:root {
    --primary-color: #0b1120;
    /* Midnight Navy - darker, more solemn */
    --secondary-color: #334155;
    /* Slate */
    --accent-color: #c5a059;
    /* Muted Gold - more metallic/elegant than yellow-gold */
    --accent-light: #e6c888;
    --accent-gradient: linear-gradient(135deg, #c5a059 0%, #aa853c 100%);
    --text-color: #1e293b;
    --text-on-dark: #f8fafc;
    --bg-light: #fdfdfc;
    /* Warm minimalist white */
    --bg-white: #ffffff;
    --alert-color: #b91c1c;
    /* Darker red for solemnity */
    --font-heading: 'Shippori Mincho', serif;
    --font-body: 'Noto Sans JP', sans-serif;
    --border-gold: 1px solid rgba(197, 160, 89, 0.4);
}

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

body {
    font-family: var(--font-body);
    color: var(--text-color);
    line-height: 2.0;
    /* More breathing room */
    background-color: var(--bg-light);
    font-size: 16px;
    letter-spacing: 0.03em;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.1em;
    /* Elegant spacing */
}

.container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background-color: rgba(255, 255, 255, 0.98);
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid rgba(197, 160, 89, 0.2);
}

.logo {
    font-size: 1.4rem;
    color: var(--primary-color);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-weight: 500;
    text-align: center;
    /* Center logo for solemnity */
}

/* Hero Section */
.hero {
    height: 90vh;
    min-height: 650px;
    background: linear-gradient(135deg, #0b1120 0%, #1a2336 100%);
    background-image: url(images/hero_bg.png);
    background-size: cover;
    background-position: center;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Centered content */
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-top: 70px;
    /* Header offset */
    /* Add a subtle texture visual if possible, or stick to deep gradient */
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Dark overlay with a gold vignette effect */
    background: radial-gradient(circle at center, rgba(11, 17, 32, 0.4) 0%, rgba(11, 17, 32, 0.9) 100%);
    z-index: 1;
}

/* Optional: Add a decorative border to hero content */
.hero .container {
    position: relative;
    z-index: 2;
    padding: 80px 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(11, 17, 32, 0.3);
    backdrop-filter: blur(2px);
    max-width: 900px;
}

.hero-title {
    font-size: 3.2rem;
    line-height: 1.5;
    margin-bottom: 2.5rem;
    color: #f8fafc;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
    background: linear-gradient(to bottom, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 4rem;
    opacity: 0.95;
    font-family: var(--font-heading);
    letter-spacing: 0.08em;
    border-top: 1px solid rgba(197, 160, 89, 0.5);
    border-bottom: 1px solid rgba(197, 160, 89, 0.5);
    padding: 1.5rem 0;
    display: inline-block;
}

/* Hook Section (Alert) */
.hook-section {
    padding: 100px 0;
    background-color: var(--bg-white);
    background-image: linear-gradient(var(--bg-light) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-light) 1px, transparent 1px);
    background-size: 40px 40px;
}

.alert-box {
    border: 4px double var(--primary-color);
    /* Double border for solemnity */
    padding: 50px;
    text-align: center;
    position: relative;
    background: #fff;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
    max-width: 800px;
    margin: 0 auto;
}

.alert-title {
    font-size: 1.6rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    display: inline-block;
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 10px;
}

.alert-text.lead {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 1rem;
    font-family: var(--font-heading);
}

.alert-text.critical {
    font-size: 2.2rem;
    color: var(--alert-color);
    font-weight: 700;
    font-family: var(--font-heading);
    margin-top: 1rem;
    letter-spacing: 0.05em;
}

/* Overview */
.overview-section {
    padding: 100px 0;
    text-align: center;
    background-color: #f6f6f4;
    border-top: 1px solid #e2e8f0;
    border-bottom: 1px solid #e2e8f0;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 2px;
    background-color: var(--accent-color);
    margin: 15px auto 0;
}

.section-desc {
    font-size: 1.15rem;
    color: var(--secondary-color);
    max-width: 700px;
    margin: 0 auto;
    font-feature-settings: "palt";
}

.highlight {
    background: transparent;
    color: var(--primary-color);
    font-weight: 700;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 2px;
}

/* Metrics Grid */
.metrics-section {
    padding: 120px 0;
    background-color: var(--bg-white);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    margin-top: 70px;
}

.card {
    padding: 40px 30px;
    background: var(--bg-white);
    border: 1px solid rgba(0, 0, 0, 0.05);
    /* Subtle base border */
    position: relative;
    transition: all 0.4s ease;
    overflow: hidden;
    /* For pseudo-elements */
}

/* Solemn Frame Effect */
.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    /* Top heavy border */
    background: var(--accent-color);
    opacity: 0.5;
    transition: opacity 0.3s;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    border-color: transparent;
}

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

.card-icon {
    width: 70px;
    height: 70px;
    margin-bottom: 25px;
    background: #f8fafc;
    border-radius: 50%;
    /* Circle icon background */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
}

.card-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(197, 160, 89, 0.3));
}

.card h4 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--primary-color);
    border-bottom: 1px dashed #cbd5e1;
    padding-bottom: 10px;
    display: inline-block;
    letter-spacing: 0.05em;
}

.card p {
    font-size: 0.95rem;
    color: var(--secondary-color);
    line-height: 1.9;
}

/* Result Preview (Placeholder) */
.result-preview-section {
    padding: 100px 0;
    background-color: #0b1120;
    background-image: radial-gradient(circle at bottom, #1e293b 0%, #0b1120 70%);
    color: white;
    text-align: center;
    border-top: 4px solid var(--accent-color);
}

.result-preview-section .section-title {
    color: var(--accent-light);
    /* Gold text on dark */
    margin-bottom: 10px;
}

.section-subtitle {
    opacity: 0.7;
    margin-bottom: 60px;
    font-family: var(--font-heading);
}

.screenshot-placeholder {
    width: 100%;
    max-width: 900px;
    background: transparent;
    margin: 0 auto;
    display: block;
    position: relative;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.screenshot-placeholder::after {
    /* Reflection effect below */
    content: '';
    position: absolute;
    bottom: -20px;
    left: 5%;
    width: 90%;
    height: 20px;
    background: radial-gradient(ellipse at center, rgba(197, 160, 89, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
}

.screenshot-placeholder img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

/* CTA Buttons */
.cta-button {
    display: inline-block;
    background: var(--accent-gradient);
    color: white;
    padding: 18px 50px;
    border-radius: 4px;
    /* More solemn/traditional than fully rounded */
    text-decoration: none;
    font-weight: 700;
    font-size: 1.15rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(197, 160, 89, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-family: var(--font-heading);
    letter-spacing: 0.05em;
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(197, 160, 89, 0.5);
}

.cta-section {
    padding: 140px 0;
    text-align: center;
    background: white;
}

.cta-title {
    font-size: 2.6rem;
    margin-bottom: 40px;
    color: var(--primary-color);
    line-height: 1.4;
}

.cta-button.large {
    font-size: 1.4rem;
    padding: 24px 80px;
}

/* Footer */
.footer {
    padding: 40px 0;
    background-color: #05080f;
    /* Pitch black/navy */
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
    font-size: 0.85rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .alert-text.critical {
        font-size: 1.8rem;
    }

    .container {
        padding: 0 20px;
    }

    .cta-button.large {
        padding: 20px 40px;
        width: 100%;
        max-width: 350px;
    }
}