/* ==========================================================================
   EineCosmetics Modern Design System
   Version: 2.0
   ========================================================================== */

/* ==========================================================================
   1. CSS Variables & Design Tokens
   ========================================================================== */
:root {
    /* Primary Colors */
    --primary-color: #EF695A;
    --primary-dark: #D54A3B;
    --primary-light: #FFE8E5;
    --primary-gradient: linear-gradient(135deg, #EF695A 0%, #D54A3B 100%);
    
    /* Secondary Colors */
    --secondary-color: #2C5282;
    --secondary-light: #E6F3FF;
    --secondary-dark: #1A365D;
    
    /* Neutral Colors */
    --text-primary: #1A202C;
    --text-secondary: #4A5568;
    --text-muted: #718096;
    --border-color: #E2E8F0;
    --bg-gray: #F7FAFC;
    --bg-white: #FFFFFF;
    --bg-dark: #2D3748;
    
    /* Accent Colors */
    --success: #48BB78;
    --warning: #F6AD55;
    --info: #4299E1;
    --danger: #FC8181;
    
    /* Typography */
    --font-primary: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Noto Serif JP', 'Georgia', serif;
    --font-numeric: 'Roboto', 'Arial', sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 4rem;
    
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;
    --leading-loose: 2;
    
    /* Spacing (8px grid) */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 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-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ==========================================================================
   2. Global Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography Base */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: var(--leading-tight);
    margin: 0 0 var(--space-4);
    color: var(--text-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
    margin: 0 0 var(--space-4);
    line-height: var(--leading-relaxed);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--primary-dark);
}

/* ==========================================================================
   3. Layout & Container System
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--space-4);
}

.section {
    padding: var(--space-16) 0;
}

.section-lg {
    padding: var(--space-20) 0;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ==========================================================================
   4. Component Styles
   ========================================================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
    font-weight: 600;
    line-height: 1;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 6px rgba(239, 105, 90, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 12px rgba(239, 105, 90, 0.3);
    color: white;
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--secondary-color);
}

.btn-ghost:hover {
    background: var(--secondary-light);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

/* Cards */
.card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.card-featured {
    border: 2px solid var(--primary-color);
    position: relative;
}

.card-featured::before {
    content: 'POPULAR';
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 700;
}

.card-header {
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-color);
}

.card-body {
    margin-bottom: var(--space-4);
}

.card-footer {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-color);
}

/* Forms */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 600;
    color: var(--text-secondary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(239, 105, 90, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* Badges */
.badge {
    display: inline-block;
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    font-weight: 700;
    line-height: 1;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.badge-primary {
    background: var(--primary-light);
    color: var(--primary-dark);
}

.badge-secondary {
    background: var(--secondary-light);
    color: var(--secondary-dark);
}

.badge-success {
    background: rgba(72, 187, 120, 0.1);
    color: var(--success);
}

/* ==========================================================================
   5. Hero Section
   ========================================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-white) 0%, var(--primary-light) 100%);
}

.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--space-8);
    max-width: 1000px;
}

.hero-badge {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.hero-title {
    font-size: clamp(2rem, 5vw, var(--text-6xl));
    margin-bottom: var(--space-6);
    font-weight: 900;
}

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

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    line-height: var(--leading-relaxed);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-12);
    margin-bottom: var(--space-8);
}

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

.stat-number {
    display: block;
    font-size: var(--text-4xl);
    font-weight: 900;
    color: var(--primary-color);
    font-family: var(--font-numeric);
}

.stat-label {
    display: block;
    margin-top: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    margin-bottom: var(--space-2);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: var(--border-color);
    position: relative;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    animation: scrollLine 2s infinite;
}

/* ==========================================================================
   6. Feature Cards
   ========================================================================== */
.features {
    background: var(--bg-gray);
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-12);
}

.subtitle-en {
    display: block;
    font-size: var(--text-sm);
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: var(--space-2);
    font-weight: 700;
}

.title-ja {
    display: block;
    font-size: var(--text-4xl);
    font-weight: 900;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.feature-card {
    background: white;
    padding: var(--space-10);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.feature-card.featured {
    border: 2px solid var(--primary-color);
}

.feature-ribbon {
    position: absolute;
    top: -10px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-6);
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 40px;
    height: 40px;
    fill: white;
}

.feature-title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-6);
    text-align: left;
}

.feature-list li {
    padding: var(--space-2) 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.check-icon {
    width: 20px;
    height: 20px;
    background: var(--success);
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.check-icon::before {
    content: '✓';
    color: white;
    font-size: 12px;
}

.feature-detail {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    transition: gap var(--transition-base);
}

.feature-card:hover .feature-detail {
    gap: var(--space-2);
}

/* ==========================================================================
   7. Animations
   ========================================================================== */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scrollLine {
    0% {
        transform: scaleY(0);
        transform-origin: top;
    }
    50% {
        transform: scaleY(1);
        transform-origin: top;
    }
    51% {
        transform-origin: bottom;
    }
    100% {
        transform: scaleY(0);
        transform-origin: bottom;
    }
}

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

.fade-in {
    animation: fadeIn var(--transition-slow) ease forwards;
}

/* ==========================================================================
   8. Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--space-6);
    }
    
    .grid-cols-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-stats {
        gap: var(--space-8);
    }
}

@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.5rem;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    .section {
        padding: var(--space-12) 0;
    }
    
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
    
    .hero {
        min-height: 100vh;
    }
    
    .hero-content {
        padding: var(--space-4);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-6);
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card {
        padding: var(--space-6);
    }
}

@media (max-width: 480px) {
    :root {
        --text-base: 0.875rem;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: var(--text-base);
    }
    
    .stat-number {
        font-size: var(--text-2xl);
    }
}

/* ==========================================================================
   9. Utility Classes
   ========================================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.font-normal { font-weight: 400; }

.uppercase { text-transform: uppercase; }
.lowercase { text-transform: lowercase; }
.capitalize { text-transform: capitalize; }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.ml-4 { margin-left: var(--space-4); }
.mr-4 { margin-right: var(--space-4); }
.mx-auto { margin-left: auto; margin-right: auto; }

.p-4 { padding: var(--space-4); }
.pt-4 { padding-top: var(--space-4); }
.pb-4 { padding-bottom: var(--space-4); }
.pl-4 { padding-left: var(--space-4); }
.pr-4 { padding-right: var(--space-4); }

.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-white { background-color: white; }
.bg-gray { background-color: var(--bg-gray); }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-white { color: white; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.transition { transition: all var(--transition-base); }
.transition-fast { transition: all var(--transition-fast); }
.transition-slow { transition: all var(--transition-slow); }

/* Hover Effects */
.hover-scale:hover { transform: scale(1.05); }
.hover-lift:hover { transform: translateY(-4px); }
.hover-shadow:hover { box-shadow: var(--shadow-xl); }