function assemble_season(DateTime $date, array $astro) {

    /* ---------------------------------------------
     * 0. 辞書の読み込み
     * --------------------------------------------- */
    $zassetsu_dict     = json_decode(file_get_contents(__DIR__ . '/../data/zassetsu.json'), true);
    $sekku_dict        = json_decode(file_get_contents(__DIR__ . '/../data/sekku.json'), true);
    $flowers_dict      = json_decode(file_get_contents(__DIR__ . '/../data/flowers.json'), true);
    $birds_dict        = json_decode(file_get_contents(__DIR__ . '/../data/birds-new.json'), true);
    $memories_dict     = json_decode(file_get_contents(__DIR__ . '/../data/memories.json'), true);
    $birds_poem_dict   = json_decode(file_get_contents(__DIR__ . '/../data/poem/birds-poem.json'), true);

    $sekki_index = json_decode(file_get_contents(get_stylesheet_directory() . '/data/sekki-index.json'), true);
    $kou_index   = json_decode(file_get_contents(get_stylesheet_directory() . '/data/kou-index.json'), true);
    $kou_yomi_dict = json_decode(file_get_contents(get_stylesheet_directory() . '/data/kou-yomi.json'), true);
    $poem_kou    = json_decode(file_get_contents(get_stylesheet_directory() . '/data/poem/poem-kou.json'), true);
    $flowers_poem_dict = json_decode(file_get_contents(__DIR__ . '/../data/poem/flowers-poem.json'), true);

    /* ---------------------------------------------
     * A. 今日の節気
     * --------------------------------------------- */
    $sekki_dates_all = loadSekkiData();
    $year = (int)$date->format('Y');
    $today_ts = $date->getTimestamp();

    $today_sekki = null;
    $next_sekki  = null;

    if (isset($sekki_dates_all[$year])) {
        foreach ($sekki_dates_all[$year] as $name => $mdhm) {
            $start_ts = (new DateTime($mdhm))->getTimestamp();
            if ($start_ts <= $today_ts) {
                $today_sekki = $name;
            } elseif (!$next_sekki) {
                $next_sekki = $name;
            }
        }
    }

    /* ---------------------------------------------
     * B. 候
     * --------------------------------------------- */
    $days = 0;
    if ($today_sekki && isset($sekki_dates_all[$year][$today_sekki])) {
        $sekki_start = new DateTime($sekki_dates_all[$year][$today_sekki]);
        $days = (int)$date->diff($sekki_start)->format('%a');
    }

    $kou_index_in_sekki = min(2, floor($days / 5));
    $sekki_data = $sekki_index[$today_sekki] ?? null;
    $sekki_icon = $sekki_data['icon'] ?? 'sekki-1';
    $sekki_id   = intval(str_replace('sekki-', '', $sekki_icon));

    $kou_number = $sekki_id * 3 + $kou_index_in_sekki;
    $kou_icon   = sprintf("kou-%02d", $kou_number);

    $kou_name = $kou_index[$kou_icon] ?? null;
    $kou_poem_raw = $kou_name && isset($poem_kou[$kou_name]) ? $poem_kou[$kou_name] : [];
    $kou_yomi = $kou_yomi_dict[$kou_name] ?? '';
    $kou_poem_long = function_exists('build_kou_long') ? build_kou_long($kou_poem_raw) : '';

    $poem_short_data = json_decode(file_get_contents(__DIR__ . '/../data/poem/koupoem-short.json'), true);

    $season = [];
    $season['sekki'] = [
        'name' => $today_sekki,
        'icon' => $sekki_icon,
        'desc' => $sekki_data['desc'] ?? ''
    ];

    $season['kou'] = [
        'name' => $kou_name,
        'yomi' => $kou_yomi,
        'icon' => $kou_icon,
        'poem_long' => $kou_poem_long,
        'poem_short' => $poem_short_data[$kou_name] ?? ''
    ];

    /* ---------------------------------------------
     * C. 花・鳥の抽選（最優先でここ）
     * --------------------------------------------- */
    $solar_month = (int)$date->format('n');
    $month_key = $solar_month . '月';

    $flowers = $flowers_dict[$month_key] ?? [];
    $birds   = $birds_dict[(string)$solar_month] ?? [];

    $flower_name = !empty($flowers) ? $flowers[array_rand($flowers)] : null;

    $bird_name = null;
    if (!empty($birds)) {
        $b = $birds[array_rand($birds)];
        $bird_name = is_array($b) ? ($b['name'] ?? null) : $b;
    }

