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

/* Root Variables */
:root {
    /* Colors */
    --color-primary: #1e455a;
    --color-primary-hover: #163a4a;
    --color-secondary: #f9fafb;
    --color-accent: #0500ff;
    --color-text-primary: #101619;
    --color-text-secondary: #5f6365;
    --color-text-muted: #474747;
    --color-border: #eae9f2;
    --color-border-light: rgba(145, 148, 149, 0.15);
    --color-background: #ffffff;
    --color-background-alt: rgba(242, 242, 243, 0.2);
    --color-dark: #090f15;
    
/* Typography - 游ゴシック優先 */
    --font-primary: "游ゴシック体", "Yu Gothic", YuGothic, "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, sans-serif;
    --font-secondary: "游ゴシック体", "Yu Gothic", YuGothic, "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, sans-serif;
    --font-accent: "游ゴシック体", "Yu Gothic", YuGothic, "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, sans-serif;
    --font-display: 'Noto Sans JP', sans-serif;  /* 見出し専用 */
    --font-mono: "游ゴシック体", "Yu Gothic", YuGothic, "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, sans-serif;
    --font-bold: "游ゴシック体", "Yu Gothic", YuGothic, "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, sans-serif;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 80px;
    --spacing-4xl: 120px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shimmer Effect Variables */
    --glow-hue: 208deg;
    --shadow-hue: 208deg;
    --spring-easing: linear(
        0, 0.002, 0.01 0.9%, 0.038 1.8%, 0.156, 0.312 5.8%, 0.789 11.1%, 1.015 14.2%,
        1.096, 1.157, 1.199, 1.224 20.3%, 1.231, 1.231, 1.226, 1.214 24.6%,
        1.176 26.9%, 1.057 32.6%, 1.007 35.5%, 0.984, 0.968, 0.956, 0.949 42%,
        0.946 44.1%, 0.95 46.5%, 0.998 57.2%, 1.007, 1.011 63.3%, 1.012 68.3%,
        0.998 84%, 1
    );
    --spring-duration: 1.33s;
}

/* Print styles */
@media print {
    .header,
    .footer,
    .cta-section {
        display: none;
    }
    
    .hero-section,
    .problems-section,
    .advantages-section,
    .about-dify-section,
    .applications-section,
    .testimonials-section {
        page-break-inside: avoid;
        padding: var(--spacing-md) 0;
    }
}

/* Base Styles */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
   font-family: var(--font-display);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography - 見出しタグにNoto Sans JPを適用 */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-sm);
}

/* Button Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 12px var(--spacing-md);
    border: none;
    border-radius: var(--radius-full);
    font-family: var(--font-secondary);
    font-weight: 700;
    font-size: 14px;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    user-select: none;
}

.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.btn-outline {
    background: var(--color-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-light);
}

.btn-outline:hover {
    background: #f3f4f6;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

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

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

.btn-large {
    padding: 10px 24px;  
    font-size: 16px;
}

.btn-large svg {
    width: 16px;
    height: 16px;
}

.btn-cta {
    padding: var(--spacing-sm) var(--spacing-xl);
    font-size: 18px;
    font-weight: 600;
}
.btn-link {
    text-decoration: none;
}
/* Header */
.header {
    background: var(--color-background);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
 transition: all 0.3s ease;  /* この行を追加 */
}

/* PC版スクロール時のスタイル（新規追加） */
.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 36.5px 0;
    gap: var(--spacing-md);
}

.logo-wrapper {
    flex-shrink: 0;
}

.logo {
    height: 24px;
    filter: none;
}

.navigation {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-item {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 16px;
    color: var(--color-text-primary);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    position: relative;
}


/* ナビゲーション項目 */
.nav-item {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 16px;
    color: var(--color-text-primary);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    padding-bottom: calc(var(--spacing-xs) + 3px);  /* 下線との間隔 */
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    position: relative;
    
