/* =========================================================
   全ページ共通のデザイントークンと土台
   個別ページで値を直書きせず、必ずここの変数を使うこと
   ========================================================= */
:root {
    --sky-blue: #4A90E2;
    --deep-sky: #2C5AA0;
    --hero-sky-light: #BCEBFB;
    --hero-sky: #76C9EF;
    --hero-sky-deep: #4AA9DE;
    --cloud-white: #F0F4F8;
    --ai-cyan: #00D9FF;
    --ai-purple: #A855F7;
    --interactive: #2C5AA0;
    --interactive-hover: #1D4E85;
    --accent-purple-text: #7130A6;
    --accent-surface: #EAF4FF;
    --text-on-dark: #FFFFFF;
    --text-on-dark-muted: #E8F3FC;
    --text-on-sky: #102A4C;
    --text-dark: #1A202C;
    --text-body: #475569;
    --text-light: #64748B;
    --success: #19734D;
    --caution: #A54242;
    /* 画面幅を活かすための共通シェル */
    --shell-max: 1500px;
    --shell-gutter: clamp(1.25rem, 4vw, 4rem);
    /* 固定ヘッダー分のアンカーオフセット */
    --header-offset: 90px;
    /* カード・パネルの共通スタイル */
    --card-radius: 24px;
    --card-border: 1px solid rgba(74, 144, 226, 0.12);
    --card-shadow: 0 12px 40px rgba(35, 79, 142, 0.1);
    --card-shadow-hover: 0 22px 60px rgba(35, 79, 142, 0.2);
    --panel-radius: 40px;
    --accent-line-radius: 999px;
    --accent-line-shadow: 0 0 10px rgba(74, 144, 226, 0.5);
}

html {
    scroll-behavior: smooth;
}

/* Bootstrapのcontainerを全ブレークポイントで広く使う */
.container {
    width: 100%;
    max-width: var(--shell-max);
    padding-right: var(--shell-gutter);
    padding-left: var(--shell-gutter);
}

/* 全ページ共通の背景（空をイメージしたグラデーション） */
body {
    position: relative;
    min-height: 100vh;
    margin: 0;
    /* hidden にするとbodyがスクロールコンテナ扱いになり、
       ヘッダーの position: sticky が効かなくなるため clip を使う */
    overflow-x: clip;
    color: var(--text-dark);
    background: linear-gradient(135deg, var(--hero-sky-light) 0%, var(--hero-sky) 50%, var(--hero-sky-deep) 100%);
    background-attachment: fixed;
    font-family: 'Noto Sans JP', sans-serif;
}

/* ゆっくり流れる雲 */
body::before {
    position: fixed;
    z-index: 0;
    /* アニメーションで移動しても画面端にレイヤーの境界が露出しないよう、
       最大移動量（30px）より一回り大きく広げる */
    inset: -40px;
    content: '';
    pointer-events: none;
    background:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.2) 0%, transparent 50%);
    animation: cloudFloat 20s ease-in-out infinite;
}

/* 薄いグリッドパターン */
body::after {
    position: fixed;
    z-index: 0;
    inset: 0;
    content: '';
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

@keyframes cloudFloat {
    0%, 100% {
        transform: translateX(0) translateY(0);
        opacity: 1;
    }
    50% {
        transform: translateX(30px) translateY(-20px);
        opacity: 0.8;
    }
}

/* 全ページ共通のスクロールバー */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    border-radius: 6px;
    background: linear-gradient(180deg, var(--sky-blue), var(--ai-cyan));
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--deep-sky), var(--sky-blue));
}

/* 全ページ共通の本文コンテナ（ヒーローに重なる白いパネル） */
.main-container,
.policy-main {
    position: relative;
    z-index: 2;
    margin-top: -60px;
    padding: clamp(3.5rem, 6vw, 6rem) 0;
    background: linear-gradient(180deg, rgba(240, 244, 248, 0.95) 0%, rgba(255, 255, 255, 0.98) 100%);
    border-radius: var(--panel-radius) var(--panel-radius) 0 0;
    box-shadow: 0 -10px 50px rgba(35, 79, 142, 0.2);
    backdrop-filter: blur(10px);
}

.main-container::before,
.policy-main::before {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 3px;
    content: '';
    background: linear-gradient(90deg, transparent, var(--ai-cyan), var(--sky-blue), var(--ai-purple), transparent);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* 全ページで共通にするヘッダー（スクロールしても上端に留まる） */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    line-height: 1.5;
    background: rgba(255, 255, 255, 0.9) !important;
    border: 0;
    box-shadow: 0 4px 30px rgba(74, 144, 226, 0.1);
    backdrop-filter: blur(20px);
    transition: all 0.3s ease;
}

.navbar::before {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    content: '';
    background: linear-gradient(90deg, var(--ai-cyan), var(--sky-blue), var(--ai-purple));
    opacity: 0.5;
}

