/* ==========================================================================
   英星土木工業株式会社 - スタイルシート (style.css)
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. 変数定義 & リセット
   -------------------------------------------------------------------------- */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #121212;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.4);
    --accent-color: #c5a880; /* コッパーゴールド */
    --accent-hover: #b3946a;
    --border-color: rgba(255, 255, 255, 0.1);
    --font-sans: 'Noto Sans JP', sans-serif;
    --font-serif: 'Noto Serif JP', serif;
    --header-height: 80px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
}

body {
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

body.menu-open {
    overflow: hidden; /* スマホメニュー表示時に背景スクロールを止める */
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

ul, ol {
    list-style: none;
}

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

/* --------------------------------------------------------------------------
   1. 共通パーツ & ボタン
   -------------------------------------------------------------------------- */
/* 表示制御ユーティリティ */
.sp-only {
    display: none !important;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 4%;
}

.section {
    padding: 140px 0;
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 900;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    letter-spacing: 0.1em;
}

.section-title::after {
    content: attr(data-en);
    display: block;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--accent-color);
    font-weight: 500;
    letter-spacing: 0.3em;
    margin-top: 10px;
    text-transform: uppercase;
}

.section-title.align-left {
    text-align: left;
}

.section-title.align-left::after {
    margin-left: 0;
}

.section-lead {
    text-align: center;
    max-width: 800px;
    margin: -20px auto 80px;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ボタン */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-weight: 700;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    font-size: 0.95rem;
    letter-spacing: 0.05em;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #000;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(197, 168, 128, 0.3);
}

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

.btn-secondary:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background-color: rgba(255, 255, 255, 0.02);
}

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

.btn-outline:hover {
    background-color: var(--text-primary);
    color: #000;
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.05rem;
    width: 100%;
}

.section-more {
    text-align: center;
    margin-top: 60px;
}

/* --------------------------------------------------------------------------
   2. ヘッダー
   -------------------------------------------------------------------------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    transition: var(--transition-smooth);
}

.header-container {
    height: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 4%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo a {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    line-height: 1.1;
}

.header-logo-mark {
    height: 57px;
    width: auto;
}

/* 診断ツールと同等のテキストロゴスタイル */
.site-logo-text {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    line-height: 1.1;
}

.site-logo-text-sub {
    font-family: 'Outfit', sans-serif;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.15em;
    color: #FFC400; /* 診断ツールのアクセントイエロー */
    line-height: 1;
    margin-bottom: 2px;
}

.site-logo-text-main {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 16px;
    font-weight: 900;
    letter-spacing: 0.05em;
    color: #F5F5F5; /* 診断ツールのテキストプライマリ */
    line-height: 1;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--text-primary);
    letter-spacing: 0.1em;
}

.logo-sub {
    font-size: 0.65rem;
    color: var(--accent-color);
    letter-spacing: 0.4em;
    font-weight: 500;
    margin-top: 2px;
}

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

.header-nav li {
    margin-left: 20px;
}

.header-nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.header-nav a:hover,
.header-nav a.active {
    color: var(--accent-color);
}

.header-nav .nav-contact-btn {
    background-color: var(--accent-color);
    color: #000;
    padding: 8px 16px;
    border-radius: 4px;
    font-weight: 700;
}

.header-nav .nav-contact-btn:hover {
    background-color: var(--accent-hover);
    color: #000;
}

.header-nav .nav-admin-btn {
    border: 1px solid var(--text-secondary);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.8rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
    transition: var(--transition-smooth);
}

.header-nav .nav-admin-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background-color: rgba(255, 255, 255, 0.02);
}

/* スマホ用ハンバーガーボタン */
.menu-trigger {
    background: none;
    border: none;
    width: 30px;
    height: 24px;
    position: relative;
    cursor: pointer;
    z-index: 110;
}

.menu-trigger span {
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    left: 0;
    transition: var(--transition-smooth);
}

.menu-trigger span:nth-child(1) { top: 0; }
.menu-trigger span:nth-child(2) { top: 11px; }
.menu-trigger span:nth-child(3) { top: 22px; }

.menu-trigger[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(11px) rotate(45deg);
    background-color: var(--accent-color);
}
.menu-trigger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}
.menu-trigger[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-11px) rotate(-45deg);
    background-color: var(--accent-color);
}

/* --------------------------------------------------------------------------
   3. スマホ用ナビゲーション
   -------------------------------------------------------------------------- */
.sp-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 400px;
    height: 100vh;
    background-color: var(--bg-secondary);
    z-index: 105;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
    border-left: 1px solid var(--border-color);
}

.sp-nav.is-open {
    right: 0;
}

.sp-nav-inner {
    height: 100%;
    padding: 30px 40px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow-y: auto;
}

