:root {
    --color-primary: #FDD606;
    --color-black: #111111;
    --color-white: #FFFFFF;
    --color-gray: #F5F5F7;
    --font-main: 'Noto Sans JP', sans-serif;
}

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

body {
    font-family: var(--font-main);
    color: var(--color-black);
    background-color: var(--color-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Utilities */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 700;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.btn:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-black) 0%, #333 100%);
    color: var(--color-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-large {
    padding: 18px 48px;
    font-size: 1.2rem;
    letter-spacing: 0.05em;
}

/* Animations */
@keyframes float {
    0% {
        transform: translateY(0px) rotate(-3deg);
    }

    50% {
        transform: translateY(-15px) rotate(-2deg);
    }

    100% {
        transform: translateY(0px) rotate(-3deg);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.215, 0.610, 0.355, 1.000),
        transform 0.8s cubic-bezier(0.215, 0.610, 0.355, 1.000);
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-100 {
    transition-delay: 0.1s;
}

.delay-200 {
    transition-delay: 0.2s;
}

.delay-300 {
    transition-delay: 0.3s;
}


/* Header */
.header {
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.logo-text {
    font-weight: 900;
    font-size: 1.2rem;
}

/* Hero */
.hero {
    padding-top: 120px;
    padding-bottom: 60px;
    background-color: var(--color-white);
    overflow: hidden;
}

.hero-container {
    display: flex;
    align-items: center;
    gap: 40px;
    flex-direction: column-reverse;
    /* Mobile First */
}

.hero-content {
    text-align: center;
    max-width: 600px;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: 20px;
}

.hero-title .highlight {
    background: linear-gradient(transparent 60%, var(--color-primary) 60%);
    padding: 0 5px;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 40px;
}

.hero-image {
    width: 100%;
    max-width: 400px;
    border-radius: 40px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.2);
    transform: rotate(-3deg);
    /* Floating animation */
    animation: float 6s ease-in-out infinite;
    transition: transform 0.5s;
}

.hero-image:hover {
    transform: rotate(0deg) scale(1.02);
}

/* Problem */
.problem {
    background-color: var(--color-gray);
    padding: 60px 0;
    text-align: center;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 900;
    margin-bottom: 40px;
}

.problem-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

.problem-item {
    background: white;
    padding: 20px 30px;
    border-radius: 20px;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

/* Features */
.feature {
    padding: 100px 0;
}

.feature-yellow {
    background-color: var(--color-primary);
}

.feature-black {
    background-color: var(--color-black);
    color: white;
}

.feature-container {
    display: flex;
    align-items: center;
    gap: 60px;
    flex-direction: column;
    /* Mobile */
}

.feature-image img {
    max-width: 320px;
    border-radius: 30px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.feature-content {
    text-align: center;
    max-width: 500px;
}

.feature-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 20px;
    line-height: 1.2;
}

.feature-desc {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Footer */
.footer {
    padding: 80px 0 40px;
    background-color: white;
    text-align: center;
}

.footer-title {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 10px;
}

.footer-cta {
    margin-bottom: 60px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
    color: #666;
    font-size: 0.9rem;
}

.copyright {
    color: #999;
    font-size: 0.8rem;
}

/* Desktop Styles */
@media (min-width: 768px) {
    .hero-container {
        flex-direction: row;
        justify-content: space-between;
    }

    .hero-content {
        text-align: left;
    }

    .feature-container {
        flex-direction: row;
    }

    .feature-container.reverse {
        flex-direction: row-reverse;
    }

    .feature-content {
        text-align: left;
    }

    .hero-title {
        font-size: 3.5rem;
    }
}