:root {
    --color-primary: #003366;
    /* Navy Blue */
    --color-accent: #bf0000;
    /* Deep Red (Main Site Match) */
    --color-accent-hover: #8c0000;
    --color-text-main: #222222;
    /* Darker grey for better contrast */
    --color-text-light: #555555;
    --color-bg-light: #f4f7fa;
    /* Premium subtle blue-grey */
    --color-bg-white: #ffffff;
    --font-base: 'Noto Sans JP', sans-serif;
    --transition-speed: 0.3s;
    --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.08);
    /* Soft, deep shadow */
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-base);
    color: var(--color-text-main);
    line-height: 2.0;
    /* More breathing room */
    background-color: var(--color-bg-white);
    letter-spacing: 0.03em;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-speed);
}

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

/* Utilities */
.container {
    width: 100%;
    max-width: 1140px;
    /* Slightly wider for modern feel */
    margin: 0 auto;
    padding: 0 20px;
}

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

.text-white {
    color: white;
}

.bg-light {
    background-color: var(--color-bg-light);
}

.bg-dark {
    background-color: var(--color-text-main);
}

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

.sp-only {
    display: none;
}

@media (max-width: 768px) {
    .sp-only {
        display: block;
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 16px 45px;
    border-radius: 50px;
    font-weight: 700;
    text-align: center;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    letter-spacing: 0.05em;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    color: white;
    border: none;
}

.btn-primary:hover {
    filter: brightness(1.1);
}

.btn-orange {
    background-color: var(--color-accent);
    color: white;
    font-size: 1.2rem;
}

.btn-white-outline {
    background-color: transparent;
    border: 2px solid white;
    color: white;
    font-size: 1.2rem;
}

.btn-white-outline:hover {
    background-color: white;
    color: var(--color-primary);
}

.btn-sm {
    padding: 10px 25px;
    font-size: 0.9rem;
}

.btn-lg {
    padding: 20px 60px;
}

/* Header */
.header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.98);
    /* Less transparent */
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.03);
    /* Softer shadow */
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--color-primary);
    letter-spacing: 0.05em;
}

.logo span {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-light);
    margin-left: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.nav a {
    margin-left: 30px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-main);
}

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

.nav .btn {
    margin-left: 30px;
    color: white !important;
}

/* Hero */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    color: white;
    padding-top: 80px;
    /* Header height */
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(0, 30, 60, 0.9) 0%, rgba(0, 30, 60, 0.4) 100%);
    /* Deeper navy */
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
}

.hero-sub {
    font-size: 1.1rem;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.95);
    /* Solid for readability */
    color: var(--color-primary);
    display: inline-block;
    padding: 8px 20px;
    border-radius: 4px;
    margin-bottom: 30px;
    letter-spacing: 0.1em;
}

.hero-main {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 40px;
    text-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.hero-desc {
    font-size: 1.3rem;
    margin-bottom: 50px;
    opacity: 1;
    font-weight: 500;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.note {
    font-size: 0.85rem;
    margin-top: 15px;
    opacity: 0.9;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 1s cubic-bezier(0.2, 1, 0.3, 1);
    /* Elegant easing */
}

.fade-in.active {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 {
    transition-delay: 0.2s;
}

.delay-2 {
    transition-delay: 0.4s;
}

.delay-3 {
    transition-delay: 0.6s;
}

/* Section Base */
.section {
    padding: 120px 0;
    /* More vertical space */
}

.section-title {
    margin-bottom: 80px;
}

.section-title h2 {
    font-size: 2.4rem;
    color: var(--color-primary);
    margin-bottom: 20px;
    letter-spacing: 0.05em;
}

.revenue .section-title h2 {
    font-size: 2.4rem;
    color: #0775e3;
    margin-bottom: 20px;
    letter-spacing: 0.05em;
}



.section-title p {
    font-size: 1.1rem;
    color: var(--color-text-light);
}

/* Problem */
.problem-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.problem-item {
    text-align: center;
    padding: 30px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: white;
}

