:root {
            --primary-dark: #0A192F;     /* サイト共通の深いネイビー */
            --primary-blue: #005bac;     /* アクセントの鮮やかなブルー */
            --primary-light: #e6f0fa;    /* 薄いアクティブ背景 */
            --text-color: #333333;       /* メインテキスト色 */
            --text-muted: #777777;       /* 補足テキスト色 */
            --border-color: #dddddd;     /* 枠線色 */
            --bg-color: #fcfcfd;         /* ページ全体背景 */
            --required-color: #e03131;   /* 必須マークの赤 */
            --footer-bg: #0A192F;        /* フッターの濃紺背景 */
        }

        body {
            font-family: 'Noto Serif JP', serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            margin: 0;
            padding: 0;
            line-height: 1.6;
        }

        /* ーーー 1. 共通ヘッダー ーーー */
        .site-header {
            background-color: #ffffff;
            border-bottom: 1px solid var(--border-color);
            padding: 0 24px;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 10px rgba(0,0,0,0.03);
        }

        .header-container {
            max-width: 1200px;
            height: 80px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .header-logo-group {
            display: flex;
            align-items: center;
            text-decoration: none;
        }

        .header-logo-img {
            height: 42px;
            width: auto;
            display: block;
        }

        .header-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .header-nav a {
            color: var(--primary-dark);
            text-decoration: none;
            font-size: 15px;
            font-weight: 600;
            transition: color 0.2s;
            position: relative;
            padding: 8px 0;
        }

        .header-nav a::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-blue);
            transition: width 0.2s;
        }

        .header-nav a:hover {
            color: var(--primary-blue);
        }

        .header-nav a:hover::after {
            width: 100%;
        }

        /* ーーー 2. アイキャッチエリア（ご指定URLのデザインを完全に再現） ーーー */
        .eyecatch-area {
            /* 実際のサイトの深く知的なダークネイビー */
            background-color: #0b1c33; 
            color: #ffffff;
            text-align: center;
            padding: 50px 20px;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        /* 背景に横たわる、公式の力強い「オレンジの曲線」レイヤー */
        .eyecatch-area::before {
            content: "";
            position: absolute;
            bottom: -60px;
            right: -10%;
            width: 600px;
            height: 200px;
            /* 鮮やかなオレンジからダークオレンジへ抜ける美しい曲線（グラデーションを効かせた楕円） */
            background: radial-gradient(ellipse at center, #ff6b00 0%, #e65c00 70%, transparent 100%);
            border-radius: 50%;
            transform: rotate(-15deg); /* 斜めに走る躍動感のあるカーブ */
            opacity: 0.85;
            pointer-events: none;
            z-index: 1;
        }

        /* 左上から差し込む、公式サイトの「ブルーの光の曲線」レイヤー */
        .eyecatch-area::after {
            content: "";
            position: absolute;
            top: -100px;
            left: -5%;
            width: 500px;
            height: 250px;
            background: radial-gradient(ellipse at center, rgba(0, 114, 210, 0.4) 0%, transparent 80%);
            border-radius: 50%;
            transform: rotate(20deg);
            pointer-events: none;
            z-index: 2;
        }

        .eyecatch-inner {
            position: relative;
            z-index: 5; /* 曲線より前に文字を配置 */
            max-width: 800px;
            margin: 0 auto;
        }

        .eyecatch-title {
            font-size: 32px;
            font-weight: 700;
            margin: 0 0 10px 0;
            letter-spacing: 3px;
            color: #ffffff;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
        }

        .eyecatch-subtitle {
            font-size: 14px;
            color: #a5b4fc; /* ネイビーに美しく映えるペールブルー */
            margin: 0;
            font-weight: 500;
            letter-spacing: 0.5px;
        }

        /* ーーー 3. メインフォームコンテナ ーーー */
        .form-container {
            max-width: 760px;
            margin: 40px auto;
            background: #ffffff;
            padding: 50px 40px;
            border-radius: 8px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
            border: 1px solid #eeeeee;
        }

        /* プログレスバー（進捗状況） */
        .steps-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 50px;
            position: relative;
        }

        .steps-container::before {
            content: "";
            position: absolute;
            top: 18px;
            left: 0;
            right: 0;
            height: 2px;
            background-color: #e5e5e5;
            z-index: 1;
        }

        .step {
            position: relative;
            z-index: 2;
            text-align: center;
            flex: 1;
        }

        .step-number {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background-color: #e5e5e5;
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 10px;
            font-weight: bold;
            font-size: 14px;
            transition: all 0.3s ease;
        }

        .step-label {
            font-size: 13px;
            color: #999999;
            font-weight: 600;
        }

        .step.active .step-number {
            background-color: var(--primary-blue);
            box-shadow: 0 0 0 5px rgba(0, 91, 172, 0.15);
        }

        .step.active .step-label {
            color: var(--primary-blue);
        }

        /* フォームレイアウト */
        .form-group {
            display: flex;
            flex-direction: column;
            margin-bottom: 28px;
        }

        .corporate-field {
            display: flex;
            flex-direction: column;
            margin-bottom: 28px;
            opacity: 0;
            visibility: hidden;
            height: 0;
            overflow: hidden;
            transition: opacity 0.3s ease, transform 0.3s ease, margin 0.3s ease;
            transform: translateY(-10px);
        }

        .corporate-field.show {
            opacity: 1;
            visibility: visible;
            height: auto;
            overflow: visible;
            transform: translateY(0);
            margin-bottom: 28px;
        }

        .form-label-container {
            display: flex;
            align-items: center;
            margin-bottom: 8px;
        }

        .form-label {
            font-weight: 700;
            font-size: 15px;
            color: var(--primary-dark);
        }

