-xl: 2rem;       /* 32px */
    --space-2xl: 3rem;      /* 48px */
    --space-3xl: 4rem;      /* 64px */
    
    /* === Border Radius System === */
    --radius-sm: 0.375rem;  /* 6px */
    --radius-md: 0.5rem;    /* 8px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-xl: 1rem;      /* 16px */
    --radius-2xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;
    
    /* === Shadow System === */
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glass: 0 8px 32px rgba(31, 38, 135, 0.37);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.4);
    
    /* === Animation System === */
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* === Typography Scale === */
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */
    --font-size-5xl: 3rem;      /* 48px */
    --font-size-6xl: 3.75rem;   /* 60px */
    
    /* === Z-index System === */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ==========================================
   🌟 GLASSMORPHISM FOUNDATION
   ========================================== */

.glass {
    background: var(--glass-bg-light);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border-light);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-glass);
}

.glass-dark {
    background: var(--glass-bg-dark);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border-dark);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-glass);
}

.glass-card {
    background: var(--glass-bg-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: var(--transition-normal);
}

.glass-card:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--glass-border-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ==========================================
   🎨 GRADIENT UTILITIES
   ========================================== */

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

.gradient-bg-primary {
    background: var(--gradient-primary);
}

.gradient-bg-secondary {
    background: var(--gradient-secondary);
}

.gradient-bg-hero {
    background: var(--gradient-hero);
}

.gradient-border {
    border: 2px solid transparent;
    background: linear-gradient(var(--bg-white), var(--bg-white)) padding-box,
                var(--gradient-primary) border-box;
}

/* ==========================================
   🚀 MODERN BUTTON SYSTEM
   ========================================== */

.btn-modern {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-decoration: none;
    transition: var(--transition-normal);
    cursor: pointer;
    overflow: hidden;
}

.btn-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.3) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.btn-modern:hover::before {
    transform: translateX(100%);
}

.btn-primary-modern {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: var(--shadow-lg);
}

.btn-primary-modern:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-glass {
    background: var(--glass-bg-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border-light);
    color: var(--text-primary);
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

/* ==========================================
   📱 RESPONSIVE UTILITIES
   ========================================== */

@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;  /* Mobile: 40px */
        --font-size-5xl: 2rem;    /* Mobile: 32px */
        --font-size-4xl: 1.75rem; /* Mobile: 28px */
    }
    
    .glass-card {
        padding: var(--space-md);
    }
}

/* ==========================================
   ✨ ANIMATION UTILITIES
   ========================================== */

.animate-fade-in {
    opacity: 0;
    animation: fadeIn 0.6s ease-out forwards;
}

.animate-slide-up {
    opacity: 0;
    transform: translateY(30px);
    animation: slideUp 0.6s ease-out forwards;
}

.animate-scale-in {
    opacity: 0;
    transform: scale(0.95);
    animation: scaleIn 0.5s ease-out forwards;
}

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

@keyframes slideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Animation delays for staggered effects */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }

/* ==========================================
   🌟 HERO SECTION MODERN DESIGN
   ========================================== */

/* Hero Background & Floating Shapes */
.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    overflow: hidden;
    z-index: -1;
}

.floating-shapes {
    position: relative;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 120px;
    height: 120px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 80px;
    height: 80px;
    top: 20%;
    right: 15%;
    animation-delay: 2s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    bottom: 30%;
    left: 20%;
    animation-delay: 4s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    bottom: 20%;
    right: 10%;
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
        opacity: 0.7;
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
        opacity: 1;
    }
}

/* Hero Container */
.hero-container {
    position: relative;
    z-index: 2;
    padding-top: var(--space-3xl);
    padding-bottom: var(--space-3xl);
}

/* Modern Hero Title */
.hero-title {
    font-size: clamp(1.2rem, 4vw, 2.25rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-xl);
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    position: relative;
    white-space: normal; /* allow wrapping */
    text-align: center;  /* center alignment */
}

.hero-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: var(--gradient-secondary);
    border-radius: 2px;
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 5px rgba(240, 147, 251, 0.5);
    }
    50% {
        box-shadow: 0 0 20px rgba(240, 147, 251, 0.8);
    }
}