    /* 下線の設定 */
    background-image: linear-gradient(var(--color-primary), var(--color-primary));
    background-repeat: no-repeat;
    background-position: bottom left;  /* 左から始まる */
    background-size: 0 1px;  /* 初期状態は幅0、高さ1px */
    transition: background-size 0.3s ease;
}

.nav-item:hover {
    color: var(--color-primary);
    background-size: 100% 1px;  /* ホバー時に幅100% */
}

/* アクティブ時 */
.nav-item.active {
    color: var(--color-primary);
    font-weight: 600;
    background-size: 100% 1px;  /* 常に表示 */
}

/* ::after疑似要素は削除（不要） */
.header-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

/* Hero Section */
.hero-section {
    width: 100%;
    padding: 156px 0 172px 0;
    background: 
        url('images/hero-section-img.jpg') no-repeat,
        #ffffff;
    background-size: auto 90%;
    background-position: right 20% top 30%;
    display: flex;
    align-items: center;
}

.hero-content {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: nowrap;
    
}

.powered-by-badge {
    display: inline-flex;
    align-items: center;
    margin-bottom: var(--spacing-xs); 
}

.powered-badge-svg {
    height: 20px;
    width: auto;
    object-fit: contain;
}

.hero-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.title-line {
    display: block;
}

.title-highlight {
    background: linear-gradient(135deg, var(--color-primary) 0%, #2563eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    margin-bottom: var(--spacing-xl);
}

.subtitle-main {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.subtitle-main .char {
    display: inline-block;
}

.subtitle-description {
     font-family: 'Noto Sans JP', sans-serif;
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.stat-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
}

.stat-value {
    font-family: var(--font-bold);
    font-weight: 800;
    font-size: 32px;
    color: var(--color-primary);
}

.avatar-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.stat-text {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 16px;
    color: var(--color-text-primary);
}

.stat-suffix {
    font-family: var(--font-secondary);
    font-weight: 500;
    font-size: 16px;
    color: var(--color-text-primary);
}

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

.hero-image {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-slow);
}

.hero-image:hover {
    transform: scale(1.02);
}

/* Partnership Section */
.partnership-section {
    background: var(--color-dark);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    color: white;
}

.tech-tags {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.tech-tag {
    font-family: 'Arial', sans-serif;
    font-size: 14px;
    white-space: nowrap;
}

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

.tag-bracket-white {
    font-weight: 700;
    color: white!important;
}

.tag-text {
    color: white;
    font-weight: 400;
}

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

.partner-description {
    font-size: 18px;
    color: white;
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
}

.partner-logo {
    margin-top: var(--spacing-xl);
}

.partner-svg {
    height: 60px;
    width: auto;
    object-fit: contain;
    background-color: white;
}

.partner-logo .partner-svg {
    max-width: 250px;
    height: auto;
    filter: brightness(1);
}

.partner-text {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-accent) 0%, #3b82f6 100%);
    color: white;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 20px;
    letter-spacing: 1px;
}

/* Section Common Styles */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.badge-dot {
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
}

.badge-text {
    font-family: var(--font-accent);
    font-weight: 400;
    font-size: 18px;
    color: var(--color-text-primary);
}

.section-title {
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.section-title.with-lines {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.section-title.with-lines::before,
.section-title.with-lines::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 280px;
    height: 1px;
    background-color: #919191;
}

.section-title.with-lines::before {
    left: 0;
    transform: translateY(-50%);
}

.section-title.with-lines::after {
    right: 0;
    transform: translateY(-50%);
}

.section-description {
     font-family: 'Noto Sans JP', sans-serif;
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 700px;
    margin: 0 auto;
}

.section-note {
    font-size: 14px;
    color: var(--color-text-muted);
    font-style: italic;
    margin-top: var(--spacing-sm);
}

/* Problems Section */
.problems-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-background);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.problem-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.problem-badge {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.problem-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.problem-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 4px;
}

.title-divider {
    margin: 4px auto var(--spacing-md);
    display: flex;
    justify-content: center;
}

