/* ==========================================================================
   Variables
   ========================================================================== */
:root {
    /* Brand Colors */
    --color-primary: #0047BA;
    /* Royal Blue */
    --color-primary-dark: #003380;
    --color-accent: #F15A24;
    /* Rocket Orange */
    --color-accent-hover: #D14010;

    /* Text Colors */
    --color-text-main: #1A1A1A;
    --color-text-sub: #4A5568;
    --color-text-white: #FFFFFF;

    /* Background Colors */
    --color-bg-body: #F8FAFC;
    --color-bg-light: #F1F5F9;
    --color-bg-white: #FFFFFF;
    --color-bg-dark: #0F172A;
    /* New Dark Background */

    /* Spacing */
    --spacing-xs: 0.5rem;
    /* 8px */
    --spacing-sm: 1rem;
    /* 16px */
    --spacing-md: 2rem;
    /* 32px */
    --spacing-lg: 4rem;
    /* 64px */
    --spacing-xl: 8rem;
    /* 128px */

    /* Typography */
    --font-base: 'Noto Sans JP', sans-serif;
    --font-en: 'Roboto', sans-serif;

    /* Header Height */
    --header-height: 80px;

    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-base);
    color: var(--color-text-main);
    background-color: var(--color-bg-body);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

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

ul,
ol {
    list-style: none;
}

/* ==========================================================================
   Components
   ========================================================================== */
/* Buttons */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 1rem 3rem;
    font-weight: 700;
    border-radius: 9999px;
    /* Pill shape */
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    font-size: 1rem;
    letter-spacing: 0.05em;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active {
    transform: translateY(0);
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-accent) 0%, #FF7E5F 100%);
    color: var(--color-text-white);
    border: none;
}

.btn--primary:hover {
    background: linear-gradient(135deg, var(--color-accent-hover) 0%, #E66A4D 100%);
}

.btn--white {
    background-color: #FFFFFF;
    color: var(--color-primary);
}

.btn--white:hover {
    background-color: #F8FAFC;
}

.btn--sm {
    padding: 0.6rem 1.8rem;
    font-size: 0.9rem;
}

.btn--lg {
    padding: 1.25rem 4rem;
    font-size: 1.125rem;
}

/* Section Title */
.section__title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.section__title span {
    display: block;
    font-family: var(--font-en);
    font-size: 1rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    font-weight: 700;
}

.section__title--white,
.section__title--white span {
    color: var(--color-text-white);
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    position: relative;
}

/* ==========================================================================
   Layout Styles
   ========================================================================== */
/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    height: 100%;
}

.header__logo {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.05em;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: var(--color-text-white);
    text-align: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Elegant gradient mimicking professional corporate vibes */
    background: radial-gradient(circle at 80% 20%, #1e5cc2 0%, var(--color-primary) 50%, #002D7A 100%);
    z-index: 0;
}

/* Particle Container (Canvas) */
#hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.hero__content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    padding: 0 var(--spacing-sm);
}

.hero__sub {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    /* GSAP target */
    opacity: 0;
    transform: translateY(20px);
}

.hero__title {
    font-size: 4rem;
    /* Large and bold */
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero__title-line {
    display: block;
    /* GSAP target */
    opacity: 0;
    transform: translateY(30px);
}

.hero__cta {
    /* GSAP target */
    opacity: 0;
    transform: translateY(20px);
}

.hero__note {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Sections */
.section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

/* Problems (Dark Section) */
.section.problems {
    background-color: var(--color-bg-dark);
    color: var(--color-text-white);
    padding-bottom: calc(var(--spacing-xl) + 2rem);
}

.problems__list {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.problem-item {
    background: rgba(255, 255, 255, 0.05);
    /* Glass dark */
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md);
    width: 280px;
    height: 280px;
    border-radius: 50%;
    /* Circle shape layout */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    transition: transform 0.3s ease;
}

.problem-item:hover {
    transform: scale(1.05);
    background: rgba(255, 255, 255, 0.1);
}

.problem-item__text {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.6;
}

.problems__arrow {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    position: relative;
    padding-top: 2rem;
}

.problems__arrow::before {
    content: '▼';
    display: block;
    font-size: 2rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-10px);
    }

    60% {
        transform: translateY(-5px);
    }
}

/* About */
.section.about {
    background-color: var(--color-bg-white);
}

.about__content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.about__content .text {
    font-size: 1.25rem;
    line-height: 2.2;
    font-weight: 500;
    color: var(--color-text-main);
}

/* Market Data */
.section.market-data {
    background-color: var(--color-bg-light);
}

.market-data__lead {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.market-data__graph-wrapper {
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
    background: #fff;
    padding: var(--spacing-md);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.graph-container {
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    height: 300px;
    position: relative;
    padding-bottom: 2rem;
}

.graph-bar {
    width: 15%;
    background-color: #E2E8F0;
    height: 0;
    /* Animated */
    border-radius: 8px 8px 0 0;
    position: relative;
    transition: height 1.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.graph-bar.active {
    background-color: var(--color-accent);
    /* Highlight recent year */
}

.graph-bar::after {
    content: attr(data-label);
    position: absolute;
    bottom: -2rem;
    left: 50%;
    transform: translateX(-50%);
    font-weight: 700;
    color: var(--color-text-sub);
}

