/* ===== CSS Variables ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #0ea5e9;
    --accent: #f472b6;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f1f5f9;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', 'Poppins', sans-serif;
    background-color: var(--dark);
    color: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* ===== Utility Classes ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-large {
    padding: 18px 40px;
    font-size: 1.1rem;
    gap: 12px;
}

.btn-icon {
    font-size: 1.3rem;
}

.form-cta {
    margin-bottom: 48px;
}

.sp-hide {
    display: inline;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.nav.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    padding: 12px 0;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--gray-light);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: var(--transition);
}

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

.nav-links a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
}

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

.hero-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(14, 165, 233, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 50%, rgba(244, 114, 182, 0.05) 0%, transparent 50%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 24px;
}

.hero-tagline {
    font-size: 1rem;
    color: var(--primary-light);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
    font-weight: 500;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--gray-light);
    margin-bottom: 40px;
    line-height: 1.8;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--gray);
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--gray), transparent);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0%, 100% { opacity: 0; transform: scaleY(0); transform-origin: top; }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ===== Section Styles ===== */
section {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    font-size: 0.85rem;
    color: var(--primary-light);
    letter-spacing: 3px;
    text-transform: uppercase;
    font-weight: 600;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-top: 12px;
}

/* ===== Story Section ===== */
.story {
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark-light) 100%);
}

.story-timeline {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}

.story-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary), var(--accent));
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    padding-bottom: 48px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: 12px;
    top: 4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--dark-light);
    border: 3px solid var(--primary);
    z-index: 1;
}

.timeline-content {
    background: rgba(30, 41, 59, 0.5);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: rgba(99, 102, 241, 0.5);
    transform: translateX(5px);
}

.timeline-label {
    font-size: 0.75rem;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
}

.timeline-content h3 {
    font-size: 1.25rem;
    margin: 8px 0 12px;
}

.timeline-content p {
    color: var(--gray-light);
    font-size: 0.95rem;
}

/* ===== Services Section ===== */
.services {
    background: var(--dark-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.service-card {
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.8));
    padding: 40px;
    border-radius: var(--radius);
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.15);
}

.service-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.service-icon svg {
    width: 32px;
    height: 32px;
    color: var(--white);
}

.service-card h3 {
    font-size: 1.35rem;
    margin-bottom: 16px;
}

.service-card > p {
    color: var(--gray-light);
    margin-bottom: 24px;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--gray-light);
}

.service-features li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    flex-shrink: 0;
}

/* ===== Product Section ===== */
.product {
    background: linear-gradient(180deg, var(--dark-light) 0%, var(--dark) 100%);
}

.product-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.product-visual {
    display: flex;
    justify-content: center;
}

.product-mockup {
    width: 100%;
    max-width: 400px;
    background: var(--dark-light);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

/* Screenshots slider */
.product-screenshots {
    width: 100%;
    max-width: 520px;
}

.screenshots-slider {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(99, 102, 241, 0.3);
    background: var(--dark-light);
}

.screenshot-slide {
    display: none;
    flex-direction: column;
}

.screenshot-slide.active {
    display: flex;
}

.screenshot-img-wrapper {
    overflow: hidden;
    line-height: 0;
}

.screenshot-slide img {
    width: 100%;
    height: auto;
    display: block;
}

.screenshot-caption {
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray-light);
    padding: 10px 16px;
    margin: 0;
    background: rgba(15, 23, 42, 0.8);
    border-top: 1px solid rgba(99, 102, 241, 0.2);
}

.screenshots-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
}

.dot-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(99, 102, 241, 0.3);
    cursor: pointer;
    transition: var(--transition);
}

.dot-indicator.active {
    background: var(--primary);
    transform: scale(1.2);
}

.mockup-header {
    display: flex;
    gap: 8px;
    padding: 16px;
    background: rgba(15, 23, 42, 0.8);
    border-bottom: 1px solid rgba(99, 102, 241, 0.2);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #22c55e; }

.mockup-content {
    display: flex;
    padding: 16px;
    gap: 16px;
    min-height: 250px;
}

.mockup-sidebar {
    width: 60px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-item {
    height: 40px;
    background: rgba(99, 102, 241, 0.2);
    border-radius: 8px;
    transition: var(--transition);
}

.sidebar-item.active {
    background: var(--gradient);
}

.mockup-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mockup-block {
    height: 60px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 8px;
    border: 1px dashed rgba(99, 102, 241, 0.3);
}

.mockup-block.small {
    height: 40px;
}

.product-info {
    padding: 20px 0;
}

.product-concept {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 32px;
    color: var(--gray-light);
}

.product-concept strong {
    color: var(--white);
}

.product-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.product-features li {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 1.05rem;
}

.feature-icon {
    font-size: 1.5rem;
}

.product-tagline {
    font-size: 1rem;
    color: var(--primary-light);
    font-weight: 500;
}

/* ===== FAQ Section ===== */
.faq {
    background: var(--dark-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(99, 102, 241, 0.4);
}

.faq-item[open] {
    border-color: var(--primary);
}

.faq-item summary {
    padding: 20px 24px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    list-style: none;
    transition: var(--transition);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item summary:hover {
    color: var(--primary-light);
}

.faq-answer {
    padding: 0 24px 20px;
    color: var(--gray-light);
    line-height: 1.8;
}

.faq-answer p {
    margin: 0;
}

/* ===== Skip Link (Accessibility) ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: var(--white);
    padding: 12px 24px;
    border-radius: var(--radius);
    z-index: 9999;
    transition: var(--transition);
}

.skip-link:focus {
    top: 20px;
}

/* ===== Contact Section ===== */
.contact {
    background: var(--dark);
    text-align: center;
}

.contact-description {
    color: var(--gray-light);
    margin-bottom: 48px;
    font-size: 1.1rem;
}

.social-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.social-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 32px 24px;
    background: rgba(30, 41, 59, 0.5);
    border-radius: var(--radius);
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: var(--transition);
}

.social-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    background: rgba(30, 41, 59, 0.8);
}

.social-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.x-icon {
    background: var(--white);
    color: var(--dark);
}

.note-icon {
    background: #41c9b4;
}

.youtube-icon {
    background: #ff0000;
    color: var(--white);
}

.social-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.social-handle {
    color: var(--gray);
    font-size: 0.9rem;
}

/* ===== Footer ===== */
.footer {
    background: var(--dark-light);
    padding: 32px 0;
    text-align: center;
}

.footer-text {
    color: var(--gray);
    font-size: 0.9rem;
}

/* ===== Animations ===== */
[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .product-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .product-visual {
        width: 100%;
        order: -1;
    }
}

@media (max-width: 768px) {
    .product-screenshots {
        width: 100%;
        max-width: 100%;
    }

    .screenshots-slider {
        width: 100%;
    }

    .screenshot-slide {
        display: none;
        width: 100%;
    }

    .screenshot-slide.active {
        display: block;
    }

    .screenshot-slide img {
        width: 100%;
        height: auto;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--dark-light);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        transition: var(--transition);
    }

    .nav-links.active {
        right: 0;
    }

    .hamburger {
        display: flex;
        z-index: 1001;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    section {
        padding: 80px 0;
    }

    .sp-hide {
        display: none;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .social-links {
        grid-template-columns: 1fr 1fr;
    }

    .story-timeline::before {
        left: 15px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-marker {
        left: 7px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

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

    .social-links {
        grid-template-columns: 1fr;
    }

    .service-card {
        padding: 28px;
    }

    .timeline-content {
        padding: 20px;
    }
}