.problem-item .icon {
    width: 70px;
    height: 70px;
    background-color: #f0f4f8;
    /* Slightly blue-ish gray for cleaner look */
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    transition: transform 0.3s;
}

.problem-item:hover .icon {
    transform: scale(1.1);
    background-color: var(--color-primary);
    color: white;
}

.problem-item .icon svg {
    width: 32px;
    height: 32px;
}

.problem-item p {
    font-weight: 700;
}

.problem-solution-text p {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* Solution */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header .label {
    display: inline-block;
    background-color: var(--color-accent);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 2.5rem;
    line-height: 1.4;
    color: var(--color-primary);
}

.solution-content {
    max-width: 800px;
    margin: 0 auto;
}

.box-highlight {
    background-color: white;
    border-left: 5px solid var(--color-accent);
    padding: 30px;
    margin: 40px 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.box-highlight h3 {
    color: var(--color-primary);
    margin-bottom: 15px;
}

/* English Section Labels */
.section-en {
    display: block;
    font-size: 0.9rem;
    font-weight: 900;
    color: var(--color-accent);
    letter-spacing: 0.2em;
    margin-bottom: 15px;
    font-family: sans-serif;
    text-transform: uppercase;
}

/* Background Patterns */
.bg-dots {
    background-color: var(--color-bg-light);
    background-image: radial-gradient(#ddd 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Strength (New Circular Layout) */
.strength-wrapper {
    padding: 20px 0;
}

.strength-circle-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 30px;
}

.strength-circle-item {
    width: 260px;
    height: 260px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 10px 25px rgba(0, 51, 102, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 25px;
    position: relative;
    border: 5px solid #f0f4f8;
    transition: all 0.3s ease;
}

.strength-circle-item:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--color-accent);
    box-shadow: 0 15px 35px rgba(0, 51, 102, 0.15);
    z-index: 2;
}

.strength-circle-item .circle-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
}

.point-label {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 3px 12px;
    border-radius: 12px;
    margin-bottom: 15px;
    letter-spacing: 0.05em;
}

.strength-circle-item:hover .point-label {
    background: var(--color-accent);
}

.strength-circle-item h3 {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: 10px;
    line-height: 1.4;
    font-weight: 700;
}

.strength-circle-item p {
    font-size: 0.85rem;
    color: var(--color-text-light);
    line-height: 1.5;
    margin: 0;
}

/* Revenue */
.revenue-content {
    max-width: 800px;
    margin: 0 auto;
}

.revenue-note {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Support */
.support-steps {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.step h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 15px;
    margin-bottom: 25px;
}

.step ul li {
    margin-bottom: 20px;
    padding-left: 20px;
    position: relative;
}

.step ul li::before {
    content: "•";
    color: var(--color-accent);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Target */
.target-message {
    max-width: 800px;
    margin: 0 auto 60px;
}

.target-message h2 {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.target-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 30px;
}

.target-item {
    background: white;
    padding: 30px;
    border-radius: 10px;
    width: 300px;
    text-align: center;
    border-top: 5px solid var(--color-primary);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.target-item h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
}

/* FAQ */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border: 1px solid #eee;
    margin-bottom: 15px;
    border-radius: 8px;
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    font-weight: 700;
    cursor: pointer;
    background: #fdfdfd;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: "+";
    font-size: 1.5rem;
    color: var(--color-primary);
}

.faq-item.active .faq-question::after {
    content: "-";
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s;
    background: white;
    color: var(--color-text-light);
}

.faq-item.active .faq-answer {
    padding: 20px;
    max-height: 500px;
    border-top: 1px solid #eee;
}

/* CTA */
.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 40px 0;
    flex-wrap: wrap;
}

.cta-note {
    font-weight: bold;
    color: #ffdcb3;
}

.check-icon {
    margin-right: 10px;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 50px 0;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 900;
    margin-bottom: 20px;
}

