def get_css():
    return """
    @import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&display=swap');
    /* === 基本設定 === */
    body, .gradio-container, .prose, button, input, textarea, span, div, label {
        font-family: 'JetBrains Mono', monospace !important;
        letter-spacing: -0.03em;
    }
    body, .gradio-container {
        background-color: #020617 !important;
        background-image: radial-gradient(circle at 50% 0%, #0f172a 0%, #020617 80%);
        color: #34d399 !important; 
    }
    /* === タイトル === */
    .title-area {
        margin-bottom: 20px;
        text-align: center;
        padding-top: 20px;
        border-bottom: 1px solid rgba(52, 211, 153, 0.2);
        padding-bottom: 10px;
    }
    .title-area h1 {
        font-size: 2.5rem !important;
        font-weight: 700;
        letter-spacing: 0.1em;
        color: #34d399 !important;
        text-shadow: 0 0 15px rgba(52, 211, 153, 0.3);
        margin-bottom: 0.2rem;
    }
    .subtitle {
        font-size: 0.75rem !important;
        color: #6ee7b7 !important;
        opacity: 0.8;
    }
    .description {
        font-size: 0.75rem !important;
        color: #94a3b8 !important;
        opacity: 0.9;
        margin: 0 auto 20px auto;
        line-height: 1.6;
        text-align: left !important;
        padding: 15px 20px;
        background: rgba(15, 23, 42, 0.5);
        border-radius: 4px;
        border-left: 2px solid #10b981;
    }
    .description a {
        color: #34d399 !important;
        text-decoration: underline;
    }
    .description p {
        text-align: left !important;
        margin: 0 !important;
    }
    /* === Column spacing === */
    .main-row {
        gap: 24px !important;
    }
    .main-row > div {
        min-height: 700px;
    }
    /* === 枠 (Glass Frame) === */
    .step-frame {
        background: rgba(2, 6, 23, 0.7) !important;
        border: 1px solid #10b981 !important;
        border-radius: 4px !important;
        padding: 12px 16px !important;
        margin-bottom: 12px !important;
        transition: all 0.3s ease !important;
        box-shadow: 0 0 10px rgba(16, 185, 129, 0.05);
        height: 100%; 
        display: flex;
        flex-direction: column;
    }
    #right-panel {
        min-height: 600px;
    }
    .step-active {
        border-color: #34d399 !important;
        box-shadow: 0 0 20px rgba(16, 185, 129, 0.2) !important;
        opacity: 1 !important;
    }
    .step-inactive {
        border-color: #1e293b !important;
        opacity: 0.3 !important;
        pointer-events: none;
    }
    .step-label {
        font-size: 0.75rem;
        font-weight: 700;
        color: #34d399 !important;
        text-transform: uppercase;
        letter-spacing: 0.1em;
        margin-bottom: 8px;
        display: block;
        text-shadow: 0 0 5px rgba(52, 211, 153, 0.4);
    }
    .step-hint {
        font-size: 0.7rem !important;
        color: #6ee7b7 !important;
        opacity: 0.7;
        margin-bottom: 8px;
    }
    /* === 入力パーツ === */
    label span {
        font-size: 0.7rem !important;
        margin-bottom: 4px !important;
        color: #6ee7b7 !important;
    }
    textarea, input {
        background-color: #020617 !important;
        border: 1px solid #10b981 !important;
        color: #34d399 !important;
        border-radius: 2px !important;
        font-size: 0.9rem !important;
        padding: 4px 8px !important;
    }
    /* Editable inputs should be white */
    input:not([readonly]):not(:disabled),
    textarea:not([readonly]):not(:disabled) {
        color: #ffffff !important;
    }
    /* Dropdown inputs white when editable */
    .svelte-1gfkn6j input {
        color: #ffffff !important;
    }
    /* Disabled dropdown styling */
    .svelte-1gfkn6j[disabled],
    .svelte-1gfkn6j:disabled,
    input:disabled,
    textarea:disabled {
        opacity: 0.4 !important;
        cursor: not-allowed !important;
    }
    ::placeholder { color: #059669 !important; opacity: 0.7; }
    textarea:focus, input:focus {
        border-color: #34d399 !important;
        box-shadow: 0 0 10px rgba(52, 211, 153, 0.2) !important;
    }
    input[type=number] { color: #ffffff !important; }
    /* === タスクカード & ボタン === */
    button {
        text-transform: uppercase !important;
        letter-spacing: 0.05em !important;
        font-weight: 700 !important;
        border-radius: 2px !important;
    }
    .task-card {
        height: 45px !important;
        min-height: 45px !important;
        background: #0f172a !important;
        border: 1px solid #10b981 !important;
        color: #34d399 !important;
        font-size: 0.75rem !important;
    }
    .task-card:hover {
        background: #10b981 !important;
        color: #020617 !important;
        box-shadow: 0 0 15px rgba(16, 185, 129, 0.4);
    }
    /* Active/selected task card - Gradio primary variant */
    .task-card.primary,
    .task-card[data-variant="primary"],
    button.primary.task-card,
    .task-card.svelte-cmf5ev.primary {
        background: #10b981 !important;
        color: #020617 !important;
        box-shadow: 0 0 15px rgba(16, 185, 129, 0.4) !important;
        border-color: #34d399 !important;
    }
    /* === Dropdown options styling === */
    ul[role="listbox"],
    .options,
    [data-testid="dropdown-options"],
    .dropdown-options,
    div[class*="dropdown"] ul {
        background-color: #1e293b !important;
        border: 1px solid #10b981 !important;
        max-height: 300px;
        overflow-y: auto;
    }
    ul[role="listbox"] li,
    .options li,
    [data-testid="dropdown-options"] li,
    .dropdown-options li,
    div[class*="dropdown"] ul li {
        background-color: #1e293b !important;
        color: #34d399 !important;
        padding: 8px 12px !important;
    }
    ul[role="listbox"] li:hover,
    .options li:hover,
    [data-testid="dropdown-options"] li:hover,
    .dropdown-options li:hover,
    div[class*="dropdown"] ul li:hover,
    ul[role="listbox"] li.selected,
    ul[role="listbox"] li[aria-selected="true"],
    .options li.selected {
        background-color: #334155 !important;
        color: #ffffff !important;
    }
    /* === チャット入力エリア (Step 3) === */
    .input-area {
        display: flex;
        align-items: flex-end;
        gap: 10px;
        margin-top: auto;
        padding-top: 10px;
    }
    
