/* --------------------
   変数定義
-------------------- */
:root {
    /* カラーパレット */
    --line-green: #06C755;
    --line-green-dark: #05a648;
    --line-green-light: #4ddC89;
    --white: #ffffff;
    --off-white: #f8f9fa;
    --light-gray: #e9ecef;
    --medium-gray: #adb5bd;
    --dark-gray: #495057;
    --black: #212529;
    --accent-blue: #3282f6;
    --accent-red: #fa5252;
    
    /* テキスト */
    --text-primary: #343a40;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --text-light: #f8f9fa;
    
    /* 間隔 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    
    /* フォントサイズ */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3rem;
    --font-size-5xl: 4rem;
    
    /* 境界線 */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    --border-radius-full: 9999px;
    
    /* シャドウ */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 16px 24px rgba(0, 0, 0, 0.15);
    
    /* レイアウト */
    --container-width: 1200px;
    --header-height: 80px;
    
    /* トランジション */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}
.full-width-image-container {
    width: 100%;
    margin: 3rem auto;
    padding: 0 1rem;
    max-width: 1400px;
}

.full-width-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.full-width-image:hover {
    transform: scale(1.01);
}

/* --------------------
   リセットとベーススタイル
-------------------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text-primary);
    background-color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

/* --------------------
   ユーティリティクラス
-------------------- */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.text-highlight {
    color: var(--line-green);
    font-weight: 500;
}

.shadow-img {
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.shadow-img:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.required {
    color: var(--accent-red);
}

/* --------------------
   ヘッダーとナビゲーション
-------------------- */
.header {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    transition: all var(--transition-normal);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: inline-block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    z-index: 1001;
}

.logo-text {
    background: linear-gradient(to right, var(--line-green), var(--line-green-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

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

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

.nav-link {
    color: var(--text-primary);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--line-green);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--line-green);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.highlight {
    color: var(--line-green);
}

.header-cta {
    margin-left: var(--spacing-md);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-normal);
}

/* --------------------
   ボタン
-------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-full);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    font-size: var(--font-size-md);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--line-green);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

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

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

.btn-outline:hover {
    border-color: var(--line-green);
    color: var(--line-green);
    transform: translateY(-2px);
}

.btn-line {
    background-color: var(--line-green);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

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

.btn-line-mini {
    background-color: var(--line-green);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-line-mini:hover {
    background-color: var(--line-green-dark);
}

.btn-text {
    color: var(--line-green);
    padding: 0;
    display: inline-flex;
    align-items: center;
    background: none;
    border: none;
    font-weight: 500;
}

.btn-text i {
    margin-left: 0.5rem;
    transition: transform var(--transition-normal);
}

.btn-text:hover {
    color: var(--line-green-dark);
}

.btn-text:hover i {
    transform: translateX(4px);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

.btn-block {
    display: block;
    width: 100%;
}

/* --------------------
   ヒーローセクション
-------------------- */
.hero {
    padding: calc(var(--header-height) + var(--spacing-xl)) 0 var(--spacing-xl);
    position: relative;
    background-color: var(--off-white);
    background-image: linear-gradient(120deg, rgba(6, 199, 85, 0.05), rgba(6, 199, 85, 0.02));
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.hero-content {
    flex: 1;
}

.badge {
    display: inline-block;
    background-color: rgba(6, 199, 85, 0.1);
    color: var(--line-green);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(6, 199, 85, 0.2);
}

.hero-title {
    font-size: var(--font-size-5xl);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.text-line {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.hero-features {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.feature-card {
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    flex: 1;
    text-align: center;
    transition: all var(--transition-normal);
}

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

.feature-icon {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-2xl);
    color: var(--line-green);
}

.feature-card p {
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.floating {
    animation: float 6s ease-in-out infinite;
}

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

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
}

.scroll-indicator span {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.pulse {
    animation: pulse 2s infinite;
    color: var(--line-green);
}

