/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #f59e0b;
    --success: #10b981;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #cbd5e1;
    --gray-lighter: #f1f5f9;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ===========================
   Typography
   =========================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }

.lead {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 2rem;
}

.jp-text {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 500;
    color: var(--primary);
}

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

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-lg);
}

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

.btn-white {
    background: var(--white);
    color: var(--primary);
    box-shadow: var(--shadow-lg);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-image {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    object-fit: cover;
}

.logo-icon {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--dark);
    font-weight: 500;
    position: relative;
}

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

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

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--dark);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    position: relative;
    padding: 140px 0 80px;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.hero-bg-gradient {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: var(--gradient-hero);
    opacity: 0.1;
    border-radius: 50%;
    filter: blur(100px);
    z-index: 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--dark);
    font-weight: 500;
}

.hero-feature i {
    color: var(--success);
    font-size: 1.25rem;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cta-note {
    color: var(--gray);
    font-size: 0.875rem;
}

/* Phone Mockup */
.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    background: var(--dark);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
    margin: 0 auto;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--white);
    border-radius: 32px;
    overflow: hidden;
}

.app-preview {
    padding: 2rem 1.5rem;
}

.preview-header {
    text-align: center;
    margin-bottom: 2rem;
}

.preview-title {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--dark);
}

.preview-question {
    background: var(--gray-lighter);
    padding: 1.5rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
}

.question-text {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.particle-blank {
    color: var(--primary);
    font-weight: 700;
}

.question-translation {
    font-size: 0.875rem;
    color: var(--gray);
}

.preview-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.option-btn {
    font-family: 'Noto Sans JP', sans-serif;
    padding: 1rem;
    background: var(--white);
    border: 2px solid var(--gray-light);
    border-radius: var(--radius);
    font-size: 1.25rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.option-btn:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--white);
}

/* ===========================
   Problem Section
   =========================== */
.problem-section {
    padding: 80px 0;
    background: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-label {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.problem-card {
    text-align: center;
    padding: 2rem;
    background: var(--gray-lighter);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.problem-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.problem-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.problem-card h3 {
    margin-bottom: 1rem;
    color: var(--dark);
}

.problem-card p {
    color: var(--gray);
}

/* ===========================
   Solution Section
   =========================== */
.solution-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.solution-section .section-label {
    background: rgba(255, 255, 255, 0.2);
}

.solution-section h2 {
    color: var(--white);
}

.solution-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.solution-list li {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.solution-list i {
    font-size: 1.5rem;
    color: var(--accent);
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.solution-list strong {
    display: block;
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.solution-list p {
    color: rgba(255, 255, 255, 0.9);
}

.feature-showcase {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.showcase-item {
    text-align: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.showcase-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.showcase-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
}

/* ===========================
   Features Section
   =========================== */
.features-section {
    padding: 80px 0;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    background: var(--white);
    border: 2px solid var(--gray-lighter);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon i {
    font-size: 1.5rem;
    color: var(--white);
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
}

/* ===========================
   How It Works Section
   =========================== */
.how-it-works-section {
    padding: 80px 0;
    background: var(--gray-lighter);
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.step {
    flex: 1;
    text-align: center;
}

.step-number {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 800;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-lg);
}

.step-content h3 {
    margin-bottom: 0.75rem;
    color: var(--dark);
}

.step-content p {
    color: var(--gray);
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--gray-light);
    position: relative;
}

.step-connector::after {
    content: '→';
    position: absolute;
    right: -10px;
    top: -10px;
    color: var(--gray-light);
    font-size: 1.5rem;
}

/* ===========================
   Particles Section
   =========================== */
.particles-section {
    padding: 80px 0;
    background: var(--white);
}

.particles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.particle-item {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    padding: 2rem;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.particle-item:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-xl);
}

.particles-note {
    text-align: center;
    color: var(--gray);
    font-size: 1.125rem;
}

/* ===========================
   Testimonials Section
   =========================== */
.testimonials-section {
    padding: 80px 0;
    background: var(--gray-lighter);
}

.rating-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

.stars {
    color: var(--accent);
    font-size: 1.5rem;
}

.rating-text {
    color: var(--gray);
    font-size: 1rem;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.testimonial-stars {
    color: var(--accent);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.testimonial-text {
    color: var(--dark);
    font-size: 1.125rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.testimonial-author strong {
    display: block;
    color: var(--dark);
    margin-bottom: 0.25rem;
}

.testimonial-author span {
    color: var(--gray);
    font-size: 0.875rem;
}

/* ===========================
   Comparison Section
   =========================== */
.comparison-section {
    padding: 80px 0;
    background: var(--white);
}

.comparison-table {
    max-width: 800px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.comparison-header,
.comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    border-bottom: 1px solid var(--gray-lighter);
}

.comparison-header {
    background: var(--dark);
    color: var(--white);
    font-weight: 600;
}

.comparison-cell {
    padding: 1.5rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.comparison-cell.feature-name {
    text-align: left;
    justify-content: flex-start;
    font-weight: 500;
}

.comparison-cell.highlight {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    font-weight: 600;
}

.comparison-cell i.fa-check {
    color: var(--success);
    font-size: 1.5rem;
}

.comparison-cell i.fa-times {
    color: var(--gray-light);
    font-size: 1.5rem;
}

/* ===========================
   FAQ Section
   =========================== */
.faq-section {
    padding: 80px 0;
    background: var(--gray-lighter);
}

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

.faq-item {
    background: var(--white);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--dark);
    text-align: left;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--gray-lighter);
}

.faq-question i {
    color: var(--primary);
    transition: var(--transition);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--gray);
    line-height: 1.6;
}

.faq-answer a {
    color: var(--primary);
    text-decoration: underline;
}

/* ===========================
   CTA Section
   =========================== */
.cta-section {
    padding: 100px 0;
    background: var(--gradient-hero);
    color: var(--white);
    text-align: center;
}

.cta-content h2 {
    color: var(--white);
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

.cta-guarantee {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 1rem;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.footer-logo .logo-image {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
}

.footer-logo .logo-text {
    font-weight: 700;
    font-size: 1.25rem;
}

.footer-brand p {
    color: var(--gray-light);
    margin-top: 1rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    color: var(--gray-light);
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--dark-light);
    color: var(--gray-light);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 968px) {
    .hero-content,
    .solution-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .phone-mockup {
        max-width: 280px;
    }

    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .steps-container {
        flex-direction: column;
    }

    .step-connector {
        width: 2px;
        height: 60px;
        transform: rotate(90deg);
    }

    .comparison-header,
    .comparison-row {
        grid-template-columns: 1.5fr 1fr 1fr;
    }

    .comparison-cell {
        padding: 1rem;
        font-size: 0.875rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

@media (max-width: 640px) {
    .hero {
        padding: 120px 0 60px;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }

    .hero-features {
        flex-direction: column;
        gap: 1rem;
    }

    .feature-showcase {
        grid-template-columns: 1fr;
    }

    .particles-grid {
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
        gap: 1rem;
    }

    .particle-item {
        font-size: 2rem;
        padding: 1.5rem;
    }

    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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