.sp-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.sp-logo {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 900;
    color: var(--text-primary);
}

.menu-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.8rem;
    cursor: pointer;
}

.sp-nav ul {
    margin-bottom: 40px;
}

.sp-nav li {
    margin-bottom: 24px;
}

.sp-nav a {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.sp-nav-footer {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: auto;
    padding-top: 20px;
}

.sp-nav-tel {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent-color);
    text-align: center;
}

.sp-nav-btn {
    background-color: var(--accent-color);
    color: #000;
    padding: 12px;
    text-align: center;
    border-radius: 4px;
    font-weight: 700;
    font-size: 1rem;
}

.sp-nav a.sp-nav-admin-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.sp-nav a.sp-nav-admin-link:hover {
    color: var(--accent-color);
}

/* --------------------------------------------------------------------------
   4. TOPファーストビュー演出 (FV)
   -------------------------------------------------------------------------- */
.fv-section {
    position: relative;
    width: 100%;
    height: 100vh;
    background-color: #000;
    overflow: hidden;
    z-index: 10;
}

.panels-container {
    display: flex;
    width: 100%;
    height: 100%;
}

.panel-card {
    flex: 1;
    height: 100%;
    perspective: 1500px;
    cursor: pointer;
    border-right: 1px solid rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

.panel-card:last-child {
    border-right: none;
}

.panel-card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 1.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.panel-card.flipped .panel-card-inner {
    transform: rotateY(-180deg) scale(0.98);
}

.panel-front,
.panel-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.panel-front {
    background-size: 100% 100%;
    background-repeat: no-repeat;
    transition: transform 0.5s ease;
}

/* 各パネルの背景画像指定（PC表示用） */
.panel-card[data-index="1"] .panel-front { background-image: url('./assets/images/Adobe Express - file1.png'); }
.panel-card[data-index="2"] .panel-front { background-image: url('./assets/images/Adobe Express - file2.png'); }
.panel-card[data-index="3"] .panel-front { background-image: url('./assets/images/Adobe Express - file3.png'); }
.panel-card[data-index="4"] .panel-front { background-image: url('./assets/images/Adobe Express - file4.png'); }
.panel-card[data-index="5"] .panel-front { background-image: url('./assets/images/Adobe Express - file5.png'); }
.panel-card[data-index="6"] .panel-front { background-image: url('./assets/images/Adobe Express - file6.png'); }
.panel-card[data-index="7"] .panel-front { background-image: url('./assets/images/Adobe Express - file7.png'); }
.panel-card[data-index="8"] .panel-front { background-image: url('./assets/images/Adobe Express - file8.png'); }

.panel-card:not(.flipped):hover .panel-front {
    transform: scale(1.05);
}

.panel-back {
    background-color: #000000;
    transform: rotateY(-180deg);
}

.fv-instruction {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-secondary);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    pointer-events: none;
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    animation: pulse 2s infinite;
}

.instruction-arrow {
    width: 12px;
    height: 12px;
    border-bottom: 2px solid var(--text-secondary);
    border-right: 2px solid var(--text-secondary);
    transform: rotate(45deg);
}

/* スマホ用背景動画 */
.sp-video-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    display: none; /* デフォルト非表示、スマホのみ表示 */
    overflow: hidden;
}

.sp-video-bg {
    width: 100%;
    height: 100%;
    object-fit: cover; /* アスペクト比を維持して全面を覆う */
}

.fv-message-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 30;
    opacity: 0;
    pointer-events: none;
    transition: opacity 1.5s ease;
    padding: 0 4%;
}

.fv-message-overlay::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 85%;
    max-width: 550px;
    height: 85%;
    max-height: 550px;
    background-image: url('./assets/images/hoshirogo.png');
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    filter: invert(1); /* 黒ロゴを白ロゴに反転 */
    mix-blend-mode: screen; /* 黒背景を透過ブレンド */
    opacity: 0.15; /* 薄いグレー（低透過率）に調整 */
    z-index: 1;
    pointer-events: none;
}

.fv-message-overlay.is-active {
    opacity: 1;
    pointer-events: auto;
}

.fv-message-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin-top: 0;
    transform: translateY(30px);
    transition: transform 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.fv-message-overlay.is-active .fv-message-content {
    transform: translateY(0);
}

.msg-sub {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.msg-main {
    font-family: var(--font-serif);
    font-size: 2.8rem;
    font-weight: 900;
    letter-spacing: 0.15em;
    margin-bottom: 30px;
}

.msg-company {
    font-family: var(--font-serif);
    font-size: 3.2rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    margin-bottom: 0;
}

.msg-company .highlight {
    color: var(--accent-color);
}

.fv-message-actions {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 70px;
    display: flex;
    justify-content: center;
    gap: 20px;
    width: 100%;
    z-index: 10;
}

