/* ========================================
   3Q-PAY 運用ガイド LP - スタイルシート
   ======================================== */

/* ========================================
   1. CSS Variables
   ======================================== */
:root {
    /* Colors */
    --color-navy: #2D3E6B;
    --color-green: #8BAF94;
    --color-gold: #B8A06A;
    --color-bg: #F2F2F0;
    --color-text: #1A1A1A;
    --color-white: #FFFFFF;
    --color-light-gray: #F8F8F8;
    --color-border: #E0E0E0;
    --color-warning: #D97706;
    --color-alert: #DC2626;
    
    /* Navy variations */
    --color-navy-light: rgba(45, 62, 107, 0.1);
    --color-navy-gradient-start: #2D3E6B;
    --color-navy-gradient-end: #1a2542;
    
    /* Green variations */
    --color-green-light: rgba(139, 175, 148, 0.1);
    
    /* Gold variations */
    --color-gold-light: rgba(184, 160, 106, 0.1);
    --color-gold-bg: rgba(184, 160, 106, 0.15);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-family: 'Noto Sans JP', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.75;
    
    /* Transitions */
    --transition-base: all 0.3s ease;
    --transition-fast: all 0.2s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.12);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Header Height */
    --header-height: 70px;
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    line-height: var(--line-height-base);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

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

strong {
    font-weight: 700;
}

/* ========================================
   3. Utility Classes
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.sp-only {
    display: none;
}

.pc-only {
    display: inline;
}

/* Fade In Animation */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ========================================
   4. Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-navy);
    letter-spacing: 0.05em;
}

.nav-toggle {
    display: none;
}

.nav-list {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-navy);
    background-color: var(--color-navy-light);
}

/* ========================================
   5. Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-navy-gradient-start) 0%, var(--color-navy-gradient-end) 100%);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-md);
    margin-top: var(--header-height);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(139, 175, 148, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(184, 160, 106, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-container {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-gold);
    color: var(--color-white);
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    border-radius: 50px;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.2s both;
    letter-spacing: 0.02em;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    line-height: 1.9;
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-feature-badge {
    background: linear-gradient(135deg, rgba(139, 175, 148, 0.2) 0%, rgba(139, 175, 148, 0.1) 100%);
    border: 2px solid var(--color-green);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    font-size: 0.95rem;
    line-height: 1.6;
    animation: fadeInUp 0.8s ease 0.5s both;
    display: inline-block;
}

.hero-scroll-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-gold);
    color: var(--color-white);
    font-weight: 700;
    font-size: 1rem;
    border-radius: 50px;
    transition: var(--transition-base);
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-scroll-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(184, 160, 106, 0.4);
}

.hero-scroll-btn svg {
    transition: var(--transition-base);
}

.hero-scroll-btn:hover svg {
    transform: translateY(3px);
}

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

/* ========================================
   6. Section Common Styles
   ======================================== */
.section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 900;
    color: var(--color-navy);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
    position: relative;
    display: inline-block;
}

.section-title::before {
    content: '';
    position: absolute;
    left: -30px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 60%;
    background-color: var(--color-gold);
    border-radius: 2px;
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.1rem);
    color: #666;
    line-height: 1.8;
}

.subtitle-small {
    font-size: 0.85em;
    font-weight: 400;
}

/* ========================================
   7. Promises Section (3つのお約束)
   ======================================== */
.promises-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.promise-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border-left: 5px solid var(--color-navy);
    position: relative;
    transition: var(--transition-base);
}

.promise-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.promise-card[data-border="navy"] {
    border-left-color: var(--color-navy);
}

.promise-card[data-border="green"] {
    border-left-color: var(--color-green);
}

.promise-card[data-border="gold"] {
    border-left-color: var(--color-gold);
}

.promise-number {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 3rem;
    font-weight: 900;
    color: rgba(45, 62, 107, 0.05);
}

.promise-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.promise-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.promise-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-gold-light);
    color: var(--color-gold);
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 50px;
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--color-gold);
}

.promise-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.promise-list li {
    position: relative;
    padding-left: 1.5rem;
    line-height: 1.8;
}

.promise-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-green);
    font-weight: 700;
}

.promise-list li.note {
    font-size: 0.9rem;
    color: #666;
    font-style: italic;
}

