/* --- Base Styles & Variables --- */
:root {
    --primary-bg: #001a33;
    --secondary-bg: #0a294d;
    --accent-emerald: #00e676;
    --accent-gold-start: #f1c40f;
    --accent-gold-end: #e67e22;
    --text-primary: #fdfdfd;
    --text-secondary: #aaa;
    --white: #ffffff;
    --black: #000000;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--primary-bg);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Animations --- */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes shine { 100% { left: 125%; } }

.fade-in { animation: fadeIn 1s ease-out; }
.fade-in-up { animation: fadeInUp 0.8s ease-out; }

/* --- Header --- */
.header {
    background: rgba(0, 26, 51, 0.95);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header .container { display: flex; justify-content: space-between; align-items: center; }
.logo-text { font-size: 1.5rem; font-weight: bold; color: var(--white); text-transform: uppercase; letter-spacing: 2px; }
.logo-text::after { content: '.'; color: var(--accent-gold-start); }

.nav ul { display: flex; list-style: none; }
.nav ul li { margin-left: 30px; }
.nav a { text-decoration: none; color: var(--text-secondary); font-size: 0.9rem; font-weight: bold; transition: color 0.3s; }
.nav a:hover { color: var(--white); }

/* --- Hero Section (3D & Light) --- */
.hero-3d {
    background: radial-gradient(circle at center, var(--secondary-bg) 0%, var(--primary-bg) 70%);
    padding: 150px 0;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 10;
    animation: fadeInUp 1s ease-out;
}

.badge-gold {
    display: inline-block;
    border: 1px solid var(--accent-gold-start);
    color: var(--accent-gold-start);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 25px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 25px;
    line-height: 1.2;
    color: var(--white);
    font-weight: 700;
}

.highlight-gold {
    background: linear-gradient(90deg, var(--accent-gold-start), var(--accent-gold-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 4rem;
}

.hero-lead {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 50px;
}

.hero-3d-bg {
    position: absolute;
    top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(0, 230, 118, 0.1) 0%, rgba(0,0,0,0) 50%);
    opacity: 0.5;
    animation: float 10s infinite ease-in-out;
    z-index: 1;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 20px 40px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    margin: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 1rem;
}

.btn:hover { transform: translateY(-3px) scale(1.02); }

.btn-primary-gold {
    background: linear-gradient(90deg, var(--accent-gold-start), var(--accent-gold-end));
    color: var(--black);
}

.btn-secondary-outline {
    border: 1px solid rgba(255,255,255,0.3);
    color: var(--white);
}
.btn-secondary-outline:hover { background: rgba(255,255,255,0.05); }

.cta-area{display:flex;justify-content:center;align-items:stretch;gap:18px;flex-wrap:nowrap}
.cta-area .btn{margin:0;display:flex;align-items:center;justify-content:center;min-height:64px;white-space:nowrap}
.article-title{font-size:2.4rem;line-height:1.25;margin:16px 0 10px;color:var(--white);text-align:center;font-weight:700}
.article-summary{margin-top:18px;background:rgba(255,255,255,0.03);border:1px solid rgba(255,255,255,0.10);border-radius:14px;padding:16px;text-align:left}
.article-summary strong{display:block;margin-bottom:10px;color:var(--accent-gold-start)}
.article-summary ul{margin-left:18px;color:var(--text-primary)}

.sticky-cta{position:fixed;left:0;right:0;bottom:0;background:rgba(0,0,0,0.72);backdrop-filter:blur(10px);border-top:1px solid rgba(255,255,255,0.08);padding:10px 12px;z-index:1200}
.sticky-cta-inner{max-width:900px;margin:0 auto;display:flex;gap:12px;align-items:center;justify-content:space-between}
.sticky-cta-text{color:var(--text-secondary);font-size:12px}
.sticky-cta-actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end}
.sticky-btn{display:inline-block;text-decoration:none;font-weight:700;border-radius:10px;padding:10px 12px;font-size:13px}
.sticky-btn-primary{background:linear-gradient(90deg,var(--accent-gold-start),var(--accent-gold-end));color:#000}
.sticky-btn-secondary{background:transparent;border:1px solid rgba(255,255,255,0.35);color:var(--white)}

.btn-shine { position: relative; overflow: hidden; }
.btn-shine::after {
    content: ''; position: absolute; top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.5) 50%, rgba(255,255,255,0) 100%);
    animation: shine 3s infinite;
}