/* Identity Questions Modern */
.identity-questions-modern {
    margin: var(--space-xl) auto var(--space-2xl);
    max-width: 600px;
    position: relative;
    overflow: hidden;
    background: transparent !important;
    backdrop-filter: none !important;
    border: none !important;
}

.question-heading-modern {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    opacity: 0.9;
}

/* Typing Container Modern */
.typing-container-modern {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60px;
    font-size: var(--font-size-xl);
    font-weight: 500;
    color: var(--brand-primary);
    position: relative;
    background: transparent;
    padding: 0;
}

.modern-typing {
    font-size: var(--font-size-xl);
    font-weight: 500;
    color: var(--brand-primary);
    white-space: normal;
    text-align: center;
}

.typing-cursor {
    display: inline-block;
    width: 3px;
    height: 1.2em;
    background: var(--brand-primary);
    margin-left: 2px;
    animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Main Image Modern */
.main-image-modern {
    margin: var(--space-2xl) auto;
    max-width: 500px;
    position: relative;
}

.image-wrapper {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    transform-style: preserve-3d;
    transition: var(--transition-slow);
}

.image-wrapper:hover {
    transform: perspective(1000px) rotateY(5deg) rotateX(5deg) scale(1.02);
}

.hero-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    transition: var(--transition-slow);
    position: relative;
    z-index: 2;
}

.image-glow {
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background: var(--gradient-primary);
    border-radius: var(--radius-2xl);
    filter: blur(30px);
    opacity: 0.3;
    z-index: 1;
    transition: var(--transition-slow);
}

.image-wrapper:hover .image-glow {
    opacity: 0.5;
    filter: blur(40px);
}

/* Hero CTA Button */
.btn-hero {
    font-size: var(--font-size-lg);
    padding: var(--space-lg) var(--space-2xl);
    margin: var(--space-2xl) auto;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: translateZ(0);
    border-radius: var(--radius-xl);
}

.btn-hero:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-2xl);
}

.btn-shine {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.btn-hero:hover .btn-shine {
    left: 100%;
}

/* Responsive Hero Design */
@media (max-width: 768px) {
    .hero-container {
        padding-top: var(--space-2xl);
        padding-bottom: var(--space-2xl);
    }
    
    .hero-title {
        margin-bottom: var(--space-lg);
    }
    
    .identity-questions-modern {
        margin: var(--space-lg) auto var(--space-xl);
        padding: var(--space-md);
    }
    
    .question-heading-modern {
        font-size: var(--font-size-xl);
    }
    
    .modern-typing {
        font-size: var(--font-size-lg);
    }
    
    .main-image-modern {
        margin: var(--space-xl) auto;
        max-width: 400px;
    }
    
    .btn-hero {
        font-size: var(--font-size-base);
        padding: var(--space-md) var(--space-xl);
    }
    
    .shape {
        opacity: 0.5;
    }
    
         .shape-1 { width: 80px; height: 80px; }
     .shape-2 { width: 60px; height: 60px; }
     .shape-3 { width: 40px; height: 40px; }
     .shape-4 { width: 70px; height: 70px; }
 }

/* ==========================================
   🎴 MODERN PERSONALITY CARDS
   ========================================== */

.personality-types-modern {
    margin: var(--space-3xl) 0;
    perspective: 1000px;
}

.modern-personality-card {
    position: relative;
    height: 280px;
    border-radius: var(--radius-2xl);
    cursor: pointer;
    transform-style: preserve-3d;
    transition: var(--transition-slow);
    overflow: hidden;
}

.modern-personality-card:hover {
    transform: translateY(-10px) rotateY(5deg) rotateX(5deg) scale(1.02);
}

/* Card Background Gradients */
.card-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--radius-2xl);
    opacity: 0.9;
    transition: var(--transition-normal);
}

.teto-male-modern .card-background {
    background: var(--teto-male-gradient);
}

.teto-female-modern .card-background {
    background: var(--teto-female-gradient);
}

.egen-male-modern .card-background {
    background: var(--egen-male-gradient);
}

.egen-female-modern .card-background {
    background: var(--egen-female-gradient);
}