        .badge {
            font-size: 11px;
            padding: 3px 8px;
            border-radius: 3px;
            margin-left: 10px;
            font-weight: bold;
        }

        .badge.required {
            background-color: var(--required-color);
            color: white;
        }

        .badge.optional {
            background-color: #f1f3f5;
            color: #666666;
        }

        .form-note {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 5px;
        }

        input[type="text"],
        input[type="email"],
        select {
            width: 100%;
            padding: 14px;
            font-size: 16px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            box-sizing: border-box;
            transition: border-color 0.2s, box-shadow 0.2s;
            background-color: #fff;
            color: var(--text-color);
        }

        input:focus, select:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 4px rgba(0, 91, 172, 0.1);
        }

        /* プロモーション入力 */
        .promo-input-wrap {
            display: flex;
            gap: 10px;
        }
        .promo-input-wrap input[type="text"] {
            flex: 1;
        }

        .btn-secondary {
            background-color: #5c6b73;
            color: #ffffff;
            border: none;
            padding: 0 24px;
            font-size: 14px;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            white-space: nowrap;
            transition: background-color 0.2s;
        }
        .btn-secondary:hover {
            background-color: var(--primary-dark);
        }

        .btn-secondary2 {
            background-color: #ffffff;
            color: #ffffff;
            border: none;
            padding: 0 24px;
            font-size: 14px;
            font-weight: 600;
            border-radius: 6px;
            white-space: nowrap;
        }

        .btn-secondary3 {
            padding: 0 24px;
            font-size: 14px;
        }

        /* 金額表示 */
        .price-box {
            background-color: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 6px;
            padding: 18px;
            margin-bottom: 1px;
        }
        .price {
            display: flex;
            justify-content: space-between;
            font-size: 18px;
            margin-bottom: 15px;
            font-weight: bold;
        }
        .price-row {
            display: flex;
            justify-content: space-between;
            font-size: 14px;
            margin-top: 10px;
            margin-bottom: 10px;
        }
        .price-row.total {
            margin-bottom: 0;
            font-weight: bold;
            font-size: 20px;
        }
        .price-value {
            color: #000000;
        }
        .price-value-discount { color: var(--required-color); }
        .price-value-total { color: var(--primary-blue); }

        .promo-message {
            font-size: 13px;
            margin-top: 6px;
            font-weight: 600;
        }
        .promo-message.success { color: #2b8a3e; }
        .promo-message.error { color: var(--required-color); }

        /* 確認ボタン */
        .btn-container {
            margin-top: 45px;
            text-align: center;
        }

        .btn-submit {
            background-color: var(--primary-blue);
            color: #ffffff;
            border: none;
            padding: 18px 80px;
            font-size: 16px;
            font-weight: 700;
            border-radius: 6px;
            cursor: pointer;
            transition: background-color 0.2s, transform 0.1s;
            box-shadow: 0 4px 14px rgba(0, 91, 172, 0.2);
        }

        .btn-retu {
            background-color: #939eae;
            color: #ffffff;
            border: none;
            padding: 19px 40px;
            font-size: 16px;
            font-weight: 700;
            border-radius: 6px;
            cursor: pointer;
            transition: background-color 0.2s, transform 0.1s;
            box-shadow: 0 4px 14px rgba(0, 91, 172, 0.2);
        }

        .btn-submit:hover {
            background-color: var(--primary-dark);
        }
        .btn-submit:active {
            transform: scale(0.98);
        }

        /* ーーー 4. 共通フッター ーーー */
        .site-footer {
            background-color: var(--footer-bg);
            color: #bdc3c7;
            padding: 60px 24px 30px;
            font-size: 14px;
            margin-top: 80px;
        }

        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .footer-grid {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 40px;
            margin-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding-bottom: 40px;
        }

        .footer-brand {
            max-width: 350px;
        }

        .footer-logo {
            font-size: 22px;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 15px;
        }

        .footer-sub {
            font-size: 12px;
            color: #94a3b8;
            margin-bottom: 15px;
            line-height: 1.4;
        }

        .footer-address {
            font-size: 13px;
            color: #cbd5e1;
            line-height: 1.6;
        }

        .footer-links-group {
            display: flex;
            gap: 60px;
            flex-wrap: wrap;
        }

        .footer-nav-col {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-nav-col h4 {
            color: #ffffff;
            margin: 0 0 4px 0;
            font-size: 15px;
            font-weight: 700;
        }

        .footer-nav-col a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s;
        }

        .footer-nav-col a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .footer-legal-links {
            display: flex;
            gap: 24px;
        }

        .footer-legal-links a {
            color: #64748b;
            text-decoration: none;
            font-size: 12px;
            transition: color 0.2s;
        }

        .footer-legal-links a:hover {
            color: #94a3b8;
        }

        .copyright {
            color: #64748b;
            font-size: 12px;
        }

        /* ーーー レスポンシブ対応 ーーー */
        @media (min-width: 640px) {
            .form-group, .corporate-field {
                flex-direction: row;
                align-items: flex-start;
            }
            .form-label-container {
                width: 250px;
                margin-bottom: 0;
                padding-top: 12px;
            }
            .form-input-container {
                flex: 1;
            }
        }

        @media (max-width: 768px) {
            .header-nav { display: none; }
            .footer-grid { flex-direction: column; gap: 30px; }
            .footer-links-group { gap: 40px; }
            .footer-bottom { flex-direction: column; align-items: flex-start; }
            .form-container { padding: 30px 20px; }
            .eyecatch-title { font-size: 24px; letter-spacing: 2px; }
            .header-logo-img { height: 34px; }
            .eyecatch-area { padding: 45px 15px; }
        }