@keyframes pulse {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(10px);
    }
    100% {
        transform: translateY(0);
    }
}

/* --------------------
   セクション共通スタイル
-------------------- */
section {
    padding: var(--spacing-xl) 0;
}

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

.section-header h2 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-sm);
}

.section-divider {
    width: 60px;
    height: 3px;
    background-color: var(--line-green);
    margin: 0 auto;
}

.section-tagline {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-top: var(--spacing-md);
}
/* ビジョンコンセプトセクション */
.vision-concept {
    padding: 5rem 0;
    background-color: var(--black);
    position: relative;
    overflow: hidden;
}

.vision-concept::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(6, 199, 85, 0.05) 0%, rgba(50, 130, 246, 0.05) 100%);
    z-index: 0;
}

.concept-header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    z-index: 1;
}

.concept-title {
    font-size: var(--font-size-4xl);
    margin-bottom: 1rem;
    font-weight: 300;
    letter-spacing: -0.01em;
    color: var(--white);
}

.concept-tagline {
    font-size: var(--font-size-xl);
    color: var(--text-light);
    line-height: 1.5;
    max-width: 700px;
    margin: 0 auto;
}

.concept-content {
    display: flex;
    flex-direction: column-reverse; /* モバイルではテキストの上に画像 */
    justify-content: center;
    align-items: center;
    gap: 3rem;
    margin-bottom: 4rem;
    position: relative;
    z-index: El;
}

.concept-text {
    max-width: 800px;
    text-align: center;
}

.concept-text p {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.concept-text p strong {
    font-size: 1.5rem;
    color: var(--line-green);
    font-weight: 300;
    display: block;
    margin: 2rem 0;
}
.concept-image {
    max-width: 100%;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.concept-image img {
    display: block;
    width: 100%;
    height: auto;
    transition: transform var(--transition-normal);
}

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

/* デスクトップでは横並びに */
@media (min-width: 992px) {
    .concept-content {
        flex-direction: row;
        text-align: left;
        align-items: center;
    }
    
    .concept-text {
        flex: 1;
        text-align: left;
    }
    
    .concept-image {
        flex: 1;
        max-width: 500px;
    }
}

.highlight-block {
    padding: 2rem;
    background-color: rgba(255, 255, 255, 0.05);
    border-left: 3px solid var(--line-green);
    font-size: 1.4rem !important;
    line-height: 1.6 !important;
    margin: 2.5rem 0 !important;
}

.text-accent {
    color: var(--line-green);
    font-weight: 500;
}

.concept-features {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    position: relative;
    z-index: 1;
}

/* PC表示では横並び */
@media (min-width: 768px) {
    .concept-features {
        flex-direction: row;
    }
    
    .concept-feature {
        flex: 1;
        min-width: 250px;
        max-width: 350px;
    }
}

.concept-feature {
    padding: 2rem;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-md);
    text-align: center;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.concept-feature:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background-color: rgba(255, 255, 255, 0.08);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--line-green-dark) 0%, var(--line-green) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--white);
}

.concept-feature h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 1rem;
    color: var(--line-green);
}

.concept-feature p {
    font-size: var(--font-size-md);
    color: var(--text-muted);
    line-height: 1.6;
}
/* --------------------
   価値提案セクション
-------------------- */
.value-proposition {
    background-color: var(--white);
    position: relative;
}

.dual-structure {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.structure-item {
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-md);
    width: 180px;
    transition: all var(--transition-normal);
}

.structure-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.structure-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
}

.video-icon {
    color: var(--accent-blue);
}

.message-icon {
    color: var(--line-green);
}

.result-icon {
    color: var(--accent-red);
}

.result-item {
    background-color: var(--off-white);
    width: 200px;
}

.structure-plus,
.structure-equals {
    font-size: var(--font-size-2xl);
    color: var(--text-muted);
}

.structure-item h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.structure-item p {
    font-size: var(--font-size-sm);
    line-height: 1.4;
    color: var(--text-muted);
}