.footer-links {
    margin: 20px 0;
    display: flex;
    justify-content: center;
    gap: 30px;
}

.footer-links a {
    color: #888;
}

.footer-links a:hover {
    color: white;
}

.copyright {
    opacity: 0.5;
    font-size: 0.8rem;
}


/* Responsive */
@media (max-width: 768px) {

    /* Header & Nav */
    .header .nav {
        display: none;
    }

    /* Simplified nav for mobile */
    .header-container {
        padding: 10px 15px;
    }

    .logo {
        font-size: 1.2rem;
    }

    /* Hero */
    .hero {
        height: auto;
        min-height: 100vh;
        padding-top: 100px;
        padding-bottom: 60px;
        text-align: left;
        /* Ensure readability */
    }

    .hero-main {
        font-size: 2.0rem;
        margin-bottom: 20px;
    }

    .hero-sub {
        font-size: 0.9rem;
        margin-bottom: 15px;
    }

    .hero-desc {
        font-size: 1rem;
        margin-bottom: 30px;
        line-height: 1.6;
    }

    .hero-content {
        padding: 0 20px;
    }

    /* Global Section Adjustments */
    .section {
        padding: 60px 0;
    }

    /* Reduce padding */
    .section-title {
        margin-bottom: 40px;
    }

    .section-title h2 {
        font-size: 1.5rem;
        line-height: 1.4;
    }

    .section-title p {
        font-size: 0.95rem;
        margin-top: 10px;
    }

    /* Problem Section */
    .problem-list {
        grid-template-columns: 1fr;
        /* Stack vertically */
        gap: 20px;
    }

    .problem-item {
        padding: 20px;
        display: flex;
        align-items: center;
        text-align: left;
    }

    .problem-item .icon {
        margin: 0 20px 0 0;
        width: 50px;
        height: 50px;
        line-height: 50px;
        font-size: 1.2rem;
        flex-shrink: 0;
    }

    .problem-item p {
        font-size: 0.95rem;
        margin: 0;
    }

    .problem-solution-text p {
        font-size: 1.1rem;
    }

    /* Solution Section */
    .section-header h2 {
        font-size: 1.6rem;
    }

    .box-highlight {
        padding: 20px;
        margin: 30px 0;
    }

    .box-highlight h3 {
        font-size: 1.2rem;
    }

    /* Strength Section */
    .strength-wrapper {
        padding: 0;
    }

    .strength-circle-grid {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    .strength-circle-item {
        width: 100%;
        height: auto;
        min-height: auto;
        border-radius: 15px;
        /* Box on mobile */
        padding: 30px 20px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    }

    .strength-circle-item .circle-content {
        align-items: flex-start;
        /* Left align on mobile for readability */
        text-align: left;
    }

    .point-label {
        margin-bottom: 10px;
    }

    .strength-circle-item h3 {
        font-size: 1.2rem;
        margin-bottom: 8px;
    }

    .strength-circle-item p {
        font-size: 0.9rem;
    }

    /* Support Section */
    .support-steps {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    /* Target Section */
    .target-message h2 {
        font-size: 1.4rem;
    }

    .target-list {
        flex-direction: column;
        align-items: center;
    }

    .target-item {
        width: 100%;
        max-width: 100%;
    }

    /* CTA Section */
    .cta-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .btn-lg {
        width: 100%;
        padding: 15px;
        font-size: 1rem;
    }

    .cta-note {
        font-size: 0.8rem;
        margin-top: 20px;
    }

    /* Footer */
    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}

/* Video Section */
.video-container {
    max-width: 900px;
    margin: 0 auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    overflow: hidden;
    background: #000;
}

.video-container video {
    display: block;
    width: 100%;
    height: auto;
}

.video-header {
    margin-bottom: 40px;
}

.video-caption {
    color: var(--color-text-light);
    font-size: 0.85rem;
    margin-top: 15px;
    opacity: 0.8;
}