/* ========================================
   超洗練デザイン - プレミアムマーケットプレイス
   テキストコントラスト改善版
   ======================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Poppins:wght@700;800;900&display=swap');

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    overflow-x: hidden;
    background-color: #fafbfc;
}

/* ========================================
   Hero Gradient Animation
   ======================================== */
.hero-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    background-size: 400% 400%;
    animation: gradientShift 8s ease infinite;
}

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

/* ========================================
   テキストシャドウによる視認性向上
   ======================================== */
.drop-shadow-lg {
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
}

.drop-shadow-xl {
    text-shadow: 0 6px 12px rgba(0, 0, 0, 0.4), 0 3px 6px rgba(0, 0, 0, 0.3);
}

.drop-shadow-2xl {
    text-shadow: 0 10px 20px rgba(0, 0, 0, 0.5), 0 5px 10px rgba(0, 0, 0, 0.4);
}

/* ========================================
   Glassmorphism Effects
   ======================================== */
.glass {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.glass-dark {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ========================================
   Premium Card Effects
   ======================================== */
.premium-card {
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
}

.premium-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: inherit;
    padding: 2px;
    background: linear-gradient(135deg, #667eea, #764ba2, #f093fb);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.premium-card:hover::before {
    opacity: 0.6;
}

.premium-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.25),
        0 0 60px rgba(102, 126, 234, 0.3);
}

/* ========================================
   Button Glow Effect
   ======================================== */
.btn-glow {
    position: relative;
    overflow: hidden;
}

.btn-glow::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
    transform: scale(0);
    transition: transform 0.6s ease;
}

.btn-glow:hover::before {
    transform: scale(1);
}

.btn-glow:hover {
    box-shadow: 
        0 20px 60px -12px rgba(102, 126, 234, 0.5),
        0 0 40px rgba(102, 126, 234, 0.3);
}

/* ========================================
   Gradient Text
   ======================================== */
.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   Floating Animation
   ======================================== */
.float-animation {
    animation: float 6s ease-in-out infinite;
}

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

/* ========================================
   Mesh Gradient Background
   ======================================== */
.mesh-gradient {
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    overflow: hidden;
}

.mesh-gradient::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    top: -50%;
    left: -50%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(255, 255, 255, 0.06) 0%, transparent 50%);
    animation: meshMove 20s ease-in-out infinite;
}

@keyframes meshMove {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(5%, 10%) rotate(120deg); }
    66% { transform: translate(-5%, 5%) rotate(240deg); }
}

/* ========================================
   Shimmer Effect
   ======================================== */
.shimmer {
    position: relative;
    overflow: hidden;
}

.shimmer::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* ========================================
   Scroll Reveal Animation
   ======================================== */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    animation: scrollReveal 0.8s ease forwards;
}

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

/* ========================================
   Responsive Typography
   ======================================== */
h1, h2, h3 {
    font-weight: 900;
    letter-spacing: -0.02em;
}

p {
    line-height: 1.7;
}

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

/* ========================================
   Background Decorations
   ======================================== */
.bg-decoration {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    pointer-events: none;
}

/* ========================================
   Premium Badge
   ======================================== */
.premium-badge {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    color: #000;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: 0 4px 12px rgba(255, 215, 0, 0.3);
}

/* ========================================
   Feature Tags
   ======================================== */
.feature-tag {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border: 1px solid rgba(102, 126, 234, 0.2);
    transition: all 0.3s ease;
}

.feature-tag:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
    border-color: rgba(102, 126, 234, 0.4);
    transform: translateY(-2px);
}

/* ========================================
   Nav Sticky with Blur
   ======================================== */
nav.sticky {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ========================================
   Mobile Optimizations
   ======================================== */
@media (max-width: 768px) {
    .hero-gradient {
        padding-top: 100px !important;
        padding-bottom: 80px !important;
    }
    
    h1 {
        font-size: 2.5rem !important;
        line-height: 1.2 !important;
    }
    
    .premium-card:hover {
        transform: translateY(-8px) scale(1.01);
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .float-animation,
    .shimmer,
    .scroll-reveal {
        animation: none !important;
    }
    
    .premium-card::before {
        display: none;
    }
}