/* ===================================
   価格耐性デザイン専門LP - メインスタイル
   
   デザイン原則:
   - 余白を戦略的に活用（画面の70%）
   - 8pxベースのスケール
   - 洗練されたタイポグラフィ
   - ミニマルで高級感のある表現
   =================================== */

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

:root {
    /* Color Palette */
    --color-white: #FFFFFF;
    --color-black: #111111;
    --color-gold: #C8A96A;
    --color-light-gray: #F8F9FA;
    --color-medium-gray: #6C757D;
    --color-border: #E0E0E0;
    
    /* Spacing Scale (8px base) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
    --space-3xl: 96px;
    --space-4xl: 128px;
    
    /* Typography */
    --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Noto Sans JP', sans-serif;
    
    /* Font Sizes */
    --font-size-h1: 56px;
    --font-size-h2: 40px;
    --font-size-h3: 28px;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    
    /* Line Heights */
    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;
    --line-height-loose: 2.0;
    
    /* Container */
    --container-width: 1140px;
    
    /* Transitions */
    --transition-base: all 0.3s ease;
    --transition-slow: all 0.5s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-black);
    background-color: var(--color-white);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-md);
}

h1 {
    font-size: var(--font-size-h1);
}

h2 {
    font-size: var(--font-size-h2);
}

h3 {
    font-size: var(--font-size-h3);
}

p {
    margin-bottom: var(--space-md);
}

strong {
    font-weight: 700;
    color: var(--color-gold);
}

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

a:hover {
    color: var(--color-gold);
}

/* ===================================
   Layout
   =================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

section {
    padding: var(--space-4xl) 0;
}

/* Responsive Helpers */
.sp-only {
    display: none;
}

/* ===================================
   Hero Section
   =================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-4xl) 0;
    background: linear-gradient(to bottom, var(--color-white) 0%, var(--color-light-gray) 100%);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(40px, 6vw, var(--font-size-h1));
    margin-bottom: var(--space-xl);
    letter-spacing: 0.02em;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    line-height: var(--line-height-loose);
    margin-bottom: var(--space-3xl);
    color: var(--color-medium-gray);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

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

.stat-number {
    font-family: var(--font-serif);
    font-size: 48px;
    font-weight: 700;
    color: var(--color-gold);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-medium-gray);
    letter-spacing: 0.05em;
}

/* ===================================
   CTA Buttons
   =================================== */
.cta-button {
    display: inline-block;
    padding: var(--space-lg) var(--space-3xl);
    background-color: var(--color-gold);
    color: var(--color-white);
    font-size: 20px;
    font-weight: 600;
    text-align: center;
    border-radius: 4px;
    transition: var(--transition-base);
    box-shadow: 0 4px 20px rgba(200, 169, 106, 0.3);
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    background-color: #B39758;
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(200, 169, 106, 0.4);
    color: var(--color-white);
}

.cta-subtext {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 400;
    margin-top: var(--space-xs);
    opacity: 0.9;
}

/* ===================================
   Section Titles
   =================================== */
.section-title {
    text-align: center;
    margin-bottom: var(--space-lg);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-gold);
    margin: var(--space-md) auto 0;
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: var(--color-medium-gray);
    margin-bottom: var(--space-3xl);
}

/* ===================================
   Problem Section
   =================================== */
.problem-section {
    background-color: var(--color-white);
}

.problem-list {
    max-width: 800px;
    margin: 0 auto var(--space-3xl);
}

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

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

.problem-item i {
    color: var(--color-gold);
    font-size: 24px;
    flex-shrink: 0;
    margin-top: 4px;
}

.problem-item p {
    font-size: 18px;
    line-height: var(--line-height-relaxed);
    margin-bottom: 0;
}

.problem-insight {
    max-width: 700px;
    margin: var(--space-3xl) auto 0;
    text-align: center;
    padding: var(--space-3xl);
    background-color: var(--color-light-gray);
    border-radius: 8px;
}

.insight-text {
    font-size: 20px;
    line-height: var(--line-height-loose);
    margin-bottom: var(--space-md);
}

.insight-highlight {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-gold);
    margin-bottom: 0;
}

/* ===================================
   Solution Section (PREMIUM)
   =================================== */
.solution-section {
    background-color: var(--color-light-gray);
}

.premium-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
    margin-top: var(--space-3xl);
}

.premium-item {
    background-color: var(--color-white);
    padding: var(--space-xl);
    border-radius: 8px;
    transition: var(--transition-base);
}