.divider-svg {
    width: 220px;  
    height: auto;
    object-fit: contain;
}

.problem-description {
    flex: 1;
    text-align: left;
}

.problem-description > p {
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.problem-list {
    list-style: none;
    padding: 0;
}

.problem-list li {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-sm);
    position: relative;
}

.problem-list li::before {
    content: '•';
    color: var(--color-primary);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Solution Banner */
.solution-banner {
    text-align: center;
    padding: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.solution-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    position: relative;
}

.solution-content::before {
    content: '';
    position: absolute;
    width: 100px;
    border-top: 3px dotted #1a1a1a;
    left: 19%;
    top: -50%;
    transform: rotate(45deg);
    transform-origin: left center;
}

.solution-content::after {
    content: '';
    position: absolute;
    width: 100px;
    border-top: 3px dotted #1a1a1a;
    right: 19%;
    top: -50%;
    transform: rotate(-45deg);
    transform-origin: right center;
}

.solution-text {
    font-size: clamp(24px, 3vw, 32px);
    line-height: 1.3;
    white-space: nowrap;
}

.solution-normal {
    font-weight: 500;
    color: var(--color-text-muted);
}

.solution-highlight {
    font-weight: 800;
    color: var(--color-primary);
}

.solution-exclamation {
    font-weight: 800;
    color: var(--color-primary);
}

.solution-subtitle {
    font-size: clamp(18px, 2.5vw, 24px);
    font-weight: 700;
    color: var(--color-text-muted);
    line-height: 1.4;
    max-width: 1000px;
    margin: 0 auto;
}

/* Advantages Section */
.advantages-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-background-alt);
}

.title-decorations {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-4xl);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.decoration-line {
    width: 200px;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--color-border) 50%, transparent 100%);
}

.advantages-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4xl);
}

.advantage-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.advantage-reverse {
    direction: rtl;
}

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

.advantage-visual {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.advantage-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    transition: transform var(--transition-slow);
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-xl);
}

.advantage-content {
    padding: var(--spacing-md);
}

.advantage-number {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.number-text {
    font-size: 36px;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.number-accent {
    width: 60px;
    height: 1px;
    background: #101619;
    border-radius: 0;
}

.advantage-title {
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.advantage-description {
    font-size: 16px;
    color: var(--color-text-muted);
    line-height: 1.8;
}

/* About Dify Section */
.about-dify-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-background);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-visual {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.dify-platform-image {
    width: 120%;
    height: auto;
    margin-left: -10%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.about-text {
    padding: var(--spacing-md);
}

.about-header {
    margin-bottom: var(--spacing-xl);
}

.dify-logo-text {
    font-family: var(--font-display);
    font-size: 48px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-primary) 0%, #2563eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-description {
     font-family: 'Noto Sans JP', sans-serif;
    font-size: 16px;
    color: var(--color-text-primary);
    line-height: 1.8;
}

/* Applications Section */
.applications-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-background);
}

.applications-list {
    display: flex;
    flex-direction: column;
     gap: 0;
}

.application-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
}

/* Application items のボーダー追加 */
.application-item:not(:last-child) {
    padding-bottom: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

/* 奇数番目：左から70% */
.application-item:nth-child(odd):not(:last-child)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 70%;
    height: 1px;
    background-color: #e0e0e0;
}

/* 偶数番目：右から70% */
.application-item:nth-child(even):not(:last-child)::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 70%;
    height: 1px;
    background-color: #e0e0e0;
}

.application-reverse {
    direction: rtl;
}

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

.application-visual {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.application-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.application-content {
    padding: var(--spacing-md);
}

.application-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 8px; 
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 9px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.application-title {
    font-size: clamp(20px, 2.5vw, 28px);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

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

/* Video Section */
.video-section {
    background: var(--color-background-alt);
    padding: 0;
    margin-top: 60px;
}

.video-container {
    width: 100%;
    margin: 0 auto;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    background: #000;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}


/* Testimonials Section */
.testimonials-section {
    padding: var(--spacing-4xl) 0 200px 0;
    background: var(--color-background-alt);
    padding-top: 200px;
}
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