.fv-message-actions .btn {
    padding: 10px 20px;
    font-size: 0.85rem;
}

.scroll-indicator {
    position: absolute;
    bottom: -40px; /* SCROLL DOWN全体を40px引き上げる調整 */
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    z-index: 2;
}

.scroll-indicator span {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--text-muted);
}

.scroll-bar {
    width: 1px;
    height: 60px;
    background-color: var(--text-muted);
    position: relative;
    overflow: hidden;
}

.scroll-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 20px;
    background-color: var(--accent-color);
    animation: scroll-line 2s infinite cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   5. 重要なお知らせバナー (ANNOUNCEMENT BANNER)
   -------------------------------------------------------------------------- */
.announcement-banner {
    position: relative;
    top: 0;
    left: 0;
    width: 100%;
    max-width: 800px;
    margin: 30px auto 80px !important;
    background-color: #aa1a1a;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    z-index: 10;
    padding: 18px 28px;
    animation: none;
    box-sizing: border-box;
}

.announcement-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
}

.announce-badge {
    background-color: #000;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 900;
    padding: 4px 8px;
    border-radius: 2px;
    flex-shrink: 0;
}

.announce-content {
    flex-grow: 1;
    font-size: 0.9rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.6;
}

.announce-content a {
    text-decoration: underline;
    color: var(--accent-color);
}

.announce-close {
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    line-height: 1;
    opacity: 0.7;
    transition: var(--transition-smooth);
}

.announce-close:hover {
    opacity: 1;
}

@keyframes slide-down {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   6. 導入・キャッチコピー・巨大コンタクトボタン (INTRO)
   -------------------------------------------------------------------------- */
.intro-section {
    padding: 160px 0;
}

.intro-tag {
    color: var(--accent-color);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.2em;
    margin-bottom: 35px;
    text-transform: uppercase;
}

.intro-catch {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 900;
    line-height: 1.7;
    margin-bottom: 50px;
    letter-spacing: 0.05em;
}

.intro-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 900px;
    margin: 0 auto 70px;
    line-height: 1.8;
}

/* 巨大コンタクトボタン (LINE削除に伴い2分割に調整) */
.intro-contact-box {
    display: flex;
    justify-content: center;
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.intro-contact-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px 30px;
    border-radius: 6px;
    transition: var(--transition-smooth);
    border: 1px solid var(--border-color);
}

.intro-contact-btn .btn-sub {
    font-size: 0.8rem;
    margin-bottom: 6px;
}

.intro-contact-btn .btn-main {
    font-size: 1.4rem;
    font-weight: 900;
}

.intro-contact-btn.tel {
    background-color: var(--bg-secondary);
    color: var(--accent-color);
    border-color: rgba(197, 168, 128, 0.3);
}

.intro-contact-btn.tel:hover {
    border-color: var(--accent-color);
    background-color: rgba(197, 168, 128, 0.05);
    transform: translateY(-3px);
}

.intro-contact-btn.form {
    background-color: var(--accent-color);
    color: #000;
    border-color: var(--accent-hover);
}

.intro-contact-btn.form:hover {
    background-color: var(--accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(197, 168, 128, 0.3);
}

/* --------------------------------------------------------------------------
   7. 事業内容の簡易紹介 (SERVICES PREVIEW)
   -------------------------------------------------------------------------- */
.services-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-preview-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 40px 30px;
    border-radius: 4px;
    transition: var(--transition-smooth);
}

.service-preview-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-3px);
}

.service-preview-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--accent-color);
    color: var(--text-primary);
}

.service-preview-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   8. 工事実績の表示 (WORKS PREVIEW & ARCHIVE)
   -------------------------------------------------------------------------- */
.works-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.work-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.work-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
}

.work-card-img {
    height: 220px;
    overflow: hidden;
    position: relative;
}

.work-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.work-card:hover .work-card-img img {
    transform: scale(1.05);
}

.work-badge {
    position: absolute;
    bottom: 12px;
    left: 12px;
    background-color: rgba(0, 0, 0, 0.7);
    color: var(--text-primary);
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 700;
    border: 1px solid var(--accent-color);
    border-radius: 2px;
    z-index: 4;
}

/* カルーセルスタック全体のコンテナ */
.work-card-img.image-stack {
    height: 220px;
    position: relative;
    overflow: visible;
    cursor: pointer;
    background: #000;
    perspective: 1000px;
}

/* スタック内の各画像ラッパー */
.work-card-img.image-stack .stack-img-wrap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 4px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), 
                z-index 0.4s step-end, 
                opacity 0.4s ease,
                box-shadow 0.4s ease;
    transform-origin: bottom center;
}

/* ラッパーの中の画像 */
.work-card-img .stack-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
}