.modern-personality-card:hover .card-background {
    opacity: 1;
    transform: scale(1.05);
}

/* Card Content */
.card-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--space-lg);
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-2xl);
    text-align: center;
    transition: var(--transition-normal);
}

.modern-personality-card:hover .card-content {
    background: rgba(255, 255, 255, 0.35);
    border-color: rgba(255, 255, 255, 0.5);
}

/* Icon Container Modern */
.icon-container-modern {
    position: relative;
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
    color: var(--text-white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
    transition: var(--transition-normal);
}

.icon-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    filter: blur(20px);
    opacity: 0;
    transition: var(--transition-normal);
}

.modern-personality-card:hover .icon-glow {
    opacity: 0.7;
    transform: translate(-50%, -50%) scale(1.5);
}

.modern-personality-card:hover .icon-container-modern {
    transform: scale(1.1);
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.5));
}

/* Card Title Modern */
.card-title-modern {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: var(--space-sm);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
}

.card-description {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--space-md);
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

/* Trait Badges */
.card-traits {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

.trait-badge {
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-white);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
    transition: var(--transition-normal);
}

.modern-personality-card:hover .trait-badge {
    background: rgba(255, 255, 255, 0.4);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

/* Card Hover Content - Overlay Style */
.card-hover-content {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    opacity: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: var(--radius-2xl);
    transition: var(--transition-normal);
    color: var(--text-white);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
    z-index: 10;
    cursor: pointer;
}

.modern-personality-card:hover .card-hover-content {
    opacity: 1;
}

.card-hover-content i {
    transition: var(--transition-normal);
}

.modern-personality-card:hover .card-hover-content i {
    transform: translateX(5px);
}

/* Card Shine Effect */
.card-shine {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 70%
    );
    transform: translateX(-100%) rotate(45deg);
    transition: transform 0.8s;
    pointer-events: none;
}

.modern-personality-card:hover .card-shine {
    transform: translateX(100%) rotate(45deg);
}

/* Card Active State */
.modern-personality-card:active {
    transform: translateY(-8px) rotateY(3deg) rotateX(3deg) scale(0.98);
}

/* Card Click Animation */
.modern-personality-card.card-clicked {
    animation: cardPulse 0.3s ease-out;
}

@keyframes cardPulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.95);
        box-shadow: var(--shadow-2xl);
    }
    100% {
        transform: scale(1);
    }
}

/* Staggered Animation for Cards */
.modern-personality-card:nth-child(1) { animation-delay: 0.1s; }
.modern-personality-card:nth-child(2) { animation-delay: 0.2s; }
.modern-personality-card:nth-child(3) { animation-delay: 0.3s; }
.modern-personality-card:nth-child(4) { animation-delay: 0.4s; }

/* Mobile Responsive Cards */
@media (max-width: 768px) {
    .modern-personality-card {
        height: 260px;
        margin-bottom: var(--space-lg);
    }
    
    .modern-personality-card:hover {
        transform: translateY(-5px) scale(1.02);
    }
    
    .card-content {
        padding: var(--space-md);
        justify-content: space-evenly;
        gap: var(--space-sm);
    }
    
    .icon-container-modern {
        font-size: 2rem;
        margin-bottom: var(--space-xs);
    }
    
    .card-title-modern {
        font-size: var(--font-size-lg);
        margin-bottom: var(--space-xs);
    }
    
    .card-description {
        font-size: var(--font-size-xs);
        margin-bottom: var(--space-sm);
        flex-grow: 1;
        display: flex;
        align-items: center;
    }
    
    .card-traits {
        margin-bottom: 0;
    }
    
    .trait-badge {
        font-size: 0.65rem;
        padding: 2px var(--space-xs);
    }
    
    .card-hover-content {
        font-size: var(--font-size-sm);
    }
}

@media (max-width: 576px) {
    .personality-types-modern .col-6 {
        flex: 0 0 100%;
        max-width: 100%;
        margin-bottom: var(--space-md);
    }
    
    .modern-personality-card {
        height: 220px;
        max-width: 320px;
        margin: 0 auto var(--space-md);
    }
    