    #prompt-preview textarea {
        background-color: #1e293b !important;
        border: 1px solid #34d399 !important;
        color: #34d399 !important;
        font-size: 0.85rem !important;
        line-height: 1.4 !important;
    }
    #send-btn {
        background: #34d399 !important;
        color: #020617 !important;
        border: none !important;
        width: 50px !important;
        height: 50px !important;
        font-size: 1.5rem !important;
        border-radius: 8px !important;
        display: flex;
        align-items: center;
        justify-content: center;
        padding-bottom: 4px !important;
        transition: all 0.2s ease;
    }
    #send-btn:hover {
        transform: scale(1.05);
        box-shadow: 0 0 15px rgba(52, 211, 153, 0.6);
    }
    /* Stop button style */
    .stop-btn {
        background: #ef4444 !important;
        color: white !important;
    }
    .stop-btn:hover {
        background: #dc2626 !important;
        box-shadow: 0 0 15px rgba(239, 68, 68, 0.6) !important;
    }
    /* === チャットボット (バブルデザイン) === */
    .bubble-wrap { background: transparent !important; }
    
    .user {
        background-color: #1e293b !important;
        color: #34d399 !important;
        border: 1px solid #10b981 !important;
        border-radius: 12px 12px 0 12px !important;
        padding: 12px !important;
        margin-bottom: 8px !important;
        text-align: right;
        margin-left: auto;
        max-width: 80%;
    }
    
    .bot {
        background-color: #020617 !important;
        color: #34d399 !important;
        border: 1px solid #34d399 !important;
        border-radius: 12px 12px 12px 0 !important;
        padding: 12px !important;
        margin-bottom: 16px !important;
        text-align: left;
        margin-right: auto;
        max-width: 80%;
        box-shadow: 0 0 10px rgba(16, 185, 129, 0.1);
    }
    
    /* アバター隠し */
    .avatar-container { display: none !important; }
    /* === 実行秒数・タイマー・API表示を非表示にする設定 === */
    .generating, 
    .progress-text, 
    .meta-text, 
    .meta-text-center,
    .eta-bar,
    footer { 
        display: none !important; 
    }
    .loading-wrap {
        display: none !important;
    }
    """