/* 1枚目（最前面） */
.work-card-img.image-stack .stack-img-1 {
    z-index: 3;
    transform: translate3d(0, 0, 0);
    opacity: 1;
}

/* 2枚目 */
.work-card-img.image-stack .stack-img-2 {
    z-index: 2;
    transform: translate3d(4px, -6px, -10px) scale(0.96);
    opacity: 0.85;
}

/* 3枚目 */
.work-card-img.image-stack .stack-img-3 {
    z-index: 1;
    transform: translate3d(8px, -12px, -20px) scale(0.92);
    opacity: 0.7;
}

/* ホバー時の扇状の広がり効果 */
.work-card-img.image-stack:hover .stack-img-1 {
    transform: translate3d(-10px, -5px, 0) rotate(-2deg);
    box-shadow: 0 10px 20px rgba(0,0,0,0.4);
}
.work-card-img.image-stack:hover .stack-img-2 {
    transform: translate3d(0, -10px, -10px) scale(0.98);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    opacity: 0.95;
}
.work-card-img.image-stack:hover .stack-img-3 {
    transform: translate3d(10px, -15px, -20px) rotate(2deg) scale(0.96);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
    opacity: 0.85;
}

/* スライド切り替え時のアニメーション用クラス */
.work-card-img.image-stack .stack-img-wrap.transition-out {
    animation: stackSlideOut 0.4s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
}

@keyframes stackSlideOut {
    0% {
        transform: translate3d(0, 0, 0) rotate(0);
        z-index: 4;
    }
    50% {
        transform: translate3d(-110%, -10px, 50px) rotate(-10deg) scale(1.05);
        z-index: 4;
    }
    51% {
        z-index: 1;
    }
    100% {
        transform: translate3d(8px, -12px, -20px) scale(0.92);
        z-index: 1;
        opacity: 0.7;
    }
}

/* 単一画像の右上バッジおよびスタック内画像の右上バッジ */
.img-badge-top-right {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: #aa1a1a;
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 2px;
    z-index: 5;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

.work-card-img {
    position: relative;
}

.work-card-img .img-badge-top-right {
    z-index: 5;
}

/* 枚数インジケーター (ラベルと衝突しないように左上に移動) */
.stack-counter {
    position: absolute;
    top: 12px;
    left: 12px;
    background-color: rgba(0, 0, 0, 0.6);
    color: #fff;
    padding: 3px 6px;
    font-size: 0.7rem;
    border-radius: 3px;
    pointer-events: none;
    z-index: 5;
    font-weight: 500;
}

.stack-hint {
    position: absolute;
    bottom: 12px;
    right: 12px;
    background-color: #c5a880;
    color: #000;
    padding: 3px 8px;
    font-size: 0.65rem;
    border-radius: 3px;
    pointer-events: none;
    z-index: 5;
    font-weight: 700;
    opacity: 0;
    transform: translateY(5px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.work-card-img.image-stack:hover .stack-hint {
    opacity: 1;
    transform: translateY(0);
}

.work-card-info {
    padding: 24px;
}

.work-card-meta {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.work-card-category {
    font-size: 0.75rem;
    color: var(--accent-color);
    font-weight: 700;
}

.work-card-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.work-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.4;
}

.work-card-loc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   9. 選ばれる理由の簡易表示 (FEATURES PREVIEW)
   -------------------------------------------------------------------------- */
.features-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-preview-item {
    display: flex;
    flex-direction: column;
    position: relative;
    padding-left: 20px;
}

.feature-preview-item .num {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--accent-color);
    line-height: 1.1;
    margin-bottom: 10px;
}

.feature-preview-item h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-preview-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   10. Instagram表示エリア (INSTAGRAM SECTION)
   -------------------------------------------------------------------------- */
.instagram-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.instagram-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    padding: 15px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 480px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.instagram-embed-wrapper {
    width: 100%;
    height: 380px;
    overflow: hidden;
    border-radius: 2px;
}

.instagram-embed-wrapper iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.instagram-fallback {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 380px;
    padding: 24px;
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--border-color);
    border-radius: 2px;
    text-align: center;
}

.instagram-fallback .fallback-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
    opacity: 0.6;
}

.instagram-fallback h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--accent-color);
}

.instagram-fallback p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.instagram-card-footer {
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.instagram-card-title {
    font-size: 0.9rem;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 70%;
}

.instagram-btn-sm {
    font-size: 0.75rem;
    padding: 6px 12px;
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    border-radius: 2px;
}

.instagram-btn-sm:hover {
    background-color: var(--accent-color);
    color: #000;
}

/* --------------------------------------------------------------------------
   11. 工事の流れの簡易表示 (FLOW PREVIEW)
   -------------------------------------------------------------------------- */
.flow-preview-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.flow-preview-step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 24px 15px;
    border-radius: 4px;
    text-align: center;
}