/* --- Problem Section --- */
.problem-st { padding: 100px 0; background: var(--secondary-bg); }
.section-title-st { text-align: center; font-size: 2.2rem; margin-bottom: 60px; font-weight: 700; color: var(--white); }
.problem-grid-st { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.problem-card-st {
    background: var(--primary-bg);
    padding: 30px;
    border: 1px solid rgba(255,255,255,0.05);
    border-left: 3px solid var(--accent-emerald);
    color: var(--text-primary);
    font-size: 1.1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

/* --- Category Section (3D & Icon) --- */
.cases-st { padding: 100px 0; }
.section-subtext-st { text-align: center; color: var(--text-secondary); margin-bottom: 60px; max-width: 600px; margin-left: auto; margin-right: auto; }

.category-grid-st { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; }

.category-card-3d {
    display: block; text-decoration: none; color: var(--text-primary);
    background: var(--secondary-bg);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: all 0.5s;
    transform: perspective(1000px) rotateX(0deg);
    position: relative;
    overflow: hidden;
}

.category-card-3d::before {
    content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(0, 230, 118, 0.15) 0%, rgba(0,0,0,0) 60%);
    opacity: 0; transition: opacity 0.5s; z-index: 1;
}

.category-card-3d:hover {
    transform: perspective(1000px) rotateX(10deg) translateY(-10px);
    border-color: var(--accent-emerald);
    box-shadow: 0 20px 50px rgba(0, 230, 118, 0.1);
}

.category-card-3d:hover::before { opacity: 1; }

.icon-wrap {
    width: 60px; height: 60px;
    border: 1px solid var(--accent-emerald);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 25px;
    color: var(--accent-emerald);
    font-size: 1.5rem;
    position: relative; z-index: 10;
}

.icon::before { content: '✓'; }

.category-card-3d h4 { color: var(--white); margin-bottom: 15px; font-size: 1.3rem; font-weight: 700; position: relative; z-index: 10; }
.category-card-3d p { color: var(--text-secondary); font-size: 0.95rem; position: relative; z-index: 10; }

.highlight-card-gold { border-color: var(--accent-gold-start); background: rgba(241, 196, 15, 0.05); }
.highlight-card-gold .icon-wrap { border-color: var(--accent-gold-start); color: var(--accent-gold-start); }
.highlight-card-gold:hover {
    border-color: var(--accent-gold-start);
    box-shadow: 0 20px 50px rgba(241, 196, 15, 0.1);
}

/* --- Product Banner --- */
.product-banner-premium { padding: 100px 0; background: linear-gradient(135deg, var(--primary-bg) 0%, var(--black) 100%); }
.banner-inner-st {
    background: var(--secondary-bg);
    padding: 60px;
    border-radius: 20px;
    border: 1px solid var(--accent-gold-start);
    display: flex; justify-content: space-between; align-items: center;
    box-shadow: 0 20px 60px rgba(241, 196, 15, 0.15);
}

.banner-text h3 { font-size: 2.2rem; margin-bottom: 20px; color: var(--white); font-weight: 700; }
.banner-text p { color: var(--text-secondary); max-width: 500px; }

.price-options-st { display: flex; gap: 20px; }

.btn-buy-prem {
    background: var(--white);
    color: var(--black);
    padding: 25px;
    min-width: 220px;
    text-align: center;
    margin: 0;
}

.btn-buy-prem span { display: block; font-size: 1.8rem; font-weight: 700; margin-top: 5px; }

.btn-buy-prem.pro {
    background: var(--accent-gold-start);
    border-color: var(--accent-gold-start);
}

/* --- Footer --- */
.footer-st { background: var(--black); color: var(--text-secondary); padding: 60px 0; text-align: center; }
.footer-nav { margin-bottom: 30px; }
.footer-nav a { color: var(--text-secondary); margin: 0 15px; text-decoration: none; font-size: 0.9rem; }
.footer-nav a:hover { color: var(--white); }
.copyright { font-size: 0.8rem; opacity: 0.5; }