.premium-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.premium-letter {
    width: 80px;
    height: 80px;
    background-color: var(--color-gold);
    color: var(--color-white);
    font-family: var(--font-serif);
    font-size: 48px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin-bottom: var(--space-md);
}

.premium-title {
    font-size: 22px;
    margin-bottom: var(--space-xs);
    color: var(--color-black);
}

.premium-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-gold);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.premium-description {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-medium-gray);
}

/* ===================================
   Case Studies Section
   =================================== */
.cases-section {
    background-color: var(--color-white);
}

.case-list {
    max-width: 1000px;
    margin: 0 auto;
}

.case-item {
    background-color: var(--color-light-gray);
    border-radius: 8px;
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
    transition: var(--transition-base);
}

.case-item:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.case-header {
    margin-bottom: var(--space-lg);
}

.case-badge {
    display: inline-block;
    background-color: var(--color-gold);
    color: var(--color-white);
    padding: var(--space-xs) var(--space-md);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.case-title {
    font-size: 24px;
    color: var(--color-black);
}

.case-content {
    display: grid;
    gap: var(--space-lg);
}

.case-challenge h4,
.case-solution h4,
.case-results h4 {
    font-family: var(--font-sans);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.case-challenge i {
    color: #E74C3C;
}

.case-solution i {
    color: #F39C12;
}

.case-results i {
    color: #27AE60;
}

.case-results ul {
    list-style: none;
    padding-left: 0;
}

.case-results li {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.case-results li:last-child {
    border-bottom: none;
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-3xl);
}

.service-card {
    background-color: var(--color-white);
    border-radius: 8px;
    padding: var(--space-xl);
    position: relative;
    transition: var(--transition-base);
    border: 2px solid transparent;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.service-card.featured {
    border-color: var(--color-gold);
    box-shadow: 0 10px 30px rgba(200, 169, 106, 0.2);
}

.service-badge {
    position: absolute;
    top: -16px;
    right: var(--space-lg);
    background-color: var(--color-gold);
    color: var(--color-white);
    padding: var(--space-xs) var(--space-md);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.service-step {
    font-size: var(--font-size-sm);
    color: var(--color-medium-gray);
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.service-title {
    font-size: 24px;
    margin-bottom: var(--space-xs);
    min-height: 60px;
}

.service-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-gold);
    margin-bottom: var(--space-lg);
}

.service-price {
    text-align: center;
    margin-bottom: var(--space-md);
}

.price-amount {
    font-family: var(--font-serif);
    font-size: 48px;
    font-weight: 700;
    color: var(--color-gold);
}

.price-unit {
    font-size: 18px;
    color: var(--color-medium-gray);
    margin-left: var(--space-xs);
}

.service-duration {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-medium-gray);
    margin-bottom: var(--space-lg);
}

.service-features {
    list-style: none;
    margin-bottom: var(--space-xl);
}

.service-features li {
    padding: var(--space-sm) 0;
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
}

.service-features i {
    color: var(--color-gold);
    margin-top: 4px;
    flex-shrink: 0;
}

.service-cta {
    display: block;
    width: 100%;
    padding: var(--space-md);
    background-color: var(--color-gold);
    color: var(--color-white);
    text-align: center;
    border-radius: 4px;
    font-weight: 600;
    transition: var(--transition-base);
}

.service-cta:hover {
    background-color: #B39758;
    color: var(--color-white);
}

/* ===================================
   Testimonials Section
   =================================== */
.testimonials-section {
    background-color: var(--color-white);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-3xl);
}

.testimonial-card {
    background-color: var(--color-light-gray);
    border-radius: 8px;
    padding: var(--space-xl);
    transition: var(--transition-base);
}

.testimonial-card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.testimonial-content {
    margin-bottom: var(--space-lg);
}

.testimonial-text {
    font-size: 16px;
    line-height: var(--line-height-loose);
    font-style: italic;
    color: var(--color-medium-gray);
}

.testimonial-text::before {
    content: '"';
    font-size: 48px;
    color: var(--color-gold);
    line-height: 0;
    display: block;
    margin-bottom: var(--space-sm);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.author-name {
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.author-title {
    font-size: var(--font-size-sm);
    color: var(--color-medium-gray);
    margin-bottom: 0;
}

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

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

.faq-item {
    background-color: var(--color-white);
    border-radius: 8px;
    margin-bottom: var(--space-md);
    overflow: hidden;
}

.faq-question {
    padding: var(--space-lg);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    transition: var(--transition-base);
}

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

.faq-question h3 {
    font-size: 18px;
    margin-bottom: 0;
    font-family: var(--font-sans);
    font-weight: 600;
}