.flow-preview-step .step-icon {
    width: 36px;
    height: 36px;
    background-color: var(--accent-color);
    color: #000;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    margin-bottom: 12px;
}

.flow-preview-step h5 {
    font-size: 1rem;
    font-weight: 700;
}

.flow-preview-step-arrow {
    color: var(--accent-color);
    font-size: 1.5rem;
    font-weight: 900;
}

/* --------------------------------------------------------------------------
   12. よくある質問アコーディオン (FAQ)
   -------------------------------------------------------------------------- */
.faq-accordion-preview {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.faq-preview-item-simple {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: 4px;
}

.faq-preview-item-simple h5 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 8px;
}

.faq-preview-item-simple p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px 24px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.faq-icon {
    width: 16px;
    height: 16px;
    position: relative;
    flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background-color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.faq-icon::before {
    top: 7px;
    left: 0;
    width: 16px;
    height: 2px;
}

.faq-icon::after {
    top: 0;
    left: 7px;
    width: 2px;
    height: 16px;
}

.faq-question[aria-expanded="true"] .faq-icon::after {
    transform: rotate(90deg);
    opacity: 0;
}

.faq-question[aria-expanded="true"] .faq-icon::before {
    background-color: var(--accent-color);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-answer p {
    padding: 0 24px 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    padding-top: 16px;
}

/* --------------------------------------------------------------------------
   13. 会社概要への導線 (ABOUT PREVIEW)
   -------------------------------------------------------------------------- */
.about-preview-box {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.about-preview-content {
    padding: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.about-preview-content .lead-text {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.5;
}

.about-preview-table {
    width: 100%;
    border-collapse: collapse;
}

.about-preview-table th,
.about-preview-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
    font-size: 0.95rem;
}

.about-preview-table th {
    width: 130px;
    color: var(--accent-color);
    font-weight: 700;
}

.about-preview-table tr:last-child th,
.about-preview-table tr:last-child td {
    border-bottom: none;
}

.about-preview-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
    align-items: start;
}

.about-table {
    width: 100%;
    border-collapse: collapse;
}

.about-table th,
.about-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.about-table th {
    width: 250px;
    text-align: left;
    font-weight: 700;
    color: var(--accent-color);
    vertical-align: top;
    font-size: 0.95rem;
}

.about-table td {
    color: var(--text-primary);
    font-size: 0.95rem;
}

.about-table tr:last-child th,
.about-table tr:last-child td {
    border-bottom: none;
}

.about-map {
    border: 1px solid var(--border-color);
    padding: 10px;
    background-color: var(--bg-secondary);
    border-radius: 4px;
}

.map-container {
    position: relative;
    width: 100%;
    height: 450px;
    overflow: hidden;
    border-radius: 2px;
}

.map-container iframe {
    filter: invert(90%) hue-rotate(180deg) grayscale(10%) contrast(90%);
}

/* --------------------------------------------------------------------------
   14. 最終お問い合わせ (CONTACT GATE - LINE削除に伴い2分割へ)
   -------------------------------------------------------------------------- */
.final-contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.final-contact-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 40px 20px;
    border-radius: 6px;
    transition: var(--transition-smooth);
}

.final-contact-card:hover {
    transform: translateY(-5px);
}

.final-contact-card .icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
    display: block;
}

.final-contact-card h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.final-contact-card .num {
    font-size: 1.8rem;
    font-weight: 900;
    margin-bottom: 10px;
}

.final-contact-card .num-text {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.final-contact-card .sub {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.final-contact-card.tel {
    color: var(--accent-color);
    border-color: rgba(197, 168, 128, 0.3);
}

.final-contact-card.tel:hover {
    background-color: rgba(197, 168, 128, 0.05);
    border-color: var(--accent-color);
}

.final-contact-card.form {
    background-color: var(--accent-color);
    color: #000;
    border-color: var(--accent-hover);
}

.final-contact-card.form:hover {
    background-color: var(--accent-hover);
}

/* お問い合わせページの巨大グリッドも2分割に変更 */
.contact-huge-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 50px;
}

.contact-huge-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
    text-align: center;
    cursor: pointer;
}

.contact-huge-btn .icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.contact-huge-btn .title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.contact-huge-btn .desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.contact-huge-btn.tel {
    background-color: rgba(255, 255, 255, 0.02);
    color: var(--accent-color);
    border-color: rgba(197, 168, 128, 0.3);
}

.contact-huge-btn.tel:hover {
    border-color: var(--accent-color);
    background-color: rgba(197, 168, 128, 0.05);
    transform: translateY(-3px);
}

.contact-huge-btn.form {
    background-color: var(--accent-color);
    color: #000;
    border-color: var(--accent-hover);
}

