:root {
    --bg: #f5f4f0;
    --surface: #ffffff;
    --border: #e0ddd6;
    --border-focus: #1a1a1a;
    --text: #1a1a1a;
    --text-muted: #888880;
    --accent: #1a1a1a;
    --accent-light: #f0ede8;
    --danger: #c0392b;
    --danger-light: #fdf0ee;
    --success: #27ae60;
    --mono: 'IBM Plex Mono', monospace;
    --sans: 'IBM Plex Sans', sans-serif;
    --radius: 4px;
    --transition: 150ms ease;
}

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

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    font-size: 14px;
    line-height: 1.5;
}

header {
    background: var(--accent);
    color: #fff;
    padding: 20px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

    header .brand {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    header .logo {
        font-family: var(--mono);
        font-size: 13px;
        font-weight: 500;
        letter-spacing: 0.08em;
        opacity: 0.5;
    }

    header h1 {
        font-size: 15px;
        font-weight: 500;
        letter-spacing: 0.02em;
    }

    header .sep {
        opacity: 0.25;
        margin: 0 4px;
    }

.btn {
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.06em;
    padding: 8px 18px;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
}

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

    .btn-primary:hover {
        background: #e8e8e8;
    }

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 1px solid rgba(255,255,255,0.3);
}

    .btn-secondary:hover {
        background: rgba(255,255,255,0.08);
    }

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    font-size: 11px;
    padding: 5px 12px;
}

    .btn-danger:hover {
        background: var(--danger-light);
    }

.btn-ghost {
    background: var(--accent-light);
    color: var(--accent);
    font-size: 11px;
    padding: 5px 12px;
}

    .btn-ghost:hover {
        background: #e4e0d8;
    }

main {
    max-width: 860px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

.tools-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tool-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: box-shadow var(--transition);
}

    .tool-card:focus-within {
        box-shadow: 0 0 0 2px var(--accent);
    }

.tool-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: var(--accent-light);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    user-select: none;
}

.tool-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.tool-index {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text-muted);
    min-width: 24px;
}

.tool-name-preview {
    font-family: var(--mono);
    font-size: 13px;
    font-weight: 500;
}

    .tool-name-preview.empty {
        color: var(--text-muted);
        font-style: italic;
        font-family: var(--sans);
        font-weight: 300;
    }

.tool-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.chevron {
    width: 16px;
    height: 16px;
    transition: transform var(--transition);
    opacity: 0.4;
}

.tool-card.collapsed .chevron {
    transform: rotate(-90deg);
}

.tool-card.collapsed .tool-body {
    display: none;
}

.tool-body {
    padding: 24px 20px;
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

    .field label {
        font-size: 11px;
        font-weight: 500;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--text-muted);
    }

        .field label .req {
            color: var(--danger);
            margin-left: 2px;
        }

    .field input, .field select, .field textarea {
        font-family: var(--mono);
        font-size: 13px;
        padding: 8px 12px;
        border: 1px solid var(--border);
        border-radius: var(--radius);
        background: var(--bg);
        color: var(--text);
        transition: border-color var(--transition);
        outline: none;
    }

        .field input:focus, .field select:focus, .field textarea:focus {
            border-color: var(--border-focus);
            background: #fff;
        }

    .field textarea {
        resize: vertical;
        min-height: 72px;
    }

    .field select {
        appearance: none;
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
        background-repeat: no-repeat;
        background-position: right 10px center;
        padding-right: 28px;
    }

.section-label {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-top: 4px;
    margin-bottom: 2px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.auth-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.auth-row {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 16px;
}

.params-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.param-row {
    display: grid;
    grid-template-columns: 1fr 80px 1fr 90px 28px;
    gap: 8px;
    align-items: center;
}

    .param-row input, .param-row select {
        font-family: var(--mono);
        font-size: 12px;
        padding: 6px 10px;
        border: 1px solid var(--border);
        border-radius: var(--radius);
        background: var(--bg);
        color: var(--text);
        outline: none;
        width: 100%;
    }

        .param-row input:focus, .param-row select:focus {
            border-color: var(--border-focus);
            background: #fff;
        }

    .param-row select {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
        background-repeat: no-repeat;
        background-position: right 8px center;
        padding-right: 22px;
        appearance: none;
    }

.param-header {
    display: grid;
    grid-template-columns: 1fr 80px 1fr 90px 28px;
    gap: 8px;
    padding-bottom: 4px;
}

    .param-header span {
        font-size: 10px;
        font-weight: 500;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--text-muted);
    }

.btn-remove-param {
    width: 28px;
    height: 28px;
    border: 1px solid var(--border);
    background: transparent;
    border-radius: var(--radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 16px;
    line-height: 1;
    transition: var(--transition);
    flex-shrink: 0;
}

    .btn-remove-param:hover {
        border-color: var(--danger);
        color: var(--danger);
        background: var(--danger-light);
    }

.add-tool-btn {
    border: 1px dashed var(--border);
    background: transparent;
    border-radius: var(--radius);
    padding: 14px;
    width: 100%;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--text-muted);
    cursor: pointer;
    letter-spacing: 0.06em;
    transition: var(--transition);
    text-transform: uppercase;
}

    .add-tool-btn:hover {
        border-color: var(--accent);
        color: var(--accent);
        background: var(--accent-light);
    }

.footer-actions {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 16px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 100;
}

    .footer-actions .left {
        display: flex;
        align-items: center;
        gap: 12px;
    }

.footer-counter {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--text-muted);
}

.toast {
    position: fixed;
    bottom: 80px;
    right: 24px;
    background: var(--accent);
    color: #fff;
    font-family: var(--mono);
    font-size: 12px;
    padding: 10px 18px;
    border-radius: var(--radius);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 200ms, transform 200ms;
    pointer-events: none;
    z-index: 200;
}

    .toast.show {
        opacity: 1;
        transform: translateY(0);
    }

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
    font-size: 13px;
}

    .empty-state .icon {
        font-size: 32px;
        margin-bottom: 12px;
        opacity: 0.4;
    }

@media (max-width: 600px) {
    header {
        padding: 14px 16px;
    }

    main {
        padding: 24px 16px 80px;
    }

    .field-row {
        grid-template-columns: 1fr;
    }

    .auth-row {
        grid-template-columns: 1fr;
    }

    .param-row {
        grid-template-columns: 1fr 1fr;
    }

        .param-row .param-desc, .param-row .param-req {
            display: none;
        }

    .param-header {
        display: none;
    }

    .footer-actions {
        padding: 12px 16px;
    }
}