/* ==========================================================================
   BizFlow - BtoB SaaS Landing Page Styles
   ========================================================================== */

/* Reset & Base Styles
   ========================================================================== */

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

:root {
    /* Colors */
    --primary-color: #0066CC;
    --primary-dark: #0052A3;
    --primary-light: #3385D6;
    --accent-color: #FF6B35;
    --accent-dark: #E5612F;
    --accent-light: #FF8557;
    
    --bg-color: #FFFFFF;
    --bg-light: #F8F9FA;
    --bg-dark: #E9ECEF;
    
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --text-white: #FFFFFF;
    
    --border-color: #DEE2E6;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* Typography */
    --font-primary: 'Noto Sans JP', sans-serif;
    --font-number: 'Inter', 'Noto Sans JP', sans-serif;
    
    /* Spacing */
    --section-padding: 120px;
    --container-padding: 60px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 16px;
    background-color: var(--bg-color);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px;
}

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

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

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

/* Utility Classes
   ========================================================================== */

.highlight {
    color: var(--accent-color);
    font-weight: 700;
}

.section-title {
    font-size: 42px;
    font-weight: 900;
    text-align: center;
    margin-bottom: 20px;
    line-height: 1.4;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 60px;
    line-height: 1.8;
}

/* Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.btn i {
    font-size: 18px;
}

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

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

.btn-secondary {
    background: var(--text-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--text-white);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--text-white);
}

.btn-large {
    padding: 18px 40px;
    font-size: 18px;
}

.btn-cta {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
    color: var(--text-white);
    padding: 20px 50px;
    font-size: 20px;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
}

.btn-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(255, 107, 53, 0.4);
}

/* Header
   ========================================================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(255, 255, 255, 1);
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 900;
    color: var(--primary-color);
}

.logo i {
    font-size: 32px;
}

/* Hero Section
   ========================================================================== */

.hero {
    padding: 180px 0 100px;
    background: linear-gradient(135deg, #F0F7FF 0%, #FFFFFF 100%);
    position: relative;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-badges {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.badge {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 14px;
}

.badge i {
    color: var(--accent-color);
    font-size: 20px;
}

.badge strong {
    color: var(--primary-color);
    font-weight: 700;
}

.hero-image {
    position: relative;
    animation: floatAnimation 6s ease-in-out infinite;
}

.hero-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

@keyframes floatAnimation {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.scroll-indicator {
    text-align: center;
    margin-top: 60px;
}

.scroll-indicator a {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.scroll-indicator i {
    animation: bounceAnimation 2s infinite;
}

@keyframes bounceAnimation {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Problems Section
   ========================================================================== */

.problems {
    padding: var(--section-padding) 0;
    background: var(--bg-light);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.problem-card {
    background: var(--text-white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.problem-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.problem-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 50%;
    color: var(--text-white);
    font-size: 36px;
}

.problem-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.5;
}

.problem-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* Solution Section
   ========================================================================== */

.solution {
    padding: var(--section-padding) 0;
    text-align: center;
}

.solution-image {
    margin: 60px 0;
    position: relative;
}

.solution-image img {
    margin: 0 auto;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    max-width: 900px;
    width: 100%;
    height: auto;
}

.solution-cta {
    margin-top: 40px;
}

/* Features Section
   ========================================================================== */

.features {
    padding: var(--section-padding) 0;
    background: var(--bg-light);
}

.feature-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-top: 80px;
}

.feature-item:first-of-type {
    margin-top: 60px;
}

.feature-reverse {
    direction: rtl;
}

.feature-reverse > * {
    direction: ltr;
}

.feature-image img {
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    width: 100%;
}

.feature-number {
    font-size: 72px;
    font-weight: 900;
    font-family: var(--font-number);
    color: var(--bg-dark);
    line-height: 1;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 32px;
    font-weight: 900;
    margin-bottom: 20px;
}

.feature-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.8;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 16px;
}

.feature-list i {
    color: var(--accent-color);
    font-size: 18px;
    flex-shrink: 0;
}

/* Stats Section
   ========================================================================== */

.stats {
    padding: var(--section-padding) 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 60px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 72px;
    font-weight: 900;
    font-family: var(--font-number);
    line-height: 1;
    margin-bottom: 12px;
}

.stat-label {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 8px;
}

.stat-unit {
    font-size: 24px;
    font-weight: 700;
    font-family: var(--font-number);
}

/* Testimonials Section
   ========================================================================== */