.faq-question i {
    color: var(--color-gold);
    transition: var(--transition-base);
    font-size: 20px;
}

.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 var(--space-lg) var(--space-lg);
    color: var(--color-medium-gray);
    line-height: var(--line-height-relaxed);
}

/* ===================================
   Urgency Section
   =================================== */
.urgency-section {
    background-color: var(--color-black);
    color: var(--color-white);
    text-align: center;
    padding: var(--space-3xl) 0;
}

.urgency-title {
    color: var(--color-white);
    margin-bottom: var(--space-md);
}

.urgency-title::after {
    background-color: var(--color-gold);
}

.urgency-text {
    font-size: 18px;
    line-height: var(--line-height-loose);
    margin-bottom: var(--space-lg);
    opacity: 0.9;
}

.urgency-highlight {
    font-size: 24px;
    margin-bottom: 0;
}

.urgency-highlight strong {
    font-size: 48px;
    font-family: var(--font-serif);
    display: inline-block;
    margin: 0 var(--space-sm);
}

/* ===================================
   Contact Section
   =================================== */
.contact-section {
    background-color: var(--color-white);
}

.contact-form-wrapper {
    max-width: 700px;
    margin: 0 auto;
}

.contact-form {
    background-color: var(--color-light-gray);
    padding: var(--space-3xl);
    border-radius: 8px;
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.required {
    color: #E74C3C;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    transition: var(--transition-base);
}

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

.checkbox-group label {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    font-weight: 400;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-top: 4px;
}

.privacy-link {
    color: var(--color-gold);
    text-decoration: underline;
}

.submit-button {
    width: 100%;
    padding: var(--space-lg);
    background-color: var(--color-gold);
    color: var(--color-white);
    font-size: 20px;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: 0 4px 20px rgba(200, 169, 106, 0.3);
}

.submit-button:hover {
    background-color: #B39758;
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(200, 169, 106, 0.4);
}

.button-subtext {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 400;
    margin-top: var(--space-xs);
    opacity: 0.9;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: var(--space-xl) 0;
    text-align: center;
}

.footer-copyright {
    font-size: var(--font-size-sm);
    margin-bottom: 0;
    opacity: 0.8;
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 50px;
    height: 50px;
    background-color: var(--color-gold);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    box-shadow: 0 4px 20px rgba(200, 169, 106, 0.3);
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: #B39758;
    transform: translateY(-4px);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 1s ease forwards;
    opacity: 0;
}

.fade-in:nth-child(1) { animation-delay: 0.1s; }
.fade-in:nth-child(2) { animation-delay: 0.3s; }
.fade-in:nth-child(3) { animation-delay: 0.5s; }
.fade-in:nth-child(4) { animation-delay: 0.7s; }

.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

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

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --font-size-h1: 48px;
        --font-size-h2: 36px;
        --font-size-h3: 24px;
    }
    
    .container {
        padding: 0 var(--space-md);
    }
    
    section {
        padding: var(--space-3xl) 0;
    }
    
    .hero-stats {
        gap: var(--space-xl);
    }
    
    .premium-grid,
    .services-grid,
    .testimonials-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--space-lg);
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --font-size-h1: 36px;
        --font-size-h2: 28px;
        --font-size-h3: 22px;
        --space-3xl: 64px;
        --space-4xl: 80px;
    }
    
    .hero-section {
        min-height: auto;
        padding: var(--space-3xl) 0;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .cta-button {
        font-size: 18px;
        padding: var(--space-md) var(--space-xl);
    }
    
    .premium-grid,
    .services-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .case-item {
        padding: var(--space-lg);
    }
    
    .contact-form {
        padding: var(--space-lg);
    }
    
    .back-to-top {
        bottom: var(--space-md);
        right: var(--space-md);
        width: 45px;
        height: 45px;
    }
    
    .problem-item {
        flex-direction: column;
    }
    
    .urgency-highlight strong {
        font-size: 36px;
        display: block;
        margin: var(--space-sm) 0;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    :root {
        --font-size-h1: 24px;
        --font-size-h2: 24px;
        --font-size-h3: 20px;
    }
    
    .hero-title {
        margin-bottom: var(--space-lg);
        font-size: clamp(20px, 5.5vw, 28px);
        line-height: 1.3;
        letter-spacing: 0;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .sp-only {
        display: inline;
    }
    
    .price-amount {
        font-size: 36px;
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .back-to-top,
    .cta-button,
    .service-cta,
    .submit-button {
        display: none;
    }
    
    * {
        background: white !important;
        color: black !important;
    }
}