.contact-huge-btn.form:hover {
    background-color: var(--accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(197, 168, 128, 0.2);
}

/* consent Gate */
.form-consent-box {
    margin-bottom: 24px;
    background-color: rgba(255, 255, 255, 0.02);
    padding: 16px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox-label a {
    color: var(--accent-color);
    text-decoration: underline;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-color);
    cursor: pointer;
}

.btn-primary:disabled {
    background-color: var(--bg-tertiary);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    cursor: not-allowed;
    box-shadow: none !important;
    transform: none !important;
}

/* --------------------------------------------------------------------------
   15. フッター
   -------------------------------------------------------------------------- */
.site-footer {
    background-color: #050505;
    padding: 60px 0 20px;
    border-top: 1px solid var(--border-color);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
}
.footer-info {
    position: relative;
    z-index: 1;
    text-align: center;
}

.footer-info::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 275px;
    height: 275px;
    background-image: url('./assets/images/hoshirogo.png');
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    filter: invert(1);
    mix-blend-mode: screen;
    opacity: 0.12;
    z-index: -1;
    pointer-events: none;
}

.footer-info h3 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 900;
    margin-bottom: 16px;
}

.footer-address,
.footer-tel {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.footer-sns {
    margin-top: 15px;
}

.footer-sns a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.footer-sns a:hover {
    color: var(--accent-color);
}

.footer-sns .sns-icon {
    font-size: 1.1rem;
}

.footer-nav {
    margin-top: -10px;
}

.footer-nav ul {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 30px;
}

.footer-nav a {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-nav a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 20px;
}

.footer-bottom-inner {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.copyright {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   16. スマホ用固定コンタクトバー (LINE削除に伴い2分割化)
   -------------------------------------------------------------------------- */
.sp-fixed-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    display: flex;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    z-index: 90;
    box-shadow: 0 -5px 15px rgba(0,0,0,0.5);
}

.sp-bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
    font-weight: 700;
}

.sp-bar-tel {
    background-color: var(--bg-tertiary);
    color: var(--accent-color);
    border-right: 1px solid var(--border-color);
}

.sp-bar-insta {
    background-color: var(--bg-tertiary);
    color: #fff;
    border-right: 1px solid var(--border-color);
}

.sp-bar-mail {
    background-color: var(--accent-color);
    color: #000;
}

.bar-icon {
    font-size: 1.2rem;
}

/* --------------------------------------------------------------------------
   17. アニメーションキーフレーム
   -------------------------------------------------------------------------- */
@keyframes pulse {
    0%, 100% { opacity: 0.7; transform: translate(-50%, 0); }
    50% { opacity: 0.3; transform: translate(-50%, 5px); }
}

@keyframes scroll-line {
    0% { top: -20px; }
    100% { top: 60px; }
}

/* --------------------------------------------------------------------------
   18. レレスポンシブ対応 (メディアクエリ)
   -------------------------------------------------------------------------- */

@media screen and (max-width: 1199px) {
    .container {
        padding: 0 5%;
    }
    
    .intro-contact-box {
        gap: 20px;
    }
    
    .about-grid,
    .about-preview-box {
        grid-template-columns: 1fr;
    }
    
    .map-container {
        height: 350px;
    }
}

@media screen and (min-width: 768px) and (max-width: 1199px) {
    .services-preview-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .works-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .features-preview-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .instagram-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .flow-preview-steps {
        max-width: 700px;
    }
    
    .final-contact-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media screen and (max-width: 1199px) and (min-width: 768px) {
    .header-logo-mark {
        height: 48px;
    }
    .header-nav li {
        margin-left: 15px;
    }
    .header-nav a {
        font-size: 0.85rem;
    }
    .header-nav .nav-admin-btn {
        padding: 4px 8px;
        font-size: 0.75rem;
    }
}

@media screen and (max-width: 767px) {
    /* 表示制御ユーティリティ切り替え */
    .pc-only {
        display: none !important;
    }
    .sp-only {
        display: block !important;
    }

    html {
        font-size: 15px;
    }
    
    .section {
        padding: 80px 0;
    }
    
    .section-title {
        font-size: 2rem;
        margin-bottom: 35px;
    }
    
    .section-lead {
        font-size: 1rem;
        margin-bottom: 40px;
    }
    
    .site-header {
        height: 70px;
    }
    :root {
        --header-height: 70px;
    }
    .header-logo-mark {
        height: 45px;
    }
    

    
    .sp-video-container {
        display: block; /* スマホのみ表示 */
    }

    .fv-message-overlay {
        background-color: rgba(0, 0, 0, 0.95) !important; /* 動画終了後は、添付画像のようにしっかりとした黒背景にします */
    }
    
    .fv-instruction {
        bottom: 80px;
        width: 90%;
        text-align: center;
    }
    