.market-data__note {
    text-align: right;
    font-size: 0.8rem;
    color: var(--color-text-sub);
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
}

.market-data__text {
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* Features */
.section.features {
    background-color: var(--color-bg-white);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background: var(--color-bg-light);
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.4s ease;
    border: 1px solid rgba(0, 0, 0, 0.03);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    background: #fff;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card__icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    display: inline-block;
    background: #fff;
    width: 100px;
    height: 100px;
    line-height: 100px;
    border-radius: 50%;
    color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.feature-card__title {
    font-size: 1.5rem;
    color: var(--color-text-main);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.feature-card__text {
    color: var(--color-text-sub);
    line-height: 1.8;
}

/* Flow */
.section.flow {
    background-color: var(--color-bg-light);
}

.flow__list {
    max-width: 700px;
    margin: 0 auto;
}

.flow__item {
    display: flex;
    flex-direction: row;
    /* Horizontal on desktop */
    align-items: center;
    background: var(--color-bg-white);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: 16px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 1;
}

.flow__item:not(:last-child)::after {
    content: '';
    position: absolute;
    bottom: -34px;
    left: 50px;
    /* Aligned with circle */
    width: 2px;
    height: 34px;
    background-color: var(--color-primary);
    opacity: 0.3;
}

.flow__step {
    font-family: var(--font-en);
    color: var(--color-bg-white);
    background-color: var(--color-primary);
    font-weight: 700;
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    margin-right: var(--spacing-md);
    flex-shrink: 0;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    box-shadow: 0 4px 10px rgba(0, 71, 186, 0.3);
}

.flow__content {
    text-align: left;
}

.flow__title {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
    color: var(--color-primary);
    font-weight: 700;
}

.flow__text {
    color: var(--color-text-sub);
    font-size: 0.95rem;
}

/* FAQ */
.section.faq {
    background-color: var(--color-bg-white);
}

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

.faq__item {
    background: var(--color-bg-light);
    border-radius: 12px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    box-shadow: none;
    transition: box-shadow 0.3s ease;
}

.faq__item:hover {
    box-shadow: var(--shadow-md);
}

.faq__question {
    font-size: 1.1rem;
    color: var(--color-text-main);
    padding-left: 2rem;
    position: relative;
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.faq__question::before {
    content: 'Q';
    color: var(--color-accent);
    position: absolute;
    left: 0;
    top: 0;
    font-family: var(--font-en);
    font-weight: 900;
    font-size: 1.2rem;
}

.faq__answer {
    padding-left: 2rem;
    color: var(--color-text-sub);
    font-size: 1rem;
    line-height: 1.8;
    position: relative;
}

.faq__answer::before {
    content: 'A';
    color: var(--color-primary);
    position: absolute;
    left: 0;
    top: 0;
    font-family: var(--font-en);
    font-weight: 900;
    font-size: 1.2rem;
}

/* Contact */
.section.contact {
    text-align: center;
    background: linear-gradient(135deg, #1e5cc2 0%, #002D7A 100%);
    color: #fff;
    padding: var(--spacing-xl) 0 8rem;
    /* Extra padding for Floating CTA clearance */
}

.contact__lead {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.contact__action {
    display: inline-block;
}

.contact__note {
    font-size: 0.875rem;
    margin-top: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.7);
}

/* Footer */
.footer {
    background-color: #0F172A;
    color: var(--color-text-white);
    padding: var(--spacing-lg) 0 6rem;
    /* Extra bottom padding for mobile CTA */
    text-align: center;
    font-size: 0.875rem;
}

.footer__disclaimer {
    color: #94A3B8;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    border: 1px solid #334155;
    padding: var(--spacing-sm);
    display: inline-block;
    border-radius: 4px;
}

.footer__copyright {
    color: #64748B;
    font-family: var(--font-en);
}

/* Floating CTA */
.floating-cta {
    position: fixed;
    bottom: 20px;
    left: 0;
    width: 100%;
    padding: 0 var(--spacing-sm);
    z-index: 9999;
    pointer-events: none;
    /* Allow clicking through container */
    opacity: 0;
    /* Hidden by default (via JS) */
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.floating-cta.visible {
    opacity: 1;
    transform: translateY(0);
}

.btn--full {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    pointer-events: auto;
    /* Re-enable pointer events for button */
}

/* Utility */
.u-md-none {
    display: none;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 5rem;
    }

    .u-md-none {
        display: block;
        /* Show line breaks on mobile */
    }

    .hero__title {
        font-size: 2.5rem;
    }

    .hero__sub {
        font-size: 1.1rem;
    }

    .section__title {
        font-size: 1.75rem;
    }

    .problem-item {
        width: 100%;
        height: auto;
        padding: 2rem;
        border-radius: 12px;
    }

    .flow__item {
        flex-direction: column;
        text-align: center;
    }

    .flow__step {
        margin-right: 0;
        margin-bottom: var(--spacing-sm);
    }

    .flow__content {
        text-align: center;
    }

    .flow__item:not(:last-child)::after {
        left: 50%;
        transform: translateX(-50%);
        bottom: -24px;
        height: 24px;
        width: 2px;
    }
}