/* ========================================
   CENTLIX - Minimal Black & White
   ======================================== */

:root {
    --color-bg: #ffffff;
    --color-bg-alt: #fafafa;
    --color-text: #0a0a0a;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-border: #e5e5e5;
    --color-border-dark: #d0d0d0;
    
    --font-display: 'Sora', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
    
    --section-padding: 120px;
    --container-max: 1000px;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

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

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

ul, ol {
    list-style: none;
}

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

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ========================================
   Container & Layout
   ======================================== */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    margin-bottom: 48px;
}

.section-label {
    display: block;
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(24px, 4vw, 32px);
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: -0.02em;
}

.section-lead {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-top: 12px;
}

/* ========================================
   Navigation
   ======================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.nav.scrolled {
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

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

.logo-text {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 0.05em;
}

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

.nav-links a {
    font-size: 13px;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    padding: 8px 20px !important;
    background: var(--color-text) !important;
    color: var(--color-bg) !important;
    border-radius: 4px;
    font-weight: 500 !important;
}

.nav-cta:hover {
    opacity: 0.85;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.nav-toggle span {
    width: 20px;
    height: 1.5px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    z-index: 999;
    padding: 100px 24px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

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

.mobile-menu-links {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mobile-menu-links a {
    font-size: 20px;
    font-weight: 500;
}

.mobile-cta {
    display: inline-block;
    margin-top: 24px;
    padding: 14px 28px;
    background: var(--color-text);
    color: var(--color-bg) !important;
    border-radius: 4px;
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 140px 24px 100px;
}

.hero-bg {
    display: none;
}

.hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    width: 100%;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.badge-dot {
    display: none;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(32px, 6vw, 56px);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 32px;
}

.title-main {
    display: block;
}

.title-accent {
    display: block;
}

.hero-description {
    font-size: clamp(15px, 2vw, 17px);
    color: var(--color-text-secondary);
    max-width: 540px;
    margin-bottom: 12px;
}

.hero-sub {
    font-size: 14px;
    color: var(--color-text-muted);
    max-width: 540px;
    margin-bottom: 40px;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-text);
    color: var(--color-bg);
}

.btn-primary:hover {
    opacity: 0.85;
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border-dark);
}

.btn-secondary:hover {
    background: var(--color-bg-alt);
}

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

.hero-scroll {
    display: none;
}

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

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

.problems-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--color-border);
    border: 1px solid var(--color-border);
    margin-bottom: 48px;
}

.problem-card {
    padding: 32px;
    background: var(--color-bg);
}

.problem-icon {
    display: none;
}

.problem-card h3 {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
}

.problem-card p {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.problems-solution {
    padding: 32px;
    border-left: 2px solid var(--color-text);
    background: var(--color-bg);
}

.solution-text p {
    font-size: 15px;
    color: var(--color-text-secondary);
}

.solution-text strong {
    color: var(--color-text);
    font-weight: 600;
}

/* ========================================
   Services Section
   ======================================== */

.services {
    padding: var(--section-padding) 0;
}

.services-list {
    display: flex;
    flex-direction: column;
}

.service-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 32px;
    padding: 48px 0;
    border-bottom: 1px solid var(--color-border);
}

.service-item:first-child {
    padding-top: 0;
}

.service-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.service-number {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-muted);
}

.service-title {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.service-description {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.service-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
    margin-bottom: 20px;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.service-features svg {
    width: 14px;
    height: 14px;
    color: var(--color-text);
}

.service-goal {
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

.goal-label {
    display: block;
    font-size: 11px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 4px;
}

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

.goal-text strong {
    color: var(--color-text);
}

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

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--color-border);
    border: 1px solid var(--color-border);
}

.feature-card {
    padding: 40px 32px;
    background: var(--color-bg);
}

.feature-icon {
    display: none;
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ========================================
   Target Section
   ======================================== */

.target {
    padding: var(--section-padding) 0;
}

.target-list {
    max-width: 600px;
}

.target-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
}

.target-item:last-child {
    border-bottom: none;
}

.target-check {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.target-check svg {
    width: 16px;
    height: 16px;
}

.target-item p {
    font-size: 14px;
}

.target-note {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: 24px;
}

/* ========================================
   Mission Section
   ======================================== */

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

.mission .section-label {
    color: rgba(255, 255, 255, 0.5);
}

.mission-content {
    max-width: 600px;
}

.mission-title {
    font-family: var(--font-display);
    font-size: clamp(24px, 4vw, 32px);
    font-weight: 600;
    margin-bottom: 32px;
    letter-spacing: -0.02em;
}

.mission-text p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
}

.mission-highlight {
    font-size: 16px !important;
    color: var(--color-bg) !important;
}

.mission-highlight strong {
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

/* ========================================
   Contact Section
   ======================================== */

.contact {
    padding: var(--section-padding) 0;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
}

.contact-title {
    font-family: var(--font-display);
    font-size: clamp(24px, 4vw, 32px);
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.contact-description {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.contact-tagline {
    padding: 20px;
    border-left: 2px solid var(--color-text);
    background: var(--color-bg-alt);
}

.contact-tagline p {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.strike {
    text-decoration: line-through;
    opacity: 0.5;
}

.tagline-highlight {
    font-size: 16px !important;
    font-weight: 600;
    color: var(--color-text) !important;
    margin-top: 4px;
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--color-bg-alt);
    padding: 32px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
    padding: 12px 14px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-text);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

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

.footer {
    padding: 48px 0 32px;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
}

.footer-tagline {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 13px;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 12px;
    color: var(--color-text-muted);
}

/* ========================================
   Animations
   ======================================== */

[data-animate] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

[data-animate].animated {
    opacity: 1;
    transform: translateY(0);
}

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

@media (max-width: 900px) {
    :root {
        --section-padding: 80px;
    }
    
    .service-item {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(4px, 4px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(4px, -4px);
    }
    
    .hero {
        padding: 120px 24px 80px;
        min-height: auto;
    }
    
    .problems-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 24px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px 20px;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .contact-form-wrapper {
        padding: 24px;
    }
}