    /* ---------------------------------------------
     * D. 鳥の詩辞書整形（抽選後に必ずここ）
     * --------------------------------------------- */
    if (isset($birds_poem_dict[(string)$solar_month])) {
        $birds_poem_dict = $birds_poem_dict[(string)$solar_month];
    }

    $birds_poem_dict_converted = [];
    foreach ($birds_poem_dict as $item) {
        if (!empty($item['keyword'])) {
            $birds_poem_dict_converted[$item['keyword']] = [
                'myth'       => $item['myth'] ?? '',
                'appearance' => $item['appearance'] ?? '',
                'description'=> $item['description'] ?? '',
            ];
        }
    }
    $birds_poem_dict = $birds_poem_dict_converted;

    /* ---------------------------------------------
     * E. 鳥の詩抽出
     * --------------------------------------------- */
    $bird_poem = $birds_poem_dict[$bird_name] ?? [
        'myth'       => '',
        'appearance' => '',
        'description'=> $bird_name ? "{$bird_name}が季節の気配をそっと運ぶ。" : ''
    ];

    $season['bird'] = [
        'name'        => $bird_name,
        'myth'        => $bird_poem['myth'],
        'appearance'  => $bird_poem['appearance'],
        'description' => $bird_poem['description'],
    ];

    /* ---------------------------------------------
     * F. 花の詩抽出
     * --------------------------------------------- */
    $flower_poem = $flower_name && isset($flowers_poem_dict[$flower_name])
        ? $flowers_poem_dict[$flower_name]
        : [
            'myth'       => '',
            'appearance' => '',
            'description'=> $flower_name ? "{$flower_name}が季節をそっと彩る。" : ''
        ];

    $season['flower'] = [
        'name'        => $flower_name,
        'myth'        => $flower_poem['myth'],
        'appearance'  => $flower_poem['appearance'],
        'description' => $flower_poem['description'],
    ];

    /* ---------------------------------------------
     * G. 旧暦
     * --------------------------------------------- */
    $k = function_exists('calc_kyureki') ? calc_kyureki($date) : ['wafuu' => '', 'month' => 1, 'day' => 1];

    $month_reading = [
        '睦月'=>'むつき','如月'=>'きさらぎ','弥生'=>'やよい','卯月'=>'うづき',
        '皐月'=>'さつき','水無月'=>'みなづき','文月'=>'ふづき','葉月'=>'はづき',
        '長月'=>'ながつき','神無月'=>'かんなづき','霜月'=>'しもつき','師走'=>'しわす'
    ];

    $age = $astro['moon']['age_float'] ?? null;

    $season['kyureki'] = [
        'date'        => function_exists('formatKyurekiDate') ? formatKyurekiDate($k) : '',
        'month_name'  => $k['wafuu'] ?? '',
        'reading'     => $month_reading[$k['wafuu'] ?? ''] ?? '',
        'month_num'   => $k['month'] ?? 1,
        'day_num'     => $k['day'] ?? 1,
        'is_leap'     => $k['is_leap'] ?? false,
        'is_saku'     => ($age !== null && $age < 0.5),
        'is_mochi'    => ($age !== null && abs($age - 15) < 0.5),
    ];

    /* ---------------------------------------------
     * H. 五節句
     * --------------------------------------------- */
    $today_sekku = null;
    if (is_array($sekku_dict)) {
        foreach ($sekku_dict as $s) {
            if (($s['month'] == $solar_month && $s['day'] == (int)$date->format('j')) ||
                ($s['month'] == ($k['month'] ?? 1) && $s['day'] == ($k['day'] ?? 1))) {
                $today_sekku = $s;
            }
        }
    }
    $season['sekku'] = $today_sekku;

    /* ---------------------------------------------
     * I. 行事判定
     * --------------------------------------------- */
    $astro['kyureki'] = $season['kyureki'];
    $season['events'] = assemble_season_events($date, $astro);

    /* ---------------------------------------------
     * J. 季の気配
     * --------------------------------------------- */
    if ($flower_name && $bird_name) {
        $season['feel'] =
            "{$k['wafuu']}の空気がいつしか満ち、{$flower_name}の花にいやされ、\n" .
            "{$bird_name}達の気配に心弾む。";
    } else {
        $season['feel'] =
            "{$k['wafuu']}の空気が静かに満ち、いつしか花や鳥の気配に包まれる。";
    }

    /* ---------------------------------------------
     * K. 記憶
     * --------------------------------------------- */
    $memories_today = array_filter($memories_dict ?? [], fn($m) => ($m['month'] ?? 0) == $solar_month);
    $season['memory'] = $memories_today ? $memories_today[array_rand($memories_today)] : null;

    return $season;
}
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