.testimonials {
    padding: var(--section-padding) 0;
    background: var(--bg-color);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.testimonial-card {
    background: var(--text-white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.testimonial-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 16px;
}

.testimonial-logo i {
    font-size: 24px;
}

.testimonial-company {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.testimonial-stats {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.stat-badge {
    background: var(--bg-light);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.testimonial-text {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.testimonial-author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-weight: 700;
    font-size: 16px;
}

.author-position {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Pricing Section
   ========================================================================== */

.pricing {
    padding: var(--section-padding) 0;
    background: var(--bg-light);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.pricing-card {
    background: var(--text-white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.pricing-featured {
    border-color: var(--accent-color);
    transform: scale(1.05);
}

.pricing-featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.featured-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
    color: var(--text-white);
    padding: 6px 24px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.plan-name {
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 20px;
    text-align: center;
}

.plan-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: 16px;
}

.price-currency {
    font-size: 24px;
    font-weight: 700;
    font-family: var(--font-number);
}

.price-amount {
    font-size: 56px;
    font-weight: 900;
    font-family: var(--font-number);
    color: var(--primary-color);
}

.price-period {
    font-size: 18px;
    color: var(--text-secondary);
    font-family: var(--font-number);
}

.plan-description {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
    line-height: 1.6;
}

.plan-features {
    list-style: none;
    margin-bottom: 32px;
}

.plan-features li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 15px;
}

.plan-features i {
    color: var(--accent-color);
    font-size: 16px;
    margin-top: 3px;
    flex-shrink: 0;
}

.pricing-card .btn {
    width: 100%;
    justify-content: center;
}

.pricing-note {
    text-align: center;
    margin-top: 40px;
}

.pricing-note p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 8px;
}

.pricing-note i {
    color: var(--primary-color);
    margin-right: 8px;
}

/* FAQ Section
   ========================================================================== */

.faq {
    padding: var(--section-padding) 0;
    background: var(--bg-color);
}

.faq-list {
    max-width: 900px;
    margin: 60px auto 0;
}

.faq-item {
    background: var(--text-white);
    border-radius: 8px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 30px;
    text-align: left;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-question i {
    color: var(--primary-color);
    font-size: 20px;
    transition: transform var(--transition-normal);
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.faq-answer p {
    padding: 0 30px 24px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* CTA Section
   ========================================================================== */

.cta {
    padding: var(--section-padding) 0;
    background: linear-gradient(135deg, #FF6B35, #E5612F);
    color: var(--text-white);
    text-align: center;
}

.cta-title {
    font-size: 42px;
    font-weight: 900;
    margin-bottom: 16px;
}

.cta-subtitle {
    font-size: 24px;
    margin-bottom: 20px;
    opacity: 0.9;
}

.cta-description {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
    line-height: 1.8;
}

.cta-button {
    margin-bottom: 20px;
}

.cta-note {
    font-size: 14px;
    opacity: 0.8;
}

/* Footer
   ========================================================================== */

.footer {
    background: #2C3E50;
    color: var(--text-white);
    padding: 60px 0 30px;
    text-align: center;
}

.footer-content {
    margin-bottom: 40px;
}

.footer-main {
    max-width: 600px;
    margin: 0 auto;
}

.footer-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 24px;
    margin-bottom: 20px;
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 24px;
    line-height: 1.8;
    font-size: 16px;
}

.footer-social {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    font-size: 18px;
    transition: all var(--transition-normal);
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 20px;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
}

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

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

/* Animation Classes
   ========================================================================== */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Responsive Design
   ========================================================================== */

@media (max-width: 1199px) {
    :root {
        --section-padding: 80px;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .section-title {
        font-size: 36px;
    }
}

@media (max-width: 991px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-image {
        order: -1;
    }
    
    .feature-item,
    .feature-reverse {
        grid-template-columns: 1fr;
        gap: 40px;
        direction: ltr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-featured {
        transform: scale(1);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 767px) {
    :root {
        --section-padding: 60px;
    }
    
    .container {
        padding: 0 20px;
    }
    
    .header-cta .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-subtitle {
        font-size: 16px;
    }
    
    .problems-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .stat-number {
        font-size: 56px;
    }
    
    .feature-number {
        font-size: 56px;
    }
    
    .feature-title {
        font-size: 24px;
    }
    
    .cta-title {
        font-size: 32px;
    }
    
    .cta-subtitle {
        font-size: 18px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 479px) {
    .hero-title {
        font-size: 26px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }
    
    .btn-cta {
        padding: 16px 32px;
        font-size: 16px;
    }
}