    .fv-message-content {
        margin-top: 0;
    }
    
    .fv-message-overlay.is-active .fv-message-content {
        transform: translateY(-90px); /* スマホ表示時はメッセージ全体を90px上にあげる（上下中央に調整） */
    }

    .fv-message-overlay::before {
        transform: translate(-50%, calc(-50% - 90px)) !important; /* スマホ表示時は中央背景の星ロゴも90px上にあげる */
    }
    
    .scroll-indicator {
        bottom: 70px; /* スマホ固定フッターバー(60px)との重なりを防ぐため上に調整 */
    }
    .scroll-indicator .scroll-bar {
        height: 20px !important; /* 縦線を短縮して重なりを回避 */
    }
    
    .msg-sub {
        font-size: 1.2rem;
        margin-bottom: 12px;
    }
    
    .msg-main {
        font-size: 1.8rem;
        margin-bottom: 20px;
        line-height: 1.4;
    }
    
    .msg-company {
        font-size: 2.1rem;
        margin-bottom: 0;
    }
    
    .fv-message-actions {
        position: absolute !important;
        top: 100% !important;
        left: 50% !important;
        transform: translateX(-50%) !important;
        margin-top: 70px !important;
        display: flex !important;
        flex-direction: row !important;
        justify-content: center;
        gap: 10px;
        width: 100%;
        max-width: 90%;
        margin: 0 auto;
        z-index: 10;
    }
    
    .fv-message-actions .btn {
        width: auto !important;
        flex: 1;
        padding: 8px 10px !important;
        font-size: 0.75rem !important;
        white-space: nowrap;
    }
    
    .intro-catch {
        font-size: 1.6rem;
    }
    
    .intro-desc {
        font-size: 1rem;
    }
    
    .intro-contact-box {
        flex-direction: column;
        gap: 15px;
        width: 100%;
    }
    
    .intro-contact-btn .btn-main {
        font-size: 1.15rem;
    }
    
    .services-preview-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .works-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .features-preview-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .instagram-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .instagram-card {
        height: auto;
    }
    
    .flow-preview-steps {
        flex-direction: column;
        gap: 15px;
    }
    
    .flow-preview-step-arrow {
        transform: rotate(90deg);
        margin: 5px 0;
    }
    
    .flow-preview-step {
        width: 100%;
    }
    
    .about-preview-content {
        padding: 30px 20px;
    }
    
    .about-preview-table th {
        width: 100px;
    }
    
    .about-table th {
        width: 110px;
        padding: 12px 10px;
        font-size: 0.85rem;
    }
    
    .about-table td {
        padding: 12px 10px;
        font-size: 0.85rem;
    }
    
    .final-contact-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .final-contact-card {
        padding: 30px 15px;
    }
    
    .final-contact-card .num {
        font-size: 1.6rem;
    }
    
    /* 巨大お問い合わせボタンもスマホで100%幅に */
    .contact-huge-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .footer-container {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 30px;
    }
    
    .footer-info {
        width: 100%;
        text-align: center;
    }
    
    .footer-nav {
        width: 100%;
        max-width: 290px; /* 2列表示が広がりすぎないように調整 */
        margin: 0 auto;
        margin-top: 20px;
    }
    
    .footer-nav ul {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px 20px;
        text-align: center;
    }
    
    body {
        padding-bottom: 60px;
    }
}

/* ==========================================================================
   過去年度の実績アコーディオン (WORKS ACCORDION)
   ========================================================================== */
.past-works-section {
    margin-top: 100px;
    border-top: 1px solid var(--border-color);
    padding-top: 80px;
}

.past-works-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: 40px;
    text-align: center;
    color: var(--text-primary);
    position: relative;
    letter-spacing: 0.05em;
}

.past-works-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background-color: var(--accent-color);
    margin: 15px auto 0;
}

.archive-accordion-wrapper {
    max-width: 1000px;
    margin: 0 auto;
}

.archive-accordion-item {
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    margin-bottom: 20px;
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.archive-accordion-item:hover {
    border-color: rgba(197, 168, 128, 0.4);
}

.archive-accordion-trigger {
    width: 100%;
    padding: 24px 30px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-smooth);
    font-family: var(--font-sans);
}

.archive-accordion-trigger:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.archive-accordion-trigger .year-label {
    flex-grow: 1;
    letter-spacing: 0.05em;
}

.archive-accordion-trigger .count-badge {
    background-color: var(--accent-color);
    color: #000;
    padding: 3px 10px;
    font-size: 0.8rem;
    border-radius: 20px;
    margin-right: 20px;
    font-weight: 700;
    line-height: 1;
}

.archive-accordion-trigger .arrow-icon {
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.archive-accordion-trigger[aria-expanded="true"] {
    background-color: rgba(197, 168, 128, 0.05);
    color: var(--accent-color);
}

