.page-header {
    padding: 2.5rem 0 1.5rem;
}

.page-header .breadcrumb {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 0.8rem;
}

.page-header .breadcrumb a {
    color: var(--color-text-secondary);
}

.page-header .breadcrumb a:hover {
    color: var(--color-accent);
}

.page-header .breadcrumb .current {
    color: var(--color-text-primary);
    font-weight: 500;
}

.page-header h1 {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 0.5rem;
}

.two-column {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 2rem;
    align-items: start;
}

.preview-area {
    background: var(--color-surface);
    border-radius: var(--radius-card);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    width: var(--preview-width);
    max-width: 100%;
    min-height: var(--preview-height);
    display: flex;
    flex-direction: column;
    justify-self: center;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.preview-area img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
}

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.panel-card {
    background: var(--color-surface);
    border-radius: var(--radius-card);
    padding: 1.2rem 1.4rem;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}

.panel-card .card-title {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--color-text-muted);
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.panel-card .card-title i {
    color: var(--color-accent);
    font-size: 0.9rem;
    font-style: normal;
}

.field-row {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 0.3rem;
    border-radius: 8px;
    border: 1px solid transparent;
    transition: background 0.15s;
}

.field-row:last-child {
    margin-bottom: 0;
}

.field-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.field-value {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.3rem 0.5rem;
}

.field-value input[type="text"],
.field-value input[type="number"] {
    padding: 0.3rem 0.7rem;
    border: 1.5px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.8rem;
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    transition: 0.2s;
    width: 100%;
    min-width: 60px;
}

.field-value input[type="text"]:focus,
.field-value input[type="number"]:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
    background: var(--color-surface);
}

.field-value input[type="number"] {
    width: 36px;
    text-align: center;
    min-width: 24px;
    padding: 0;
}

.field-value select {
    padding: 0.2rem 0.6rem;
    border: 1.5px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.75rem;
    background: var(--color-surface);
    color: var(--color-text-primary);
    cursor: pointer;
    width: 80px;
}

.field-value select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.inline-mix {
    display: flex;
    align-items: center;
    gap: 0.2rem 0.5rem;
    flex-wrap: wrap;
}

.inline-mix .mix-label {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

.option-group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem;
}

.option-group input[type="radio"],
.option-group input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.option-group .opt-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.15rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1.5px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: 0.15s ease;
    min-width: 30px;
    height: 28px;
    font-family: var(--font-serif);
    user-select: none;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

.option-group .opt-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-light);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.option-group input[type="radio"]:checked+.opt-btn,
.option-group input[type="checkbox"]:checked+.opt-btn {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
    color: var(--color-accent);
    font-weight: 700;
    box-shadow: inset 0 1px 3px rgba(26, 115, 232, 0.1);
}

.opt-btn.key-sign {
    padding: 0.15rem 0.2rem;
}

.opt-btn.key-sign sup {
    position: relative;
    top: -0.4em;
    line-height: 1;
}

.opt-btn.note {
    font-size: 1.2rem;
}

.fraction {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    vertical-align: middle;
    line-height: 1.2;
}

.fraction .num {
    border-bottom: 1.5px solid currentColor;
    padding: 0 2px 1px;
    font-size: 0.8em;
}

.fraction .den {
    padding: 1px 2px 0;
    font-size: 0.8em;
}

.field-value .option-group {
    gap: 0.15rem;
}

.preview-toolbar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.4rem;
    padding-top: 1rem;
}

.preview-toolbar.message {
    font-size: 0.85rem;
    color: var(--color-danger);
}

@media (max-width: 1200px) {
    .two-column {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .preview-area {
        width: 100%;
        min-height: auto;
        padding: 1.2rem;
    }

    .preview-area .image-wrap {
        min-height: 200px;
    }

    .control-panel {
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 1rem;
    }
}

@media (max-width: 992px) {
    .control-panel {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .page-header {
        flex-direction: column;
        align-items: stretch;
    }

    .control-panel {
        grid-template-columns: 1fr;
    }

    .preview-area {
        padding: 0.8rem;
    }

    .container {
        padding: 0 0.8rem;
    }

    .field-row {
        flex-wrap: wrap;
        gap: 0.3rem;
        padding: 0.4rem 0.6rem;
    }

    .field-label {
        min-width: 100%;
        font-size: 0.7rem;
    }

    .field-value {
        width: 100%;
    }

    .preview-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 0.6rem;
    }

    .preview-toolbar .export-buttons {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .option-group .opt-btn {
        font-size: 0.65rem;
        padding: 0.1rem 0.4rem;
        min-width: 24px;
        height: 24px;
    }

    .field-value input[type="number"] {
        width: 44px;
    }
}