.promise-list li.note::before {
    content: '※';
    color: var(--color-gold);
}

/* ========================================
   8. Steps Section (4ステップ)
   ======================================== */
.steps-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 180px;
}

.step-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: var(--color-navy);
    color: var(--color-white);
    font-weight: 700;
    font-size: 0.9rem;
}

.step-item[data-color="navy"] .step-badge {
    background-color: var(--color-navy);
}

.step-item[data-color="green"] .step-badge {
    background-color: var(--color-green);
}

.step-item[data-color="gold"] .step-badge {
    background-color: var(--color-gold);
}

.step-label {
    text-align: center;
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.5;
}

.step-arrow {
    font-size: 1.5rem;
    color: var(--color-green);
    font-weight: 700;
}

/* Step Details */
.steps-details {
    display: grid;
    gap: var(--spacing-lg);
}

.step-detail-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.step-detail-card[data-bg="navy"] {
    background-color: var(--color-navy-light);
    border: 1px solid rgba(45, 62, 107, 0.2);
}

.step-detail-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: var(--spacing-md);
}

.step-detail-text {
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.doc-item {
    background-color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--color-border);
}

.alert-box {
    background-color: var(--color-gold-bg);
    border: 2px solid var(--color-gold);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    line-height: 1.7;
}

.step-detail-note {
    font-size: 0.95rem;
    line-height: 1.8;
    margin-top: var(--spacing-md);
}

.contract-documents {
    background-color: var(--color-green-light);
    border: 2px solid var(--color-green);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.contract-subtitle {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: var(--spacing-sm);
}

.contract-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.contract-list li {
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.7;
}

.contract-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-green);
    font-weight: 700;
}

.contract-note {
    font-size: 0.9rem;
    color: #666;
    margin-top: var(--spacing-sm);
    line-height: 1.6;
}

/* ========================================
   9. Pricing Section
   ======================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.pricing-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--color-border);
    position: relative;
    transition: var(--transition-base);
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.pricing-card[data-plan="b"] {
    background-color: var(--color-navy);
    color: var(--color-white);
    border-color: var(--color-navy);
}

.recommended-badge {
    position: absolute;
    top: -15px;
    right: var(--spacing-md);
    background-color: var(--color-gold);
    color: var(--color-white);
    padding: 0.35rem 1rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.85rem;
}

.pricing-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-navy);
}

.pricing-card[data-plan="b"] .pricing-title {
    color: var(--color-white);
}

.pricing-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.pricing-feature {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    line-height: 1.6;
}

.feature-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.bonus-banner {
    background-color: var(--color-gold);
    color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    margin-top: var(--spacing-md);
    line-height: 1.7;
}

.bonus-icon {
    font-size: 1.3rem;
    display: block;
    margin-bottom: 0.25rem;
}

.important-box {
    background-color: var(--color-gold-bg);
    border: 2px solid var(--color-gold);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-md);
    line-height: 1.8;
}

.important-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.important-content {
    flex: 1;
}

/* ========================================
   10. Operations Section (3アクション)
   ======================================== */
.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.action-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    text-align: center;
    position: relative;
    border-top: 4px solid var(--color-navy);
    transition: var(--transition-base);
}

.action-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.action-card[data-color="navy"] {
    border-top-color: var(--color-navy);
}

.action-card[data-color="green"] {
    border-top-color: var(--color-green);
}

.action-card[data-color="gold"] {
    border-top-color: var(--color-gold);
}

.action-number {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-navy-light);
    color: var(--color-navy);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.action-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.action-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: var(--spacing-md);
}

.action-text {
    line-height: 1.8;
    text-align: left;
}

/* ========================================
   11. Deadlines Section
   ======================================== */
.deadline-table-wrapper {
    overflow-x: auto;
    margin-bottom: var(--spacing-xl);
}

.deadline-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.deadline-table thead {
    background-color: var(--color-navy);
    color: var(--color-white);
}

.deadline-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 700;
}

.deadline-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.deadline-table tbody tr:last-child td {
    border-bottom: none;
}

.deadline-table tbody tr:hover {
    background-color: var(--color-light-gray);
}

