:root {
    color-scheme: light;
    --page-bg: #f8f9fa;
    --surface: #ffffff;
    --line-color: #dee2e6;
    --line-strong: #ced4da;
    --text-primary: #212529;
    --text-muted: #6c757d;
    --brand: #0d6efd;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--page-bg);
    color: var(--text-primary);
}

.page-main,
.page-shell {
    flex: 1 0 auto;
    padding-top: 5.5rem;
    padding-bottom: 2rem;
}

.card-foot-ad {
    background: #ffffff;
    border-top: 1px solid #e9ecef;
    color: var(--text-muted);
}

.card-foot-ad a {
    color: var(--brand);
    font-weight: 400;
}

.card-foot-ad a:hover {
    color: #0a58ca;
}

.compact-tool-shell {
    display: grid;
    gap: 1rem;
}

.compact-field {
    display: grid;
    gap: 0.5rem;
}

.compact-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
}

.compact-label-inline {
    align-items: center;
}

.compact-inline-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.35rem 0.78rem;
    border: 1px solid var(--line-color);
    border-radius: 999px;
    background: #ffffff;
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.2;
    transition: border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.compact-inline-toggle:hover,
.compact-inline-toggle:focus,
.compact-inline-toggle:focus-visible {
    border-color: #adb5bd;
    background: #f8f9fa;
    color: var(--text-primary);
    outline: 0;
}

.compact-inline-toggle.is-active {
    border-color: #9ec5fe;
    background: #eef4ff;
    color: #0a58ca;
}

.compact-input,
.compact-result-box {
    width: 100%;
    padding: 0.75rem 0.875rem;
    border: 1px solid var(--line-strong);
    border-radius: 0.75rem;
    background: #ffffff;
    color: var(--text-primary);
    box-shadow: none;
}

.compact-input::placeholder,
.compact-result-box::placeholder {
    color: var(--text-muted);
    opacity: 1;
}

.compact-input {
    min-height: 9rem;
    line-height: 1.6;
    resize: vertical;
}

.compact-input.single-line {
    min-height: 0;
    height: 2.75rem;
    resize: none;
    line-height: 1.4;
}

.compact-input:focus,
.compact-result-box:focus {
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.12);
    outline: 0;
}

.compact-input-row {
    position: relative;
}

.compact-input-row .compact-input {
    padding-right: 3rem;
}

.compact-result-shell {
    position: relative;
}

.compact-result-copy {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    z-index: 2;
    display: flex;
    pointer-events: none;
}

.compact-result-copy .compact-copy-btn {
    pointer-events: auto;
}

.compact-result-panel {
    position: relative;
}

.compact-result-box {
    min-height: 5.75rem;
    background: #f8f9fa;
    line-height: 1.55;
    resize: vertical;
    transition: border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.compact-result-box.has-copy-button {
    padding: 2.35rem 4rem 0.875rem 0.875rem;
}

.compact-batch-result {
    min-height: 11rem;
}

.compact-result-box.is-error {
    border-color: #f1aeb5;
    background: #fff5f5;
    color: #b02a37;
}

.compact-result-box.is-copied {
    border-color: #86efac;
    background: #f0fdf4;
    box-shadow: 0 0 0 1px rgba(25, 135, 84, 0.06);
}

.compact-copy-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    min-width: 1.8rem;
    height: 1.8rem;
    padding: 0 0.55rem;
    border: 1px solid #d0d7de;
    border-radius: 0.6rem;
    background: rgba(255, 255, 255, 0.96);
    color: #495057;
    font-size: 0.75rem;
    line-height: 1;
    white-space: nowrap;
    transition: border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.compact-copy-btn .bi {
    font-size: 0.78rem;
}

.compact-copy-btn:hover,
.compact-copy-btn:focus,
.compact-copy-btn:focus-visible {
    border-color: #adb5bd;
    background: #ffffff;
    color: var(--text-primary);
    outline: 0;
}

.compact-copy-btn.is-copied,
.compact-copy-btn.is-copied:hover,
.compact-copy-btn.is-copied:focus,
.compact-copy-btn.is-copied:focus-visible {
    border-color: #b7e4c7;
    background: #f0fdf4;
    color: #198754;
}

.compact-clear-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 2rem;
    height: 2rem;
    padding: 0;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.compact-input.single-line + .compact-clear-btn {
    top: 50%;
    transform: translateY(-50%);
}

.compact-clear-btn .bi {
    font-size: 0.875rem;
}

.tool-preview-empty {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.6;
    text-align: center;
}

.qr-preview-shell,
.color-preview-shell {
    display: grid;
    gap: 0.75rem;
}

.qr-preview-stage {
    min-height: 15rem;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    border: 1px dashed var(--line-color);
    border-radius: 0.875rem;
    background: #f8f9fa;
}

.qr-preview-stage canvas,
.qr-preview-stage img,
.qr-preview-stage svg {
    display: block;
    max-width: 100%;
    height: auto;
}

.qr-preview-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.gradient-preview-card {
    min-height: 10rem;
    border: 1px solid var(--line-color);
    border-radius: 1rem;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 0.35rem;
    color: #ffffff;
    background: linear-gradient(135deg, #64748b 0%, #0f172a 100%);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.gradient-preview-card strong {
    font-size: 0.95rem;
    font-weight: 700;
}

.gradient-preview-card span {
    font-size: 0.8rem;
    line-height: 1.5;
    word-break: break-word;
}

.color-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 0.75rem;
}

.color-swatch-card {
    overflow: hidden;
    border: 1px solid var(--line-color);
    border-radius: 0.875rem;
    background: #ffffff;
}

.color-swatch-sample {
    height: 96px;
}

.color-swatch-body {
    padding: 0.8rem;
    display: grid;
    gap: 0.25rem;
}

.color-swatch-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
}

.color-swatch-code,
.color-swatch-meta {
    font-size: 0.78rem;
    line-height: 1.5;
    word-break: break-word;
}

.color-swatch-code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    color: var(--text-primary);
}

.color-swatch-meta {
    color: var(--text-muted);
}

.compact-tool-shell .form-select,
.compact-tool-shell .form-control:not(.compact-input):not(.compact-result-box),
.compact-tool-shell .form-control-color {
    border-radius: 0.75rem;
}

.compact-tool-shell .form-control-color {
    min-height: 2.75rem;
    padding: 0.22rem;
}

.tool-action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tool-action-row > .btn {
    flex: 1 1 calc(50% - 0.25rem);
}

@media (max-width: 575.98px) {
    .page-main,
    .page-shell {
        padding-top: 5rem;
        padding-bottom: 1.5rem;
    }

    .compact-tool-shell {
        gap: 0.875rem;
    }

    .compact-field {
        gap: 0.45rem;
    }

    .compact-label {
        align-items: flex-start;
        flex-direction: column;
    }

    .compact-label-inline {
        align-items: center;
        flex-direction: row;
    }

    .compact-input.single-line,
    .compact-tool-shell .form-select {
        height: 2.625rem;
        font-size: 0.925rem;
    }

    .compact-tool-shell .form-control-color {
        min-height: 2.625rem;
    }

    .compact-result-box.has-copy-button {
        padding-right: 3.8rem;
    }

    .qr-preview-stage {
        min-height: 13rem;
        padding: 0.75rem;
    }

    .color-preview-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .color-swatch-sample {
        height: 82px;
    }
}

@media (min-width: 576px) {
    .tool-action-row > .btn {
        flex: 0 0 auto;
    }
}