.navbar-brand {
    position: relative;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--deep-sky), var(--interactive-hover), var(--accent-purple-text));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.navbar-brand::after {
    position: absolute;
    top: -5px;
    right: -25px;
    color: var(--ai-cyan);
    font-size: 0.6rem;
    content: '✦';
    animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.nav-link {
    position: relative;
    padding: 0.5rem 1rem !important;
    color: var(--text-dark) !important;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-link::before {
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    content: '';
    background: linear-gradient(90deg, var(--sky-blue), var(--ai-cyan));
    transform: translateX(-50%);
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link:focus {
    color: var(--interactive-hover) !important;
    transform: translateY(-2px);
}

.nav-link:hover::before,
.nav-link:focus::before {
    width: 80%;
}

.dropdown-menu {
    padding: 0.6rem;
    border: 1px solid rgba(74, 144, 226, 0.14);
    border-radius: 14px;
    box-shadow: 0 14px 38px rgba(35, 79, 142, 0.14);
}

.dropdown-item {
    padding: 0.65rem 0.8rem;
    border-radius: 9px;
    color: var(--text-dark);
}

.dropdown-item:hover,
.dropdown-item:focus {
    color: var(--deep-sky);
    background: rgba(74, 144, 226, 0.09);
}

/* 全ページで共通にするフッター */
footer {
    position: relative;
    z-index: 2;
    margin-top: 60px;
    padding: 3rem 0;
    color: var(--text-light);
    background: rgba(255, 255, 255, 0.95);
    border-top: 1px solid rgba(74, 144, 226, 0.2);
    text-align: center;
    line-height: 1.5;
    backdrop-filter: blur(10px);
}

footer::before {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 2px;
    content: '';
    background: linear-gradient(90deg, transparent, var(--ai-cyan), var(--sky-blue), var(--ai-purple), transparent);
}

footer p {
    margin-bottom: 0;
    font-weight: 300;
    letter-spacing: 1px;
}

footer a {
    color: var(--deep-sky);
    text-decoration: none;
}

footer a:hover,
footer a:focus {
    color: var(--interactive-hover);
    text-decoration: underline;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem 1.1rem;
    justify-content: center;
}

/* 方針・規約ページ（背景・本文コンテナは共通定義を使う） */
body.policy-page {
    line-height: 1.9;
}

.policy-hero {
    position: relative;
    z-index: 1;
    padding: 130px 0 90px;
    color: var(--text-on-sky);
    text-align: center;
}

.policy-hero h1 {
    margin-bottom: 1rem;
    font-size: clamp(2.4rem, 7vw, 4.2rem);
    font-weight: 700;
    letter-spacing: 0.12em;
    text-shadow: none;
}

.policy-hero p {
    max-width: 760px;
    margin: 0 auto;
    font-size: clamp(1rem, 2.4vw, 1.25rem);
    font-weight: 300;
    letter-spacing: 0.04em;
    color: var(--text-on-sky);
    text-shadow: none;
}

/* 目次サイドバー + 本文の2カラム */
.policy-layout {
    display: grid;
    gap: clamp(1.5rem, 3vw, 3rem);
    align-items: start;
}

@media (min-width: 1200px) {
    .policy-layout {
        grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
    }

    .policy-side {
        position: sticky;
        top: var(--header-offset);
        max-height: calc(100vh - var(--header-offset) - 2rem);
        overflow-y: auto;
        overscroll-behavior: contain;
    }
}

/* 本文は読みやすい行長を保つ */
.policy-layout > .policy-list,
.policy-layout > .policy-stack {
    max-width: 1080px;
    min-width: 0;
}

/* 目次を持たないページも本文幅は同じに揃える */
.policy-main > .container:not(.policy-layout) > .policy-list,
.policy-main > .container:not(.policy-layout) > .policy-stack {
    max-width: 1080px;
    margin-right: auto;
    margin-left: auto;
}

.policy-list {
    gap: 1.5rem;
}

.policy-list > .card,
.policy-stack > .card {
    scroll-margin-top: calc(var(--header-offset) + 1rem);
}

.policy-nav {
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.85);
    border: var(--card-border);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
}

.policy-nav-title {
    display: flex;
    gap: 0.55rem;
    align-items: center;
    margin-bottom: 0.9rem;
    color: var(--deep-sky);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.06em;
}

.policy-list > .card,
.policy-stack > .card {
    overflow: hidden;
    border: var(--card-border);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
}

.policy-list > .card .card-body {
    padding: clamp(1.5rem, 4vw, 2.5rem);
}

.section-heading {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 1.3rem;
    color: var(--deep-sky);
    font-size: clamp(1.35rem, 3vw, 1.75rem);
    font-weight: 700;
}