.system-image {
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

.value-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.value-card {
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    height: 100%;
}

.value-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-left: 3px solid var(--line-green);
}

.value-icon {
    color: var(--line-green);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.value-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.value-card p {
    color: var(--text-secondary);
}

.value-card p strong {
    color: var(--line-green);
    font-weight: 700;
}

.cta-box {
    background-color: var(--off-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.cta-box h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
}

.cta-box p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

/* --------------------
   メッセージボードセクション
-------------------- */
.message-board {
    background-color: var(--off-white);
    position: relative;
}

.interactive-demo {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

.phone-wrapper {
    position: relative;
}

.phone {
    position: relative;
    width: 280px;
    height: 550px;
    background-color: #333;
    border-radius: 36px;
    padding: 8px;
    box-shadow: var(--shadow-lg);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background-color: #fff;
    border-radius: 30px;
    overflow: hidden;
    position: relative;
}

.line-chat {
    display: flex;
    flex-direction: column;
    height: 100%;
    background-color: #F0F0F0;
}

.line-header {
    background-color: var(--line-green);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-sm);
    font-weight: 500;
}

.line-content {
    flex: 1;
    padding: var(--spacing-sm);
    overflow-y: auto;
}

.line-timestamp {
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin: var(--spacing-xs) 0;
}

.line-bubble {
    max-width: 70%;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-xs);
    animation: fadeIn 0.5s;
}

.line-bubble.left {
    background-color: var(--white);
    align-self: flex-start;
    border-top-left-radius: 0;
}

.line-bubble.right {
    background-color: var(--line-green);
    color: var(--white);
    align-self: flex-end;
    border-top-right-radius: 0;
}

.typing-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--white);
    width: 60px;
    height: 30px;
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-xs);
    animation: fadeIn 0.5s;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    background-color: var(--text-muted);
    border-radius: 50%;
    margin: 0 3px;
    animation: typing 1s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-6px);
    }
}

.line-input {
    display: flex;
    padding: var(--spacing-sm);
    background-color: #E0E0E0;
}

.line-input input {
    flex: 1;
    padding: var(--spacing-sm);
    border: none;
    border-radius: var(--border-radius-md);
    margin-right: var(--spacing-xs);
}

.line-input button {
    background-color: var(--line-green);
    color: var(--white);
    border: none;
    padding: 0 var(--spacing-sm);
    border-radius: 50%;
    cursor: pointer;
}

.connection-animation {
    position: relative;
    display: flex;
    align-items: center;
    width: 100px;
    height: 2px;
    background-color: var(--line-green);
}

.connection-dot {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: var(--line-green);
    border-radius: 50%;
}

.connection-dot.start {
    left: 0;
    animation: pulse-dot 1.5s infinite;
}

.connection-dot.end {
    right: 0;
    animation: pulse-dot 1.5s infinite 0.5s;
}

@keyframes pulse-dot {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.5);
        opacity: 0.7;
    }
}

.connection-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.connection-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--white), transparent);
    animation: line-flow 2s linear infinite;
}

@keyframes line-flow {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(200%);
    }
}

.display-wrapper {
    position: relative;
}

.led-display {
    position: relative;
    width: 400px;
    height: 150px;
    background-color: #000;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.led-content {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    position: relative;
}

.led-message {
    color: var(--line-green);
    font-size: var(--font-size-xl);
    font-weight: 700;
    text-align: center;
    animation: blink 2s infinite;
}

@keyframes blink {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.feature-item {
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

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

.feature-item .feature-icon {
    color: var(--line-green);
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

.feature-item h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.feature-item p {
    color: var(--text-secondary);
}

.use-cases {
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.use-cases h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    color: var(--line-green);
}

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

.use-case-item {
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.use-case-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-top: 3px solid var(--line-green);
}

.use-case-icon {
    color: var(--line-green);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.use-case-item p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.security-features {
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.security-features h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    color: var(--line-green);
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.security-item {
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.security-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.security-item i {
    color: var(--line-green);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.security-item p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* --------------------
   サービスセクション
-------------------- */
.services {
    background-color: var(--white);
    position: relative;
}