.testimonial-card {
    background: white;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xs);
    transition: all var(--transition-normal);
    height: 100%;
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.testimonial-content {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-secondary);
    border-radius: var(--radius-lg);
    height: 100%;
}

.testimonial-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    border: 2px solid white;
    box-shadow: var(--shadow-sm);
}

.testimonial-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.testimonial-department {
    font-weight: 600;
    font-size: 12px;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.testimonial-quote {
    font-size: 14px;
    color: var(--color-text-primary);
    line-height: 1.6;
    flex: 1;
}

/* Call to Action Section */
.cta-section {
    position: relative;
    padding: var(--spacing-3xl) 0;
    margin-bottom: 30px;
    text-align: center;
    color: white;
    overflow: hidden;
    background-image: url('images/cta-background.jpg');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}

.cta-section::before {
    background: linear-gradient(135deg, 
        rgba(9, 15, 21, 0.2) 0%,
        rgba(30, 69, 90, 0.2) 100%);
}

.cta-section .container {
    position: relative;
    z-index: 2;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: white;
}

.cta-description {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--color-background);
}

.footer-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xl) 0;
    gap: var(--spacing-md);
}

.footer-brand {
    flex-shrink: 0;
}

.footer-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

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

.footer-nav-item {
    position: relative;
    font-size: 14px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.footer-nav-item::after {
    position: absolute;
    left: 0;
    content: '';
    width: 100%;
    height: 1px;
    background: var(--color-primary);
    bottom: -2px;
    transform: scale(0, 1);
    transform-origin: center;
    transition: transform 0.3s;
}

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

.footer-nav-item:hover::after {
    transform: scale(1, 1);
}

.footer-nav-item:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.footer-divider {
    width: 100%;
    height: 1px;
    background: var(--color-border);
}

.footer-copyright {
    width: 100%;
    text-align: center;
    padding: var(--spacing-md) var(--spacing-md);
    background: var(--color-background);
}

.footer-copyright p {
    font-family: var(--font-accent);
    font-weight: 300;
    font-size: 14px;
    color: var(--color-text-secondary);
    margin: 0;
}

/* Footer Bottom */
.footer-bottom {
    background: var(--color-dark);
    padding: var(--spacing-xl) 0;
}

.footer-tags {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.footer-tag {
    font-family: 'Arial', sans-serif;
    font-size: 13px;
    white-space: nowrap;
}

.partner-section {
    text-align: center;
}

/* Mobile Menu */
.hamburger-menu {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    position: relative;
    z-index: 102;
    padding: 0;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: #1e455a;
    margin: 5px auto;
    transition: all 0.3s ease;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    z-index: 101;
    transition: right 0.3s ease;
}

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

.mobile-menu-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-menu.active .mobile-menu-overlay {
    opacity: 1;
}

.mobile-menu-content {
    position: absolute;
    top: 0;
    right: 0;
    width: 280px;
    height: 100%;
    background: #ffffff;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    padding: 80px 24px 40px;
}

.mobile-menu.active .mobile-menu-content {
    transform: translateX(0);
}

.mobile-menu-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    font-size: 24px;
    color: #1e455a;
    cursor: pointer;
}

.mobile-nav-item {
    display: block;
    padding: 16px 0;
    font-size: 16px;
    font-family: var(--font-display);  /* Noto Sans JP */
    font-weight: 500;  /* Medium */
    color: #101619;
    text-decoration: none;
    border-bottom: 1px solid #eae9f2;
    transition: all 0.3s ease;
}

.mobile-nav-item:hover {
    color: #1e455a;
    padding-left: 8px;
}

.hamburger-menu.active .hamburger-line:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger-menu.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active .hamburger-line:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

body.menu-open {
    overflow: hidden;
}

/* Shimmer Effect */
@property --shimmer {
    syntax: "<angle>";
    inherits: false;
    initial-value: 33deg;
}

@keyframes shimmer {
    0% { --shimmer: 0deg; }
    100% { --shimmer: 360deg; }
}

