/* ========================================
   リセット & ベース設定
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-white: #ffffff;
    --bg-gray: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    
    /* タイポグラフィ */
    --font-base: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* スペーシング */
    --section-padding: 100px;
    --container-max: 1200px;
    
    /* トランジション */
    --transition: all 0.3s ease;
    
    /* シャドウ */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
}

body {
    font-family: var(--font-base);
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

/* ========================================
   ユーティリティ
======================================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 15px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-gray);
}

.required {
    color: #ef4444;
}

/* ボタン */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

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

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

.btn-large {
    padding: 16px 36px;
    font-size: 1.125rem;
}

.btn-header {
    padding: 10px 24px;
    font-size: 0.95rem;
}

/* ========================================
   ヘッダー
======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.logo-sub {
    font-weight: 600;
    color: var(--text-dark);
}

.nav {
    display: flex;
    align-items: center;
    gap: 35px;
}

.nav-link {
    font-weight: 500;
    color: var(--text-dark);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.75rem;
    color: var(--text-dark);
    cursor: pointer;
}

/* モバイルメニュー */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: white;
    box-shadow: var(--shadow-xl);
    z-index: 2000;
    padding: 30px;
    transition: right 0.3s ease;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.75rem;
    color: var(--text-dark);
    cursor: pointer;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-top: 60px;
}

.mobile-nav-link {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-dark);
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

/* ========================================
   ヒーローセクション
======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    color: var(--text-dark);
    margin-bottom: 25px;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-gray);
    margin-bottom: 35px;
    line-height: 1.6;
}

.hero-price {
    display: block;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-top: 10px;
}

.hero-price strong {
    font-size: 3.5rem;
    font-weight: 900;
}

.hero-note {
    font-size: 1.125rem;
    color: var(--text-gray);
    margin-left: 10px;
}

.hero-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 40px;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.125rem;
    color: var(--text-dark);
}

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

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

.hero-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.laptop-illustration {
    width: 400px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    box-shadow: var(--shadow-xl);
    animation: float 3s ease-in-out infinite;
}

.laptop-illustration i {
    font-size: 12rem;
    color: white;
}

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

/* ========================================
   概要セクション
======================================== */
.overview {
    padding: 80px 0;
    background: white;
}

.overview-box {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    padding: 50px;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.overview-title {
    font-size: 1.75rem;
    line-height: 1.8;
    color: white;
    font-weight: 500;
}

.overview-title strong {
    font-size: 2.5rem;
    font-weight: 900;
    display: inline-block;
    margin: 0 8px;
}

/* ========================================
   料金プラン
======================================== */
.pricing {
    padding: var(--section-padding) 0;
    background: var(--bg-gray);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.pricing-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    border: 2px solid transparent;
}

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

.pricing-card-popular {
    border-color: var(--primary-color);
}

.pricing-card-best {
    border-color: var(--accent-color);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    right: 30px;
    background: var(--primary-color);
    color: white;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 700;
}

.pricing-badge-best {
    background: var(--accent-color);
}

.pricing-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 25px;
    border-bottom: 2px solid var(--border-color);
}

.pricing-plan-name {
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.pricing-plan-desc {
    font-size: 0.95rem;
    color: var(--text-gray);
}

.pricing-body {
    margin-bottom: 30px;
}

.pricing-price {
    text-align: center;
    margin-bottom: 15px;
}

.pricing-currency {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-gray);
    vertical-align: top;
}

.pricing-amount {
    font-size: 4rem;
    font-weight: 900;
    color: var(--primary-color);
    line-height: 1;
}

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

.pricing-range {
    text-align: center;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 30px;
    padding: 10px;
    background: var(--bg-gray);
    border-radius: 8px;
}

.pricing-features {
    list-style: none;
}

.pricing-features li {
    padding: 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features i {
    color: var(--success-color);
    font-size: 1.125rem;
}

.pricing-footer {
    text-align: center;
}

.pricing-notes {
    background: white;
    padding: 50px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.pricing-notes-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 30px;
    text-align: center;
}

.pricing-notes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.pricing-note-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.pricing-note-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.pricing-note-item strong {
    display: block;
    font-size: 1.125rem;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.pricing-note-item p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* ========================================
   機能セクション
======================================== */
.features {
    padding: var(--section-padding) 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.feature-card {
    background: var(--bg-gray);
    padding: 40px;
    border-radius: 20px;
    transition: var(--transition);
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 20px;
    margin-bottom: 25px;
}

