/* ==================== 基本設定 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #5B8C8E;
    --secondary-color: #E8F2F2;
    --accent-color: #F4A460;
    --text-dark: #2C3E50;
    --text-light: #6C7A89;
    --bg-light: #F8FAFA;
    --white: #FFFFFF;
    --border-color: #DDE5E9;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-light);
    line-height: 1.8;
    font-size: 16px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== ファーストビュー ==================== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #4A7375 100%);
    color: var(--white);
    padding: 80px 20px 60px;
    text-align: center;
}

.hero-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 30px;
    line-height: 1.5;
}

.hero-subtitle {
    font-size: 16px;
    margin-bottom: 30px;
    opacity: 0.95;
}

.hero-subtitle p {
    margin-bottom: 10px;
}

.pattern-list {
    list-style: none;
    margin: 15px 0;
    display: inline-block;
    text-align: left;
}

.pattern-list li {
    padding: 8px 0;
    position: relative;
    padding-left: 20px;
}

.pattern-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.notice-box {
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    padding: 20px;
    max-width: 400px;
    margin: 0 auto;
    backdrop-filter: blur(10px);
}

.notice-list {
    list-style: none;
    text-align: center;
}

.notice-list li {
    padding: 5px 0;
    font-weight: 500;
}

/* ==================== 登場人物 ==================== */
.characters {
    padding: 60px 20px;
    background-color: var(--white);
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-dark);
}

.character-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.character-card {
    background-color: var(--bg-light);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.character-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
}

.character-icon.customer {
    background: linear-gradient(135deg, #6C8EAD 0%, #5B7A9A 100%);
}

.character-icon.you {
    background: linear-gradient(135deg, var(--primary-color) 0%, #4A7375 100%);
}

.character-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.character-info p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ==================== パターンセクション ==================== */
.patterns {
    padding: 60px 20px;
    background-color: var(--bg-light);
}

.tab-navigation {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    background-color: var(--white);
    border: 2px solid var(--border-color);
    color: var(--text-dark);
    padding: 12px 24px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Noto Sans JP', sans-serif;
}

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

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

.pattern-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.pattern-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.pattern-header {
    background-color: var(--white);
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

.pattern-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.pattern-desc {
    font-size: 15px;
    color: var(--text-light);
}

/* ==================== STEPセクション ==================== */
.step-section {
    margin-bottom: 40px;
}

.step-label {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 12px 20px;
    border-radius: 8px 8px 0 0;
    font-weight: 700;
    font-size: 16px;
}

.chat-container {
    background-color: var(--white);
    border-radius: 0 0 16px 16px;
    padding: 30px 20px;
    box-shadow: var(--shadow);
}

.message {
    display: flex;
    margin-bottom: 20px;
    animation: slideIn 0.4s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.you-message {
    justify-content: flex-end;
}

.customer-message {
    justify-content: flex-start;
}

.message-bubble {
    max-width: 75%;
    padding: 16px 20px;
    border-radius: 20px;
    line-height: 1.7;
    font-size: 15px;
    position: relative;
}

.you-message .message-bubble {
    background: linear-gradient(135deg, var(--primary-color) 0%, #4A7375 100%);
    color: var(--white);
    border-bottom-right-radius: 4px;
}

.customer-message .message-bubble {
    background-color: #F0F4F7;
    color: var(--text-dark);
    border-bottom-left-radius: 4px;
}

.step-explanation {
    background-color: var(--secondary-color);
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    margin-top: 20px;
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-dark);
}

.step-explanation strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: 8px;
}

/* ==================== パターンノート ==================== */
.pattern-note {
    background-color: #FFF8F0;
    border-left: 4px solid var(--accent-color);
    padding: 20px;
    margin-top: 30px;
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.8;
}

.pattern-note strong {
    color: var(--accent-color);
    display: block;
    margin-bottom: 8px;
}

/* ==================== パターン移動ナビゲーション ==================== */
.pattern-navigation {
    display: flex;
    gap: 15px;
    margin-top: 40px;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-btn {
    flex: 1;
    min-width: 200px;
    max-width: 300px;
    background-color: var(--white);
    border: 2px solid var(--primary-color);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Noto Sans JP', sans-serif;
    text-align: left;
}

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

.nav-btn:hover .nav-label {
    color: rgba(255, 255, 255, 0.9);
}

.nav-btn:hover .nav-title {
    color: var(--white);
}

.nav-label {
    display: block;
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 5px;
    transition: color 0.3s ease;
}

.nav-title {
    display: block;
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    transition: color 0.3s ease;
}


/* ==================== 共通ルール ==================== */
.rules {
    padding: 60px 20px;
    background-color: var(--white);
}

.rules-list {
    list-style: none;
    max-width: 600px;
    margin: 0 auto 30px;
}

.rules-list li {
    background-color: var(--bg-light);
    padding: 18px 24px;
    margin-bottom: 12px;
    border-radius: 12px;
    border-left: 4px solid #E74C3C;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-dark);
}

.rules-note {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--secondary-color);
    border-radius: 12px;
    text-align: center;
    font-size: 16px;
}

.rules-note strong {
    color: var(--primary-color);
}

/* ==================== まとめ ==================== */
.summary {
    padding: 60px 20px;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--bg-light) 100%);
}

.summary-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-dark);
}

.summary-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    max-width: 900px;
    margin: 0 auto 30px;
}

.summary-point {
    background-color: var(--white);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.summary-point:hover {
    transform: translateY(-4px);
}

.point-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #4A7375 100%);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 15px;
}

.point-text {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-dark);
}

.summary-footer {
    text-align: center;
    font-size: 14px;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
    padding: 20px;
}

/* ==================== フッター ==================== */
.footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding: 30px 20px;
    text-align: center;
}

.footer p {
    font-size: 14px;
    opacity: 0.8;
}

/* ==================== レスポンシブ対応 ==================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 26px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

    .section-title {
        font-size: 24px;
    }

    .pattern-title {
        font-size: 20px;
    }

    .tab-btn {
        font-size: 14px;
        padding: 10px 18px;
    }

    .message-bubble {
        max-width: 85%;
        font-size: 14px;
    }

    .character-cards {
        grid-template-columns: 1fr;
    }

    .summary-points {
        grid-template-columns: 1fr;
    }

    .pattern-navigation {
        flex-direction: column;
    }

    .nav-btn {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 15px 40px;
    }

    .hero-title {
        font-size: 22px;
    }

    .tab-navigation {
        flex-direction: column;
        align-items: stretch;
    }

    .tab-btn {
        width: 100%;
    }

    .message-bubble {
        max-width: 90%;
        font-size: 14px;
        padding: 14px 16px;
    }
}