@keyframes shine {
    0% { opacity: 0; }
    15% { opacity: 1; }
    55% { opacity: 1; }
    100% { opacity: 0; }
}

@keyframes text {
    0% { background-position: 100% center; }    
    100% { background-position: -100% center; }    
}

.btn-primary.shimmer-effect {
    min-width: 160px;
    position: relative;
    isolation: isolate;
    overflow: hidden;
    scale: 1;
    transition: all var(--spring-duration) var(--spring-easing);
}

.btn-primary.shimmer-effect:hover:not(:active) {
    transition-duration: calc(var(--spring-duration)*0.5);
    scale: 1.00;
    box-shadow: 0 4px 8px -2px hsl(var(--glow-hue) 50% 20% / 50%), 
                inset 0 0 0 transparent;
}

.btn-primary.shimmer-effect:active {
    scale: 1.02;
    transition-duration: calc(var(--spring-duration)*0.5);
}

.btn-primary.shimmer-effect .text {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    position: relative;
    z-index: 1;
}

.btn-primary.shimmer-effect .text span {
    color: transparent;
    background-clip: text;
    -webkit-background-clip: text;
    background-color: white;
    background-image: linear-gradient(120deg, transparent, 
                     hsla(var(--glow-hue),100%,80%,0.66) 40%, 
                     hsla(var(--glow-hue),100%,90%,.9) 50%, transparent 52%);
    background-repeat: no-repeat;
    background-size: 300% 300%;
    background-position: center 200%;
}

.btn-primary.shimmer-effect:hover .text {
    animation: text .66s ease-in 1 both;
}

.btn-primary.shimmer-effect .text svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    color: white;
    fill: white;
}

.btn-primary.shimmer-effect:hover .text span {
    animation: text .66s ease-in 1 both;
}

.shimmer {
    position: absolute;
    inset: -40px;
    border-radius: inherit;
    mask-image: conic-gradient(
        from var(--shimmer, 0deg),
        transparent 0%, transparent 10%, black 36%, black 45%,
        transparent 50%, transparent 60%, black 85%, black 95%,
        transparent 100%
    );
    mask-size: cover;
    mix-blend-mode: plus-lighter;
    animation: shimmer 1s linear infinite both;
}

.btn-primary.shimmer-effect:hover .shimmer::before,
.btn-primary.shimmer-effect:hover .shimmer::after {
    opacity: 1;
    animation: shine 1.2s ease-in 1 forwards;
}

.shimmer::before,
.shimmer::after {
    transition: all 0.5s ease;
    opacity: 0;
    content: "";
    border-radius: inherit;
    position: absolute;
    mix-blend-mode: color;
    inset: 40px;
    pointer-events: none;
}

.shimmer::before {
    box-shadow: 0 0 3px 2px hsl(var(--glow-hue) 20% 95%),
                0 0 7px 4px hsl(var(--glow-hue) 20% 80%),
                0 0 13px 4px hsl(var(--glow-hue) 50% 70%),
                0 0 25px 5px hsl(var(--glow-hue) 100% 70%);
    z-index: -1;
}

.shimmer::after {
    box-shadow: inset 0 0 0 1px hsl(var(--glow-hue) 70% 95%),
                inset 0 0 2px 1px hsl(var(--glow-hue) 100% 80%),
                inset 0 0 5px 2px hsl(var(--glow-hue) 100% 70%);
    z-index: 2;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

.btn:focus-visible,
.nav-item:focus-visible,
.footer-nav-item:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Hero Section Responsive */
@media (min-width: 1800px) {
    .hero-section {
        background: url('images/1920-1080_hero-section-img.jpg?v=2') no-repeat, #ffffff;
        background-position: right -5% top -30%;
        background-size: auto 100% !important;
    }
}

@media (min-width: 1600px) and (max-width: 1790px) {
    .hero-section {
        background-position: right -15% top -80%;
        background-size: auto 93%;
    }
}