    .card-content {
        padding: var(--space-md);
        justify-content: space-between;
        gap: var(--space-xs);
    }
    
    .icon-container-modern {
        font-size: 1.8rem;
        margin-bottom: var(--space-xs);
    }
    
    .card-title-modern {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-xs);
    }
    
    .card-description {
        font-size: var(--font-size-xs);
        line-height: 1.3;
        flex-grow: 0;
    }
    
    .card-hover-content {
        font-size: var(--font-size-xs);
    }
}

/* ==========================================
   🎭 ADVANCED ANIMATIONS & INTERACTIONS
   ========================================== */

/* IntersectionObserver 애니메이션 */
.animate-in {
    animation: slideInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideInUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 리플 효과 */
.ripple-effect {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    pointer-events: none;
    animation: ripple 0.6s ease-out;
    z-index: 10;
}

@keyframes ripple {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    100% {
        transform: scale(2);
        opacity: 0;
    }
}

/* 아이콘 바운스 애니메이션 */
@keyframes iconBounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) scale(1);
    }
    40% {
        transform: translateY(-8px) scale(1.1);
    }
    60% {
        transform: translateY(-4px) scale(1.05);
    }
}

/* 카드 펄스 애니메이션 */
.card-pulse {
    animation: cardPulse 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes cardPulse {
    0% {
        transform: scale(1);
        box-shadow: var(--shadow-lg);
    }
    50% {
        transform: scale(1.03);
        box-shadow: var(--shadow-2xl);
    }
    100% {
        transform: scale(1);
        box-shadow: var(--shadow-lg);
    }
}

/* 마우스 팔로우 효과를 위한 CSS 변수 */
.btn-modern,
.btn-hero {
    --mouse-x: 50%;
    --mouse-y: 50%;
    position: relative;
    overflow: hidden;
}

.btn-modern::after,
.btn-hero::after {
    content: '';
    position: absolute;
    top: var(--mouse-y);
    left: var(--mouse-x);
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
    pointer-events: none;
}

.btn-modern:hover::after,
.btn-hero:hover::after {
    width: 100px;
    height: 100px;
}

/* 스크롤 기반 패럴랙스 효과 */
.parallax-element {
    will-change: transform;
}

/* 부드러운 전환을 위한 클래스 */
.smooth-transition {
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* 스크롤 애니메이션을 위한 초기 상태 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* 고급 호버 효과 */
.advanced-hover {
    position: relative;
    transition: var(--transition-normal);
}

.advanced-hover::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.advanced-hover:hover::before {
    opacity: 1;
}

/* 스태거드 애니메이션 */
.stagger-animation {
    animation-fill-mode: both;
}

.stagger-animation:nth-child(1) { animation-delay: 0.1s; }
.stagger-animation:nth-child(2) { animation-delay: 0.2s; }
.stagger-animation:nth-child(3) { animation-delay: 0.3s; }
.stagger-animation:nth-child(4) { animation-delay: 0.4s; }
.stagger-animation:nth-child(5) { animation-delay: 0.5s; }

/* 로딩 상태 애니메이션 */
.loading-shimmer {
    background: linear-gradient(90deg, 
        transparent 25%, 
        rgba(255,255,255,0.1) 50%, 
        transparent 75%
    );
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* 부드러운 등장 애니메이션 */
.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

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

/* 스케일 애니메이션 */
.scale-in {
    opacity: 0;
    transform: scale(0.9);
    animation: scaleIn 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes scaleIn {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 회전 애니메이션 */
.rotate-in {
    opacity: 0;
    transform: rotate(-10deg) scale(0.9);
    animation: rotateIn 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes rotateIn {
    to {
        opacity: 1;
        transform: rotate(0deg) scale(1);
    }
}

/* GPU 가속을 위한 최적화 */
.gpu-accelerated {
    transform: translateZ(0);
    will-change: transform;
}

/* 성능 최적화를 위한 contain 속성 */
.animation-container {
    contain: layout style paint;
} 

.hero-title,
.modern-typing {
    font-family: "Noto Sans", "Noto Sans KR", "Noto Sans JP", "Noto Sans Bengali", "Helvetica", "Arial", sans-serif;
}