.service-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.service-card {
    position: relative;
    display: flex;
    gap: var(--spacing-xl);
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.service-number {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: rgba(6, 199, 85, 0.1);
    z-index: 0;
}

.service-content {
    flex: 1;
    z-index: 1;
}

.service-content h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.service-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.service-features {
    margin-bottom: var(--spacing-lg);
}

.service-features li {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.service-features li i {
    color: var(--line-green);
    margin-right: var(--spacing-sm);
}

.service-image {
    flex: 1;
    min-width: 300px;
}

/* --------------------
   お問い合わせセクション
-------------------- */
.contact {
    background-color: var(--off-white);
    position: relative;
}

.contact-wrapper {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.contact-content {
    flex: 1;
    min-width: 300px;
}

.contact-content h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

.contact-content p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

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

.contact-method {
    display: flex;
    align-items: center;
    background-color: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.contact-method:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.contact-method.phone {
    border-left: 4px solid var(--accent-blue);
}

.contact-method.phone i {
    color: var(--accent-blue);
}

.contact-method.line {
    border-left: 4px solid var(--line-green);
}

.contact-method.line i {
    color: var(--line-green);
}

.contact-method i {
    font-size: var(--font-size-2xl);
    margin-right: var(--spacing-md);
}

.contact-method span {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.contact-method strong {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.contact-form-container {
    flex: 1;
    min-width: 300px;
}

.contact-form {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.form-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.form-header h3 {
    font-size: var(--font-size-2xl);
    color: var(--line-green);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
    transition: border-color var(--transition-normal);
}

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

.consent-group {
    display: flex;
    align-items: center;
}

.checkbox-container {
    position: relative;
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    height: 20px;
    width: 20px;
    background-color: var(--light-gray);
    border-radius: var(--border-radius-sm);
    margin-right: var(--spacing-sm);
    position: relative;
    transition: background-color var(--transition-normal);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--line-green);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 7px;
    top: 3px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.consent-text {
    font-size: var(--font-size-sm);
}

.consent-text a {
    color: var(--line-green);
    text-decoration: underline;
}

/* --------------------
   フッター
-------------------- */
.footer {
    background-color: var(--black);
    color: var(--text-light);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-info {
    flex: 2;
    min-width: 300px;
}

.footer-info h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--line-green);
}

.footer-info p {
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.contact-info {
    margin-bottom: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.contact-item i {
    color: var(--line-green);
    margin-right: var(--spacing-sm);
}

.contact-item a {
    color: var(--text-light);
}

.contact-item a:hover {
    color: var(--line-green);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-light);
    transition: all var(--transition-normal);
}

.social-icon:hover {
    transform: translateY(-5px);
}

.social-icon.twitter:hover {
    background-color: #1DA1F2;
}

.social-icon.facebook:hover {
    background-color: #4267B2;
}

.social-icon.instagram:hover {
    background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
}

.social-icon.youtube:hover {
    background-color: #FF0000;
}

.social-icon.line:hover {
    background-color: var(--line-green);
}

.footer-links {
    flex: 1;
    min-width: 200px;
}

.footer-links h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.footer-links ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-links ul li a {
    color: var(--text-muted);
    transition: color var(--transition-normal);
}

.footer-links ul li a:hover {
    color: var(--line-green);
}

.footer-newsletter {
    flex: 1;
    min-width: 250px;
}

.footer-newsletter h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.footer-newsletter p {
    margin-bottom: var(--spacing-md);
    color: var(--text-muted);
}

.newsletter-form {
    display: flex;
}

.newsletter-form input {
    flex: 1;
    padding: var(--spacing-sm);
    border: none;
    border-radius: var(--border-radius-md) 0 0 var(--border-radius-md);
    font-size: var(--font-size-sm);
}

