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

@font-face {
    font-family: 'LINE Seed JP';
    src: url('font/WOFF2/LINESeedJP_OTF_Bd.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

body {
    font-family: 'LINE Seed JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
    background: #ffffff;
    font-weight: 700;
    letter-spacing: 0.08em;
}

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

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    transition: all 0.3s ease;
}

/* Header after scrolling past hero */
header.scrolled-past-hero {
    background: rgba(255, 255, 255, 0.55) !important;
    backdrop-filter: blur(20px) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

header.scrolled-past-hero nav a {
    color: #333;
}

header.scrolled-past-hero nav a:hover {
    color: #666;
}

header.scrolled-past-hero .logo img {
    filter: invert(80%);
}

header.scrolled-past-hero .cta-button {
    color: #333;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Desktop Header */
.header-desktop {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 60px;
}

/* Mobile Header */
.header-mobile {
    display: none;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
}

/* Menu Toggle (Hamburger) */
.menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: white;
    transition: all 0.3s ease;
}

header.scrolled-past-hero .menu-toggle span {
    background: #333;
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    padding: 120px 40px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 24px;
    text-align: center;
}

.mobile-nav-link {
    font-size: 18px;
    font-weight: 700;
    color: #333;
    text-decoration: none;
    transition: color 0.3s;
}

.mobile-nav-link:hover {
    color: #666;
}

.mobile-cta {
    width: 100%;
    max-width: 280px;
    text-align: center;
}

.logo img {
    height: 60px;
}

nav {
    display: flex;
    gap: 30px;
}

nav a {
    text-decoration: none;
    color: white;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.3s;
}

nav a:hover {
    color: rgba(255, 255, 255, 0.7);
}

.cta-button {
    display: inline-block;
    text-decoration: none;
    background: #d7ea54;
    border: none;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
    color: #000;
}

.cta-button:hover {
    background: #c5d84a;
    color: #000;
}

/* Hero Section */
.hero {
    position: relative;
    text-align: center;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 20px;
}

.hero h1 {
    font-size: 76px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 0.1em;
    color: white;
}

.hero-subtitle {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 27px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    letter-spacing: 0.05em;
}

.cta-button-hero {
    display: inline-block;
    text-decoration: none;
    background: #d7ea54;
    color: #000;
    border: none;
    padding: 16px 40px;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s;
}

.cta-button-hero:hover {
    background: #c5d84a;
    color: #000;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* Problem Section */
.problem-section {
    padding: 100px 20px;
    text-align: center;
    background: #FAFAFA;
}

.problem-section h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 30px;
}

.problem-section .section-description {
    font-size: 16px;
    line-height: 2;
    color: #666;
    max-width: 600px;
    margin: 0 auto 40px;
}

.problem-highlight {
    background: #000;
    color: white;
    padding: 30px 50px;
    border-radius: 12px;
    display: inline-block;
}

.problem-highlight p {
    font-size: 24px;
    font-weight: 700;
    margin: 0;
}

/* Daily Flow Section */
.daily-flow {
    padding: 100px 20px;
    text-align: center;
    background: white;
}

.section-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #999;
    margin-bottom: 20px;
    background: #FFF5F5;
    display: inline-block;
    padding: 8px 20px;
    border-radius: 20px;
}

.daily-flow h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 30px;
}

.section-description {
    font-size: 14px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 40px;
}

.daily-flow .section-description {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.time-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1100px;
    margin: 60px auto 0;
}

.time-card {
    text-align: left;
}

.time-card-image {
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 20px;
}

.time-card-image img {
    width: 100%;
    height: auto;
    display: block;
}

.step-label {
    display: inline-block;
    background: #f0f0f0;
    color: #333;
    font-size: 12px;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 4px;
    margin-bottom: 12px;
    letter-spacing: 0.05em;
}

.time-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: #333;
}

.time-card p {
    font-size: 14px;
    line-height: 1.8;
    color: #666;
}

/* Use Cases Section */
.use-cases {
    padding: 100px 20px;
    background: #FAFAFA;
    text-align: center;
}

.use-cases .section-label {
    display: inline-block;
}

.use-cases h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 30px;
}

.use-cases .section-description {
    max-width: 600px;
    margin: 0 auto 60px;
}