/* --- Article Helpers --- */
.article-box{background: rgba(0,0,0,0.15);border:1px solid rgba(255,255,255,0.08);border-radius:14px;padding:18px}
.article-note{background: rgba(241,196,15,0.08);border:1px solid rgba(241,196,15,0.25);border-radius:12px;padding:12px;margin-bottom:14px;color:var(--text-primary)}
.article-content p{margin:12px 0;color:var(--text-primary)}
.article-content ul,.article-content ol{margin:10px 0 10px 22px;color:var(--text-primary)}
.article-content a{color:var(--accent-gold-start)}
.article-content a:hover{opacity:.9}
.article-toc ul{margin:10px 0 10px 22px}
.article-toc a{color:var(--accent-emerald)}
.breadcrumb{padding:18px 0 0;font-size:0.85rem;color:var(--text-secondary)}
.breadcrumb a{color:var(--accent-emerald);text-decoration:none}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb span{margin:0 6px;color:var(--text-secondary)}
.article-wrapper{background: var(--secondary-bg);border-radius: 15px;padding: 40px;margin: 22px 0 60px;border: 1px solid rgba(255,255,255,0.05);box-shadow: 0 10px 30px rgba(0,0,0,0.2)}
.article-header{border-bottom:1px solid rgba(255,255,255,0.1);padding-bottom:30px;margin-bottom:30px}
.category-tag{display:inline-block;background:rgba(0,230,118,0.1);color:var(--accent-emerald);border:1px solid var(--accent-emerald);padding:5px 15px;border-radius:50px;font-size:0.85rem;font-weight:700;margin-bottom:15px}
.article-title{font-size:2rem;line-height:1.4;color:var(--white);margin-bottom:15px;font-weight:700;text-align:left}
.article-meta{color:var(--text-secondary);font-size:0.9rem}
.article-content{font-size:1.05rem;color:var(--text-primary)}
.article-content h2{font-size:1.5rem;color:var(--accent-gold-start);margin:50px 0 25px;padding-bottom:10px;border-bottom:2px solid rgba(255,255,255,0.08);position:relative}
.article-content h2::after{content:'';position:absolute;left:0;bottom:-2px;width:50px;height:2px;background:var(--accent-gold-start)}
.article-content h3{font-size:1.2rem;color:var(--white);margin:40px 0 20px;padding-left:15px;border-left:4px solid var(--accent-emerald)}
.article-content ul{margin:0 0 25px 20px;padding:20px;background: rgba(13, 54, 102, 0.55);border-radius:10px}
.article-content li{margin-bottom:10px;list-style-type:disc}
.box-danger{background:rgba(255,77,77,0.10);border-left:4px solid var(--danger);padding:20px;border-radius:0 10px 10px 0;margin-bottom:25px}
.box-point{background:rgba(241,196,15,0.06);border:1px solid var(--accent-gold-start);padding:20px;border-radius:10px;margin-bottom:25px}
.box-point-title{color:var(--accent-gold-start);font-weight:800;margin-bottom:10px;display:block}
.article-cta{background:linear-gradient(135deg,var(--primary-bg) 0%, #000000 100%);border:2px solid var(--accent-gold-start);border-radius:15px;padding:40px;text-align:center;margin:30px 0 60px;box-shadow:0 15px 40px rgba(241,196,15,0.15);position:relative;overflow:hidden}
.cta-ribbon{position:absolute;top:15px;left:-35px;background:var(--danger);color:white;padding:5px 40px;transform:rotate(-45deg);font-size:0.8rem;font-weight:800;letter-spacing:1px}
.cta-title{font-size:1.6rem;color:var(--white);margin-bottom:15px;font-weight:800}
.cta-desc{color:var(--text-secondary);margin-bottom:30px;font-size:1rem}
.btn-cta{display:inline-block;background:linear-gradient(90deg,var(--accent-gold-start),var(--accent-gold-end));color:#000;padding:20px 40px;border-radius:10px;text-decoration:none;font-weight:800;font-size:1.1rem;transition:0.3s;box-shadow:0 5px 15px rgba(241,196,15,0.4)}
.btn-cta:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(241,196,15,0.6)}

/* --- Responsive --- */
@media (max-width: 992px) {
    .banner-inner-st { flex-direction: column; text-align: center; padding: 40px; }
    .banner-text { margin-bottom: 40px; }
    .price-options-st { flex-direction: column; width: 100%; }
}

@media (max-width: 768px) {
    .hero-title { font-size: 2.2rem; }
    .highlight-gold { font-size: 2.5rem; }
    .hero-content { padding: 100px 0; }
    .cta-area{flex-direction:column;align-items:stretch;gap:12px}
    .cta-area .btn{white-space:normal}
    .nav { display: none; }
}
@media (min-width: 901px){.sticky-cta{display:none}}