/* ===========================
   海の塩と、乾いた心 - 小説風LP
   ミニマル・スタイリッシュ・縦書き
   トンマナ: #0b73c1 (単色ベース)
   =========================== */

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

:root {
    /* カラーパレット - #0b73c1を起点とした明度差のみ */
    --primary: #0b73c1;
    --primary-80: #3c8fc9;
    --primary-60: #6dabd6;
    --primary-40: #9dc7e3;
    --primary-20: #cee3f0;
    --primary-10: #e6f0f8;
    --primary-05: #f2f8fc;
    
    /* デメリット・ネガティブ用（同トーンの赤） */
    --danger: #c1400b;
    --danger-light: #f8e6e6;
    
    --text-main: #333333;
    --text-sub: #666666;
    --text-light: #999999;
    
    --bg-white: #ffffff;
    --border-line: #e6f0f8;
    
    /* タイポグラフィ - 明朝体 */
    --font-serif: 'Noto Serif JP', 'Yu Mincho', 'YuMincho', 'Hiragino Mincho ProN', serif;
    --font-sans: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;
    
    /* スペーシングルール（統一） */
    --section-padding: 80px 0;
    --container-padding: 0 24px;
    --max-width: 680px;
    
    /* ブロック共通ルール */
    --block-padding: 0;
    --block-margin: 48px 0;
    --block-bg: transparent;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-serif);
    color: var(--text-main);
    line-height: 2.4;
    background: linear-gradient(180deg, var(--primary-10) 0%, var(--primary-05) 100%);
    background-attachment: fixed;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* コンテンツラッパー（白背景） */
.chapter,
.cta-section {
    background-color: var(--bg-white);
}

/* ===========================
   見出し共通ルール
   =========================== */
h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.6;
    color: var(--primary);
    margin: 0;
}

h2 {
    font-size: 1.75rem;
    letter-spacing: 0.2em;
}

h3 {
    font-size: 1.1rem;
    letter-spacing: 0.1em;
    margin-bottom: 1.5em;
}

h4 {
    font-size: 0.95rem;
    letter-spacing: 0.05em;
    margin-bottom: 1em;
}

h5 {
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.75em;
}

h6 {
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.5em;
    color: var(--text-sub);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--container-padding);
}

/* リンク以外のホバーを無効化 */
a, button {
    transition: opacity 0.3s ease;
}

a:hover, button:hover {
    opacity: 0.7;
}

/* ===========================
   ヒーローセクション（海のアニメーション）
   =========================== */
.hero {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, var(--primary-10) 0%, var(--primary-20) 50%, var(--primary-40) 100%);
    color: var(--primary);
    position: relative;
    padding: 40px 20px;
    overflow: hidden;
}

/* 波のアニメーション */
.hero::before,
.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 200%;
    height: 200px;
    background: radial-gradient(ellipse at center, var(--primary-20) 0%, transparent 70%);
    border-radius: 50%;
    transform-origin: center bottom;
}

.hero::before {
    animation: wave1 8s ease-in-out infinite;
    opacity: 0.6;
}

.hero::after {
    animation: wave2 10s ease-in-out infinite;
    opacity: 0.4;
}

@keyframes wave1 {
    0%, 100% {
        transform: translateX(-50%) translateY(0) scale(1, 0.8);
    }
    50% {
        transform: translateX(-50%) translateY(-20px) scale(1.1, 1);
    }
}

@keyframes wave2 {
    0%, 100% {
        transform: translateX(-50%) translateY(-10px) scale(1.05, 0.9);
    }
    50% {
        transform: translateX(-50%) translateY(10px) scale(1, 1.1);
    }
}

/* 浮遊する光の粒子 */
.hero .hero-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(255,255,255,0.3) 1px, transparent 1px),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.2) 1px, transparent 1px),
        radial-gradient(circle at 40% 70%, rgba(255,255,255,0.25) 1px, transparent 1px),
        radial-gradient(circle at 70% 60%, rgba(255,255,255,0.15) 1px, transparent 1px);
    background-size: 100px 100px, 150px 150px, 120px 120px, 80px 80px;
    animation: sparkle 6s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes sparkle {
    0%, 100% {
        opacity: 0.5;
        transform: translateY(0);
    }
    50% {
        opacity: 1;
        transform: translateY(-10px);
    }
}

.hero-content {
    width: 100%;
    max-width: 800px;
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 縦書きタイトル配置 */
.hero-title-area {
    display: flex;
    flex-direction: row-reverse;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-bottom: 60px;
}

.hero-title {
    writing-mode: vertical-rl;
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    line-height: 1.6;
    color: var(--primary);
    margin: 0;
    white-space: nowrap;
}