@media (min-width: 1420px) and (max-width: 1599px) {
    .hero-section {
        background-position: right 15% top -80%;
        background-size: auto 90%;
    }
    .subtitle-description {
        max-width: 600px;
    }
}

@media (min-width: 1180px) and (max-width: 1319px) {
    .hero-section {
        background-position: right 15% top -30%;
        background-size: auto 70%;
        padding: 100px 0 172px 0;
    }
    
    .hero-content {
        transform: translateY(-50px);
    }
    
    .hero-text {
        max-width: 55%;
        flex-shrink: 0;
    }
}

/* Large Screens (1200px) */
@media (max-width: 1200px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .hero-content,
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .advantage-item,
    .application-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .advantage-reverse,
    .application-reverse {
        direction: ltr;
    }
    
    .video-container {
        max-width: 100%;
        padding: 0 var(--spacing-md);
    }
    
    .section-title.with-lines::before,
    .section-title.with-lines::after {
        width: 140px;  
    }
    
    .dify-platform-image {
        width: 110%;
        margin-left: -5%;
    }
}
.sp-br {
    display: none;
}

@media (max-width: 768px) {
    .sp-br {
        display: inline;
    }
}
/* PC版では<br>タグを表示（改行あり） */
.pc-br {
    display: inline;
}

/* SP版では<br>タグを非表示（改行なし） */
@media (max-width: 768px) {
    .pc-br {
        display: none;
    }
}
/* ===== 768px メディアクエリ統合 ===== */
@media (max-width: 768px) {
    /* Container */
    .container {
        padding: 0 var(--spacing-sm);
    }
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0;
    background: linear-gradient(
        to bottom, 
        rgba(0, 0, 0, 0.95) 0%, 
        rgba(0, 0, 0, 0.85) 100%
    );
    backdrop-filter: blur(10px);
    transition: box-shadow 0.3s ease;  /* トランジション追加 */
}

/* スクロール時のみボーダー表示 */
.header.scrolled-mobile {
    box-shadow: 0 2px 0px 0px rgba(0, 0, 0, 0.3);
}

/* ロゴを白色に */
.header .logo {
    filter: brightness(0) invert(1);
}

    .header-content {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 16px 0;
        height: 60px;
        gap: 0;
    }
    
    .logo-wrapper {
        flex-shrink: 0;
    }
    
    .navigation {
        display: none;
    }
    
    .hamburger-menu {
        display: block !important;
    }
    
    .hamburger-line {
        background: #ffffff;
    }
    
    .header-actions {
        display: flex !important;
        align-items: center;
        flex-shrink: 0;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .header-actions .btn {
        display: none;
    }
    
    /* Main */
    main {
        padding-top: 0;
    }
    
    
    p {
    text-align: left;
}
    /* Hero Section */
    .hero-section {
        background: url('images/sp_mv.jpg') no-repeat center center;
        background-size: cover;
        min-height: 620px;
        padding: 100px 0 40px 0;
        color: white;
    }
    
    .hero-content {
        padding: 0 16px;
    }
    
    .hero-title,
    .subtitle-main,
    .subtitle-description {
        color: white;
    }
    
    .hero-title {
        font-size: 32px;
        line-height: 1.3;
        margin-bottom: 16px;
    }
    
    .title-highlight {
        background: linear-gradient(135deg, #ffffff 0%, #ffffff 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    
    .powered-by-badge {
        background-color: #ffffff;
        display: inline-flex;
    }
    
    .powered-badge-svg {
        height: 14px;
    }
    
    .subtitle-main {
        font-size: 16px;
    }
    
    .subtitle-description {
        font-size: 14px;
        line-height: 1.6;
    }
    
    .hero-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        margin-bottom: 24px;
        justify-content: center;
    }
    
    .hero-actions .btn {
        width: 100%;
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .hero-actions .btn svg {
        width: 14px;
        height: 14px;
    }
    
    .hero-stats {
        display: none;
    }
    
    .stat-item {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-xs);
    }
    
    /* Partnership Section */
    .partnership-section {
        padding: 40px 0;
    }
    