.feature-icon i {
    font-size: 2.5rem;
    color: white;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.feature-desc {
    color: var(--text-gray);
    line-height: 1.8;
}

/* ========================================
   セキュリティセクション
======================================== */
.security {
    padding: var(--section-padding) 0;
    background: var(--bg-dark);
    color: white;
}

.security-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 80px;
    align-items: center;
}

.security-title {
    font-size: 2.5rem;
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: 50px;
}

.security-features {
    display: flex;
    flex-direction: column;
    gap: 35px;
}

.security-feature {
    display: flex;
    gap: 25px;
}

.security-icon {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
}

.security-icon i {
    font-size: 1.75rem;
    color: var(--success-color);
}

.security-feature h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.security-feature p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.security-illustration {
    width: 350px;
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    margin: 0 auto;
}

.security-illustration i {
    font-size: 10rem;
    color: var(--success-color);
}

/* ========================================
   バッテリーセクション
======================================== */
.battery {
    padding: var(--section-padding) 0;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
}

.battery-content {
    text-align: center;
}

.battery-icon-large {
    font-size: 6rem;
    color: var(--accent-color);
    margin-bottom: 30px;
}

.battery-title {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.battery-subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 60px;
}

.battery-reasons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 50px;
}

.battery-reason {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.battery-reason:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.battery-reason-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent-color);
    opacity: 0.3;
    margin-bottom: 20px;
}

.battery-reason h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.battery-reason p {
    color: var(--text-gray);
    line-height: 1.8;
}

/* ========================================
   スペックセクション
======================================== */
.specs {
    padding: var(--section-padding) 0;
    background: white;
}

.specs-table-container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
}

.specs-table th,
.specs-table td {
    padding: 25px 35px;
    text-align: left;
}

.specs-table th {
    background: var(--bg-gray);
    font-weight: 700;
    color: var(--text-dark);
    width: 35%;
}

.specs-table th i {
    margin-right: 12px;
    color: var(--primary-color);
    font-size: 1.25rem;
}

.specs-table td {
    background: white;
    color: var(--text-gray);
    font-size: 1.125rem;
}

.specs-table tr {
    border-bottom: 1px solid var(--border-color);
}

.specs-table tr:last-child {
    border-bottom: none;
}

/* ========================================
   お問い合わせセクション
======================================== */
.contact {
    padding: var(--section-padding) 0;
    background: var(--bg-gray);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-form {
    background: white;
    padding: 50px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    margin-bottom: 25px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font-base);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-submit {
    text-align: center;
    margin-top: 35px;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 900;
    margin-bottom: 15px;
}

.footer-logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.footer-logo span {
    color: white;
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.95rem;
}

.footer-links h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* ========================================
   スクロールトップボタン
======================================== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* ========================================
   レスポンシブデザイン
======================================== */

/* タブレット */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-price strong {
        font-size: 2.5rem;
    }
    
    .laptop-illustration {
        width: 300px;
        height: 300px;
    }
    
    .laptop-illustration i {
        font-size: 8rem;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto 60px;
    }
    
    .pricing-notes-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .security-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .security-illustration {
        width: 250px;
        height: 250px;
    }
    
    .security-illustration i {
        font-size: 7rem;
    }
    
    .battery-reasons {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 50px auto 0;
    }
}

/* モバイル */
@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }
    
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-price {
        font-size: 1.75rem;
    }
    
    .hero-price strong {
        font-size: 2.25rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .laptop-illustration {
        width: 250px;
        height: 250px;
    }
    
    .laptop-illustration i {
        font-size: 6rem;
    }
    
    .overview-box {
        padding: 35px 25px;
    }
    
    .overview-title {
        font-size: 1.25rem;
    }
    
    .overview-title strong {
        font-size: 1.75rem;
    }
    
    .pricing-amount {
        font-size: 3rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 30px 25px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .specs-table th,
    .specs-table td {
        padding: 18px 20px;
        font-size: 0.9rem;
    }
    
    .security-title {
        font-size: 1.75rem;
    }
    
    .battery-title {
        font-size: 1.75rem;
    }
    
    .scroll-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-feature {
        font-size: 1rem;
    }
    
    .btn-large {
        padding: 14px 28px;
        font-size: 1rem;
    }
    
    .laptop-illustration {
        width: 200px;
        height: 200px;
    }
    
    .laptop-illustration i {
        font-size: 5rem;
    }
}