.use-case-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}

.use-case-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.use-case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.use-case-image {
    width: 100%;
    margin-bottom: 20px;
    border-radius: 12px;
    overflow: hidden;
}

.use-case-image img {
    width: 100%;
    height: auto;
    display: block;
}

.use-case-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
}

.use-case-card p {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
}

/* Power of Voice Section */
.power-voice {
    padding: 100px 20px;
    background: white;
    text-align: center;
}

.power-voice .section-label {
    display: inline-block;
}

.power-voice h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 30px;
}

.power-voice .section-description {
    max-width: 600px;
    margin: 0 auto 60px;
}

/* Voice Benefits */
.voice-benefits {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
    text-align: left;
    max-width: 1100px;
    margin: 0 auto;
}

.benefits-text {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.benefit-item {
    padding: 25px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.benefit-item:hover,
.benefit-item.active {
    background: #f9f9f9;
    border-color: #e0e0e0;
}

.benefit-item h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.benefit-item p {
    font-size: 14px;
    line-height: 1.8;
    color: #666;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    opacity: 0;
}

.benefit-item:hover p,
.benefit-item.active p {
    max-height: 200px;
    opacity: 1;
}

.brand-voice-image {
    position: sticky;
    top: 120px;
    display: flex;
    justify-content: center;
}

.brand-voice-image img {
    width: 100%;
    max-width: 280px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

/* App Features Section */
.app-features {
    padding: 100px 20px;
    background: #FAFAFA;
    text-align: center;
}

.app-features h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 30px;
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    max-width: 900px;
    margin: 60px auto 0;
}

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

.feature-image {
    background: #F5F5F5;
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 20px;
}

.feature-image img {
    width: 100%;
    max-width: 280px;
    border-radius: 12px;
}

.feature-card h4 {
    font-size: 14px;
    color: #999;
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.feature-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
}

.feature-card p {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
    margin-top: 15px;
}

/* CTA Section */
.cta-section {
    padding: 100px 20px;
    background: #333;
    text-align: center;
}

.cta-section h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
}

.cta-section .section-description {
    color: rgba(255, 255, 255, 0.8);
    max-width: 500px;
    margin: 0 auto 40px;
}

.cta-section .cta-button-hero {
    background: white;
    color: #000;
    border: none;
}

.cta-section .cta-button-hero:hover {
    background: #f0f0f0;
    color: #000;
}

/* Footer */
footer {
    padding: 80px 20px 40px;
    background: #f9f7f2;
    text-align: center;
}

.footer-logo img {
    height: 100px;
    margin-bottom: 20px;
    filter: invert(80%);
}

footer h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 5px;
}

.footer-subtitle {
    font-size: 12px;
    color: #999;
    margin-bottom: 20px;
}

footer > p {
    font-size: 14px;
    color: #666;
    margin-bottom: 30px;
}

footer .cta-button {
    margin-bottom: 40px;
}

.footer-note {
    font-size: 12px;
    color: #999;
    margin: 20px 0;
}

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

.footer-links a {
    font-size: 14px;
    color: #666;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #FF6B6B;
}

.copyright {
    font-size: 12px;
    color: #999;
    margin-top: 40px;
}

/* Responsive */
@media (max-width: 768px) {
    .header-desktop {
        display: none;
    }

    .header-mobile {
        display: flex;
    }

    .header-mobile .logo img {
        height: 40px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .problem-section h2 {
        font-size: 32px;
    }

    .daily-flow h2 {
        font-size: 32px;
    }

    .use-cases h2 {
        font-size: 32px;
    }

    .power-voice h2 {
        font-size: 32px;
    }

    .app-features h2 {
        font-size: 32px;
    }

    .problem-highlight {
        padding: 20px 30px;
    }

    .problem-highlight p {
        font-size: 18px;
    }

    .time-cards,
    .feature-cards,
    .use-case-cards {
        grid-template-columns: 1fr;
    }

    .time-card:not(:last-child) {
        margin-bottom: 40px;
    }

    .voice-benefits {
        grid-template-columns: 1fr;
    }

    .benefit-item p {
        display: block !important;
        max-height: none !important;
        opacity: 1 !important;
    }

    .brand-voice-image {
        position: relative;
        top: 0;
        order: -1;
    }

    .cta-section h2 {
        font-size: 32px;
    }

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