    .tech-tags {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .partner-description {
        font-size: 14px;
        line-height: 1.6;
    }
    
    .partner-text {
        font-size: 16px;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .partner-svg {
        height: 40px;
    }
    
    /* Problems Section */
    .problems-section {
        padding: 60px 0;
    }
    
    .problems-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    /* Section Common */
    .section-title {
        font-size: 24px;
    }
    
    .section-title.with-lines::before,
    .section-title.with-lines::after {
        width: 60px; 
    }
    
    .section-description {
        font-size: 14px;
    }
    
    /* Solution Banner */
    .solution-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .solution-content::before,
    .solution-content::after {
        display: none;
    }
    
    .solution-text {
        font-size: 20px;
    }
    
    .solution-subtitle {
        font-size: 16px;
    }
    
    

    /* Advantages Section */
    .advantages-section {
        padding: 20px 0;
    }
    
    .advantage-item,
    .application-item {
        grid-template-columns: 1fr;
        gap: 24px;
    }
.advantages-list,
.applications-list {
    gap: var(--spacing-md);  /* 24px */
}
    .advantage-reverse,
    .application-reverse {
        direction: ltr;
    }
    
    .advantage-image,
    .application-image {
        height: 200px;
    }
    
    .advantage-title,
    .application-title {
        font-size: 20px;
    }
    
    /* About Dify Section */
.about-dify-section {
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);  /* #eae9f2 */
}
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
.about-visual {
    margin-bottom: 0;
    height: 280px;  /* 高さを増やす */
    overflow: hidden;
    position: relative;
}

.dify-platform-image {
    width: 100%;
    height: auto;
    min-height: 100%;  /* 最小高さを確保 */
    object-fit: cover;
    object-position: center center;
    margin-left: 0;
}
/* about-header のmargin-bottomを削除 */
.about-header {
    margin-bottom: 0;  /* コメントアウトの代わりに0に */
}    
    .dify-platform-image {
        width: 100%;
        margin-left: 0;
    }
    
    .dify-logo-text {
        font-size: 36px;
    }
    
    /* Applications Section */
    .applications-section {
        padding: 20px 0;
    }
    .application-item {
    display: flex;
    flex-direction: column-reverse;  /* 逆順にする */
}
    
        .application-item:not(:last-child) {
        padding-bottom: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }
    

    /* Video Section */
    .video-section {
    padding: 30px 0;
    margin-top: 40px;
    }
    
    .video-wrapper {
        border-radius: var(--radius-lg);
    }
    
    .video-section .container {
    padding: 0 8px;  /* 左右16px→8pxに */
}

.video-container {
    max-width: 100%;
     padding: 5px;
}
    /* Testimonials Section */
    .testimonials-section {
        padding-top: 60px;
        padding-bottom: 80px;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .testimonial-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    .testimonial-quote {
        text-align: left;
}
    /* CTA Section */
    .cta-section {
        padding: 60px 0;
        background-image: url('images/cta-background-mobile.jpg');
        background-attachment: scroll;
    }
    
    .cta-title {
        font-size: 20px;
    }
    
    .cta-description {
        font-size: 14px;
    }
    
    .cta-section .btn {
        width: 100%;
        max-width: 280px;
    }
    .cta-description{
        text-align: center;
    }
    /* Footer */
    .footer-main {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
        padding: 32px 0;
    }
    
    .footer-nav {
        justify-content: center;
        gap: var(--spacing-sm);
    }
    
    .footer-tags {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .footer-copyright p {
        text-align: center
    }
    /* Other */
    .quote-mark {
        font-size: 32px;
    }
}

/* Small Screens (480px) */
@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 20px;
    }
    
    .section-title.with-lines::before,
    .section-title.with-lines::after {
        display: none;
    }
    
    .solution-text {
        font-size: 18px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-large {
        width: 100%;
        max-width: 280px;
    }
    