.newsletter-form input:focus {
    outline: none;
}

.copyright {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* --------------------
   フローティングCTA
-------------------- */
.floating-cta {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 999;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-normal);
}

.floating-cta.visible {
    opacity: 1;
    transform: translateY(0);
}

.floating-cta .btn {
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) var(--spacing-md);
}

.floating-cta .btn i {
    margin-right: var(--spacing-xs);
}

/* --------------------
   アニメーション
-------------------- */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* --------------------
   レスポンシブデザイン
-------------------- */
@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 3.5rem;
        --font-size-4xl: 2.5rem;
        --font-size-3xl: 2rem;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-features {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .interactive-demo {
        justify-content: center;
    }
    
    .led-display {
        width: 350px;
    }
    
    .service-card {
        flex-direction: column;
    }
    
    .service-content {
        order: 2;
    }
    
    .service-image {
        order: 1;
        margin-bottom: var(--spacing-md);
    }
    
    .contact-wrapper {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 4rem;
        --font-size-5xl: 3rem;
        --font-size-4xl: 2.25rem;
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.5rem;
    }
    
    .nav {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: var(--white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        z-index: 1000;
    }
    
    .nav.active {
        display: flex;
    }
    
    .nav-list {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-link {
        font-size: var(--font-size-xl);
        padding: var(--spacing-md) 0;
    }
    
    .header-cta {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero-features {
        flex-direction: column;
        align-items: center;
    }
    
    .feature-card {
        width: 100%;
        max-width: 300px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .dual-structure {
        flex-direction: column;
    }
    
    .structure-plus,
    .structure-equals {
        transform: rotate(90deg);
        margin: var(--spacing-xs) 0;
    }
    
    .value-cards {
        grid-template-columns: 1fr;
    }
    
    .interactive-demo {
        flex-direction: column;
    }
    
    .connection-animation {
        width: 2px;
        height: 50px;
        margin: var(--spacing-md) 0;
    }
    
    .connection-dot.start {
        top: 0;
        left: 50%;
        transform: translateX(-50%);
    }
    
    .connection-dot.end {
        bottom: 0;
        top: auto;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
    }
    
    @keyframes pulse-dot {
        0%, 100% {
            transform: translateX(-50%) scale(1);
            opacity: 1;
        }
        50% {
            transform: translateX(-50%) scale(1.5);
            opacity: 0.7;
        }
    }
    
    .connection-line {
        width: 100%;
        height: 100%;
    }
    
    .connection-line::after {
        top: -100%;
        left: 0;
        width: 100%;
        height: 100%;
        animation: line-flow-vertical 2s linear infinite;
    }
    
    @keyframes line-flow-vertical {
        0% {
            transform: translateY(0);
        }
        100% {
            transform: translateY(200%);
        }
    }
    
    .feature-grid,
    .use-case-grid,
    .security-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --font-size-xl: 1.1rem;
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .floating-cta .btn span {
        display: none;
    }
    
    .floating-cta .btn i {
        margin-right: 0;
    }
    
    .led-display {
        width: 300px;
        height: 120px;
    }
    
    .led-message {
        font-size: var(--font-size-lg);
    }
    
    .contact-method {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .contact-method i {
        margin-right: 0;
        margin-bottom: var(--spacing-sm);
    }
    
    .social-links {
        justify-content: center;
    }
}
.contact-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
    width: 100%;
}

    .contact-buttons .btn {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 1rem 1.5rem;
        width: 100%;
        font-weight: 500;
        transition: all 0.3s ease;
    }

        .contact-buttons .btn i {
            margin-right: 0.5rem;
            font-size: 1.2rem;
        }

    .contact-buttons .btn-line {
        background-color: #06C755;
        color: white;
        border: none;
    }

        .contact-buttons .btn-line:hover {
            background-color: #05a648;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(6, 199, 85, 0.3);
        }

@media (min-width: 768px) {
    .contact-buttons {
        flex-direction: row;
    }
}

/* Active menu style */
.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

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