.deadline-highlight {
    color: var(--color-navy);
    font-size: 1.2rem;
    font-weight: 700;
}

.warning-box {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border: 2px solid var(--color-warning);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-md);
    line-height: 1.8;
}

.warning-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.warning-content {
    flex: 1;
}

/* ========================================
   12. Changes Section (早見表 - カテゴリー分け)
   ======================================== */
.change-category {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border-left: 5px solid var(--color-navy);
    transition: var(--transition-base);
}

.change-category:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.category-icon {
    font-size: 1.8rem;
}

.category-name {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-navy);
}

.category-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.change-item {
    background-color: var(--color-light-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: var(--transition-fast);
}

.change-item:hover {
    background-color: #f0f0f0;
}

.change-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.change-event {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-navy);
}

.change-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-gold);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 50px;
    text-transform: uppercase;
}

.change-badge.alert {
    background-color: var(--color-alert);
}

.change-badge.annual {
    background-color: var(--color-green);
}

.change-detail {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.change-impact {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
    color: #333;
}

.change-note {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.7;
    padding-left: var(--spacing-md);
    border-left: 3px solid var(--color-gold);
}

/* Legacy table styles (hidden by default, kept for fallback) */
.changes-table-wrapper {
    display: none;
}

/* ========================================
   13. Final CTA Section
   ======================================== */
.final-cta {
    background: linear-gradient(135deg, var(--color-navy-gradient-start) 0%, var(--color-navy-gradient-end) 100%);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.final-cta::before {
    content: '';
    position: absolute;
    top: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 175, 148, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.final-cta-container {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.final-cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: var(--spacing-lg);
    line-height: 1.4;
}

.final-cta-text {
    font-size: clamp(1rem, 2vw, 1.15rem);
    line-height: 1.9;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.final-cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-gold);
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.1rem;
    border-radius: 50px;
    transition: var(--transition-base);
    box-shadow: 0 4px 12px rgba(184, 160, 106, 0.3);
}

.final-cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(184, 160, 106, 0.5);
}

.final-cta-button svg {
    transition: var(--transition-base);
}

.final-cta-button:hover svg {
    transform: translateX(4px);
}

/* ========================================
   14. Footer
   ======================================== */
.footer {
    background-color: var(--color-navy);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

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

.footer-logo {
    font-size: 1.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.05em;
}

.footer-text {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.footer-copyright {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ========================================
   15. Responsive Design (Mobile)
   ======================================== */
@media (max-width: 768px) {
    :root {
        --font-size-base: 15px;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }
    
    /* Utility Classes */
    .sp-only {
        display: inline;
    }
    
    .pc-only {
        display: none;
    }
    
    /* Header */
    .nav-toggle {
        display: flex;
        flex-direction: column;
        gap: 5px;
        width: 30px;
        height: 24px;
        cursor: pointer;
        z-index: 1001;
    }
    
    .nav-toggle span {
        display: block;
        width: 100%;
        height: 3px;
        background-color: var(--color-navy);
        border-radius: 2px;
        transition: var(--transition-base);
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .nav-list {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }
    
    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    /* Hero */
    .hero {
        min-height: calc(100vh - var(--header-height));
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    /* Section */
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section-title::before {
        left: -15px;
        width: 3px;
    }
    
    /* Steps Flow */
    .steps-flow {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
        margin: var(--spacing-sm) 0;
    }
    
    /* Tables */
    .deadline-table {
        font-size: 0.9rem;
    }
    
    .deadline-table th,
    .deadline-table td {
        padding: var(--spacing-sm);
    }
    
    /* Change Categories - Mobile Optimized */
    .change-category {
        padding: var(--spacing-md);
    }
    
    .category-title {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .category-name {
        font-size: 1.2rem;
    }
    
    .change-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .change-event {
        font-size: 1rem;
    }
    
    /* Pricing Grid */
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    /* Actions Grid */
    .actions-grid {
        grid-template-columns: 1fr;
    }
    
    /* Important/Warning Boxes */
    .important-box,
    .warning-box {
        flex-direction: column;
        text-align: center;
    }
}

/* ========================================
   16. Print Styles
   ======================================== */
@media print {
    .header,
    .nav,
    .hero-scroll-btn,
    .final-cta-button {
        display: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
}