.hero-subtitle {
    writing-mode: vertical-rl;
    font-family: var(--font-serif);
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    line-height: 1.8;
    color: var(--primary-60);
    margin: 0;
    white-space: nowrap;
}

.hero-meta {
    text-align: center;
    margin-top: auto;
}

.product-brand {
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    color: var(--primary);
    margin-bottom: 10px;
    display: block;
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--primary-40);
    text-decoration: none;
}

.hero-scroll span {
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    font-family: var(--font-sans);
}

.hero-scroll i.fas,
.hero-scroll i.fa {
    display: inline-block;
    font-size: 0.8rem;
}

.hero-disclaimer {
    font-size: 0.8rem;
    color: var(--primary-80);
    margin-top: 6px;
}

/* ===========================
   章（Chapter）共通
   =========================== */
.chapter {
    padding: var(--section-padding);
    background-color: var(--bg-white);
    position: relative;
}

/* 縦書き見出し - 遊び心 */
.chapter-header {
    position: relative;
    min-height: 200px; /* 最小高さを確保しつつ、内容に応じて伸長 */
    margin-bottom: 60px;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* 上揃え */
}

.chapter-number {
    writing-mode: vertical-rl;
    font-family: var(--font-serif);
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    color: var(--primary-40);
    position: absolute;
    top: 0;
    right: 50%;
    margin-right: 40px;
}

/* プロローグ・エピローグ用ラベル（タイトルなしの場合は中央配置） */
.chapter-label {
    writing-mode: vertical-rl;
    font-family: var(--font-serif);
    font-size: 1.25rem;
    letter-spacing: 0.2em;
    color: var(--primary);
    font-weight: 500;
    position: static;
    margin: 0 auto;
}

.chapter-title {
    writing-mode: vertical-rl;
    font-family: var(--font-serif);
    font-size: 1.75rem;
    letter-spacing: 0.2em;
    color: var(--primary);
    font-weight: 500;
    line-height: 1.5;
    margin: 0 auto; /* 中央揃え */
}

.chapter-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* ===========================
   本文テキスト
   =========================== */
p {
    margin-bottom: 2em;
    font-size: 1rem;
    text-align: justify;
    text-justify: inter-ideograph;
    color: var(--text-main);
}

.first-letter::first-letter {
    font-size: 2.5em;
    float: left;
    margin: 0.1em 0.3em 0 0;
    color: var(--primary);
    line-height: 1;
}

/* 引用・セリフ - ミニマル */
.story-quote {
    margin: var(--block-margin);
    padding: 0 24px;
    border-left: 2px solid var(--primary-20);
}

.story-quote p {
    font-size: 1.05rem;
    color: var(--primary);
    margin: 0;
    line-height: 2;
}

.dialogue {
    margin: 2em 0;
    padding-left: 24px;
    color: var(--text-sub);
}

/* ===========================
   コンテンツボックス - 統一ルール
   =========================== */
.highlight-box,
.scene-box,
.decision-box,
.wisdom,
.lesson-learned,
.reflection,
.turning-point,
.philosophy-section,
.core-message,
.final-message,
.content-block,
.timeline-content,
.miracle-content,
.realization-content,
.ocean-scene {
    background-color: transparent;
    padding: 0;
    margin: var(--block-margin);
    border: none;
}

/* セクション内h3の装飾（下線付き） */
.chapter-content h3 {
    border-bottom: 1px solid var(--primary-20);
    padding-bottom: 0.75em;
}

/* ===========================
   統計コンポーネント共通
   =========================== */
.stats-box {
    margin: var(--block-margin);
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 32px;
    border-top: 1px solid var(--primary-20);
    border-bottom: 1px solid var(--primary-20);
    padding: 24px 0;
}

.stat-item {
    flex: 0 1 auto;
    min-width: 120px;
    text-align: center;
    padding: 16px 0;
}

/* 数値部分 */
.stat-number {
    display: block;
    font-size: 2rem;
    color: var(--primary);
    font-weight: 400;
    margin-bottom: 8px;
    font-family: var(--font-serif);
    letter-spacing: 0.05em;
}

/* ラベル部分 */
.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
    font-family: var(--font-sans);
    letter-spacing: 0.1em;
}

/* デメリット表示は赤 */
.stats-box.decline .stat-number {
    color: var(--danger);
}

/* アイコンを非表示 */
.stat-item i {
    display: none;
}

/* ===========================
   Before/After コンポーネント
   =========================== */
.transformation-box {
    margin: var(--block-margin);
    border-top: 1px solid var(--primary-20);
    border-bottom: 1px solid var(--primary-20);
    padding: 32px 0;
}

.before-after {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.before, .after {
    padding: 0 24px;
    position: relative;
}

.before {
    border-left: 2px solid var(--danger);
}

.after {
    border-left: 2px solid var(--primary);
}

.before h4, .after h4 {
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    margin-bottom: 1em;
    font-weight: 400;
}