    .advantage-image,
    .application-image {
        height: 250px;
    }
}

/* CTA Background Responsive */
@media (max-width: 1440px) {
    .cta-section {
        background-image: url('images/cta-background-medium.jpg');
    }
}

/* ページトップボタン */
.page-top-button {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 99;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.page-top-button:hover {
    background: var(--color-primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.page-top-button.show {
    opacity: 1;
    visibility: visible;
}

/* SP版での調整 */
@media (max-width: 768px) {
    .page-top-button {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}
/* タブレット用調整 */
@media (min-width: 769px) and (max-width: 1100px) {
    /* Applications Section */
    .application-item {
        gap: var(--spacing-xl);  /* 間隔を狭める */
    }
    
    .application-visual {
        min-width: 300px;  /* 最小幅を確保 */
    }
    
    .advantage-image {
    height: 500px;

}
    
.application-image {
    height: 500px;

}
    .application-content {
        padding: var(--spacing-sm);  /* パディング調整 */
    }
    
    /* セクション全体の余白調整 */
    .applications-section {
        padding: var(--spacing-3xl) 0;
    }
}

/* より狭いタブレット（1024px以下）の微調整 */
@media (min-width: 769px) and (max-width: 1024px) {
    .application-item {
        grid-template-columns: 1fr;  /* 1カラムレイアウトに */
        gap: var(--spacing-md);
    }
    
    .advantage-image {
    height: 500px;
}
    
    /* 順序の調整 */
    .application-visual {
        order: 2;
    }
    
    .application-content {
        order: 1;
    }
}
/* タブレット用ナビゲーション調整 */
@media (min-width: 769px) and (max-width: 1100px) {
    /* ナビゲーションテキスト調整 */
    .navigation {
        gap: var(--spacing-md);  /* 間隔を狭める */
    }
    
    .nav-item {
        font-size: 14px;  /* フォントサイズを小さく */
        padding: var(--spacing-xs) 12px;  /* パディング調整 */
    }
    
    /* ヘッダーボタン調整 */
    .header-actions .btn {
        font-size: 13px;
        padding: 10px 16px;
    }
    
    .header-actions .btn svg {
        width: 12px;
        height: 12px;
    }
   .hero-section {
        background-image: url(images/hero-section-tablet.jpg);
        background-position: right 10% top 65%;
        background-size: auto 70%;
    }
    
    .hero-text {
        max-width: 60%;  /* 背景画像との重なりを防ぐ */
    }
    
    .subtitle-description {
        max-width: 500px;  /* 最大幅を制限 */
        line-height: 1.6;
    }
      .hero-stats {
        gap: var(--spacing-md);  /* 間隔を狭める */
    }
    
    .stat-item {
        flex-wrap: nowrap;  /* 折り返し防止 */
        white-space: nowrap;  /* テキスト折り返し防止 */
    }
    
    .stat-text {
        font-size: 14px;  /* フォントサイズ縮小 */
    }
    
    .stat-value {
        font-size: 28px;  /* 数値も少し小さく */
    }
    .solution-content::after {
    right: 10%;
}
    .solution-content::before {
    left: 10%;
}
    
}

/* 1024px以下でのさらなる調整 */
@media (min-width: 769px) and (max-width: 1024px) {
    /* コンテナ全体の余白調整 */
    .container {
        padding: 0 20px;
    }
    
    /* ナビゲーション項目をさらにコンパクトに */
    .nav-item {
        font-size: 13px;
        padding: 6px 10px;
    }
    
    .advantage-image {
    height: 100%;

}
    /* ロゴサイズ調整 */
    .logo {
        height: 20px;
    }
}
.video-thumbnail-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.2);
    z-index: 1;
    transition: opacity 0.3s ease;
}

.video-thumbnail-overlay.playing {
    opacity: 0;
    pointer-events: none;
}

.video-play-btn {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.video-play-btn:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.95);
}

.video-play-btn svg {
    width: 30px;
    height: 30px;
    margin-left: 3px;  /* 視覚的に中心に見えるよう調整 */
    color: #1e455a;
}