.archive-accordion-trigger[aria-expanded="true"] .arrow-icon {
    transform: rotate(180deg);
    color: var(--accent-color);
}

.archive-accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background-color: rgba(0, 0, 0, 0.15);
}

.archive-accordion-content-inner {
    padding: 40px 30px;
    border-top: 1px solid var(--border-color);
}

@media screen and (max-width: 767px) {
    .past-works-section {
        margin-top: 60px;
        padding-top: 50px;
    }
    
    .past-works-title {
        font-size: 1.6rem;
    }
    
    .archive-accordion-trigger {
        padding: 18px 20px;
        font-size: 1.05rem;
    }
    
    .archive-accordion-trigger .count-badge {
        margin-right: 10px;
        padding: 2px 8px;
    }
    
    .archive-accordion-content-inner {
        padding: 24px 15px;
    }
}

/* ==========================================================================
   19. 会社情報スライダー用の追加スタイル (ABOUT SLIDER)
   ========================================================================== */
.about-preview-visual {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 3 / 2; /* アスペクト比を横長（3:2）に固定 */
    width: 100%;
    align-self: center; /* 縦に引き伸ばされず、中央に配置 */
    border-radius: 4px; /* 角丸を適用 */
}
.about-preview-visual .slider-inner {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
}
.about-preview-visual .slider-inner img {
    flex-shrink: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.about-preview-visual .slider-dots {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}
.about-preview-visual .slider-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.4);
    transition: background-color 0.3s, transform 0.3s;
}
.about-preview-visual .slider-dot.active {
    background-color: #fff;
    transform: scale(1.2);
}
.about-preview-visual .slider-hint {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: rgba(0, 0, 0, 0.6);
    color: #fff;
    padding: 5px 10px;
    font-size: 0.75rem;
    border-radius: 4px;
    pointer-events: none;
    opacity: 0.8;
    transition: opacity 0.3s;
    z-index: 10;
}
.about-preview-visual:hover .slider-hint {
    opacity: 1;
}

/* --------------------------------------------------------------------------
   協力会社セクション (PARTNERS) & 個別ページ
   -------------------------------------------------------------------------- */
.partners-section {
    background-color: var(--bg-secondary);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 960px;
    margin: 0 auto;
}

.partner-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 40px 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-align: left;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    text-decoration: none;
}

.partner-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--accent-color);
    opacity: 0.3;
    transition: var(--transition-smooth);
}

.partner-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.partner-card:hover::before {
    opacity: 1;
}

.partner-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: 0.15em;
    margin-bottom: 12px;
}

.partner-name {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 15px;
    letter-spacing: 0.05em;
}

.partner-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 30px;
}

.partner-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-top: auto;
    transition: var(--transition-smooth);
}

.partner-card:hover .partner-link {
    color: var(--accent-hover);
    transform: translateX(4px);
}

.partner-link .arrow {
    transition: var(--transition-smooth);
}

/* 協力会社個別ページ用スタイル */
.partner-profile-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 50px 40px;
    max-width: 900px;
    margin: 0 auto 50px;
    position: relative;
    overflow: hidden;
}

.partner-profile-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--accent-color);
}

.partner-profile-header {
    margin-bottom: 35px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}

.partner-profile-header .partner-badge {
    margin-bottom: 10px;
}

.partner-profile-title {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

.partner-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 35px;
}

.partner-table th,
.partner-table td {
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.95rem;
    text-align: left;
}

.partner-table th {
    width: 25%;
    color: var(--text-secondary);
    font-weight: 700;
    background-color: rgba(255, 255, 255, 0.02);
}

.partner-table td {
    width: 75%;
    color: var(--text-primary);
    line-height: 1.7;
}

.partner-status-notice {
    background-color: var(--bg-tertiary);
    border-left: 3px solid var(--accent-color);
    padding: 20px 25px;
    border-radius: 0 4px 4px 0;
    margin-top: 20px;
}

.partner-status-notice p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.partner-nav-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
    flex-wrap: wrap;
}

@media screen and (max-width: 767px) {
    .partners-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .partner-card {
        padding: 30px 20px;
    }
    .partner-name {
        font-size: 1.4rem;
    }
    .partner-profile-card {
        padding: 30px 20px;
    }
    .partner-profile-title {
        font-size: 1.6rem;
    }
    .partner-table th,
    .partner-table td {
        display: block;
        width: 100%;
        padding: 12px 10px;
    }
    .partner-table th {
        background-color: transparent;
        color: var(--accent-color);
        padding-bottom: 4px;
        border-bottom: none;
    }
    .partner-table td {
        padding-top: 0;
        margin-bottom: 10px;
    }
    .partner-nav-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .partner-nav-actions .btn {
        width: 100%;
    }
}