.before h4 {
    color: var(--danger);
}

.after h4 {
    color: var(--primary);
}

.before p, .after p {
    font-size: 0.9rem;
    line-height: 1.8;
    margin: 0;
    text-indent: 0;
}

/* 矢印は非表示 */
.arrow {
    display: none;
}

/* モバイル対応 */
@media (max-width: 767px) {
    .before-after {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* ===========================
   CTAセクション
   =========================== */
.cta-section {
    padding: 120px 0;
    background-color: var(--bg-white);
    text-align: center;
}

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

.cta-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--text-main);
    margin-bottom: 40px;
    font-weight: 500;
    letter-spacing: 0.1em;
}

.cta-description {
    font-size: 0.9rem;
    color: var(--text-sub);
    margin-bottom: 60px;
}

.main-cta-button {
    display: inline-block;
    border: 1px solid var(--primary);
    background: transparent;
    color: var(--primary);
    padding: 16px 48px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-decoration: none;
    border-radius: 0; /* 角丸なし */
    transition: all 0.3s ease;
}

.main-cta-button:hover {
    background: var(--primary);
    color: #fff;
    opacity: 1; /* hover opacity override */
}

.cta-button-icon {
    display: none; /* アイコン削除でミニマルに */
}

.cta-note {
    margin-top: 20px;
    font-size: 0.7rem;
    color: var(--text-light);
}

.epilogue-image-reveal {
    margin: var(--block-margin);
    width: 100%;
}

.epilogue-image-reveal-inner {
    width: 100%;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 16px 40px rgba(11, 115, 193, 0.18);
    border: 1px solid var(--primary-20);
    background: var(--bg-white);
}

.epilogue-image-reveal img {
    display: block;
    width: 100%;
    height: auto;
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 1.1s ease, transform 1.1s cubic-bezier(0.2, 0.7, 0.2, 1);
    will-change: transform, opacity;
}

.epilogue-image-reveal.is-visible img {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   フッター
   =========================== */
.footer {
    padding: 80px 0;
    background-color: var(--bg-white);
    border-top: 1px solid var(--border-line);
    text-align: center;
}

.footer-quote p {
    font-family: var(--font-serif);
    font-size: 1rem;
    color: var(--primary);
    margin-bottom: 30px;
    letter-spacing: 0.2em;
}

.footer-text p {
    font-size: 0.8rem;
    color: var(--text-light);
    margin: 5px 0;
    font-family: var(--font-sans);
}

/* ===========================
   その他
   =========================== */
.scroll-top {
    position: fixed;
    right: 18px;
    bottom: 18px;
    width: 46px;
    height: 46px;
    border-radius: 999px;
    border: 1px solid var(--primary-20);
    background: rgba(255, 255, 255, 0.92);
    color: var(--primary);
    box-shadow: 0 10px 26px rgba(11, 115, 193, 0.18);
    display: grid;
    place-items: center;

    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity 0.25s ease, transform 0.25s ease;
    z-index: 9999;
}

.scroll-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.themes, .hero-overlay, .wave-animation, .hero-product,
.chapter-image, .image-placeholder, .image-caption,
.timeline-icon, .challenge-icon, .miracle-date,
.turning-point-icon, .scene-image, .arrow,
.quote-icon,
.story-quote i,
.content-block h3 i,
.timeline-content h3 i,
.miracle-content h3 i,
.realization-content h3 i,
.ocean-scene h3 i,
.philosophy-section h3 i,
.lesson-learned i,
.support-item i,
.breakthrough-result i,
.cta-button-icon {
    display: none;
}

/* ===========================
   レスポンシブ (SP最適化済みだが微調整)
   =========================== */
@media (max-width: 767px) {
    :root {
        --section-padding: 60px 0;
        --block-padding: 24px;
        --block-margin: 32px 0;
    }
    
    .hero-title-area {
        gap: 16px;
    }
    
    .hero-title {
        font-size: 1.5rem;
        letter-spacing: 0.1em;
    }
    
    .hero-subtitle {
        font-size: 0.75rem;
        letter-spacing: 0.08em;
    }
    
    .chapter-header {
        min-height: 140px;
        margin-bottom: 32px;
    }
    
    .chapter-title {
        font-size: 1.25rem;
    }
    
    .chapter-number {
        margin-right: 30px;
        font-size: 0.8rem;
    }
    
    .stat-item, .growth-item, .struggle-item {
        min-width: 100%;
        padding: 12px;
    }
    
    .stat-number,
    .growth-number {
        font-size: 2rem;
    }
    
    .cta-section {
        padding: 80px 0;
    }
    
    .cta-title {
        font-size: 1.25rem;
    }
}