.section-heading i {
    width: 2.3rem;
    text-align: center;
}

.summary-card,
.lead-card {
    border: 2px solid rgba(74, 144, 226, 0.25) !important;
}

.summary-column {
    height: 100%;
    padding: 1.5rem;
    border-radius: 16px;
}

.summary-do {
    background: rgba(25, 115, 77, 0.07);
    border: 1px solid rgba(25, 115, 77, 0.18);
}

.summary-dont {
    background: rgba(165, 66, 66, 0.07);
    border: 1px solid rgba(165, 66, 66, 0.18);
}

.summary-info {
    background: rgba(74, 144, 226, 0.08);
    border: 1px solid rgba(74, 144, 226, 0.2);
}

.summary-note {
    background: rgba(168, 85, 247, 0.07);
    border: 1px solid rgba(143, 63, 209, 0.18);
}

.summary-title {
    margin-bottom: 1rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.summary-do .summary-title {
    color: var(--success);
}

.summary-dont .summary-title {
    color: var(--caution);
}

.summary-info .summary-title {
    color: var(--deep-sky);
}

.summary-note .summary-title {
    color: var(--accent-purple-text);
}

.policy-points {
    margin-bottom: 0;
    padding-left: 1.3rem;
}

.policy-points li + li {
    margin-top: 0.65rem;
}

.policy-page h3 {
    color: var(--deep-sky);
}

.definition-list {
    margin: 0;
}

.definition-list dt {
    margin-top: 1.1rem;
    color: var(--deep-sky);
    font-size: 1.05rem;
}

.definition-list dt:first-child {
    margin-top: 0;
}

.definition-list dd {
    margin: 0.35rem 0 0;
    color: inherit;
}

.source-note a,
.reference-list a {
    color: var(--bs-link-color);
    font-weight: 500;
}

.reference-list {
    margin: 0;
    padding-left: 1.3rem;
}

.reference-list li + li {
    margin-top: 0.9rem;
}

.reference-meta {
    display: block;
    color: var(--text-light);
    font-size: 0.9rem;
}

.policy-page a {
    overflow-wrap: anywhere;
}

.policy-toc {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.4rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.policy-toc a {
    display: flex;
    gap: 0.6rem;
    align-items: baseline;
    height: 100%;
    padding: 0.55rem 0.75rem;
    color: var(--deep-sky);
    border-left: 3px solid transparent;
    border-radius: 0 10px 10px 0;
    font-size: 0.92rem;
    line-height: 1.6;
    text-decoration: none;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.policy-toc a::before {
    flex: none;
    content: counter(policy-toc-item, decimal-leading-zero);
    color: var(--interactive);
    font-variant-numeric: tabular-nums;
    font-size: 0.75rem;
    font-weight: 700;
    opacity: 1;
}

.policy-toc li {
    counter-increment: policy-toc-item;
}

.policy-toc {
    counter-reset: policy-toc-item;
}

.policy-toc a:hover,
.policy-toc a:focus {
    background: rgba(74, 144, 226, 0.1);
    border-left-color: var(--sky-blue);
}

.source-note,
.notice-box {
    margin-top: 1rem;
    padding: 1rem 1.2rem;
    color: inherit;
    background: var(--cloud-white);
    border-left: 4px solid var(--sky-blue);
    border-radius: 0 10px 10px 0;
    font-size: 0.95rem;
}

.notice-box.caution {
    background: rgba(165, 66, 66, 0.07);
    border-left-color: var(--caution);
}

.data-table {
    margin-bottom: 0;
}

.data-table th {
    min-width: 8rem;
    color: var(--deep-sky);
    background: rgba(74, 144, 226, 0.07);
}

.policy-meta {
    color: var(--text-light);
    font-size: 0.92rem;
    text-align: right;
}

.contact-link {
    display: inline-flex;
    gap: 0.5rem;
    align-items: center;
    padding: 0.7rem 1rem;
    color: var(--text-on-dark) !important;
    background: linear-gradient(135deg, var(--interactive), var(--interactive-hover));
    border-radius: 10px;
    text-decoration: none;
}

.contact-link:hover,
.contact-link:focus {
    color: var(--text-on-dark) !important;
    box-shadow: 0 8px 20px rgba(35, 79, 142, 0.2);
}

@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.5rem;
    }

    .policy-hero {
        padding: 95px 1rem 70px;
    }

    .policy-hero h1 {
        letter-spacing: 0.06em;
    }

    .main-container,
    .policy-main {
        border-radius: 30px 30px 0 0;
    }

    .policy-meta {
        text-align: left;
    }

    .data-table,
    .data-table tbody,
    .data-table tr,
    .data-table th,
    .data-table td {
        display: block;
        width: 100%;
    }

    .data-table tr + tr {
        margin-top: 1rem;
    }
}

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