:root {
    --bg: #f3f3f3;
    --bg-card: #ffffff;
    --bg-elevated: #fafafa;
    --bg-hover: #f0f0f0;
    --bg-active: #e8f1fb;
    --bg-input: #ffffff;
    --bg-code: #f6f8fa;

    --border: #e5e5e5;
    --border-strong: #d1d1d1;
    --border-focus: #0078d4;

    --text: #1f1f1f;
    --text-secondary: #616161;
    --text-tertiary: #8a8a8a;
    --text-disabled: #bdbdbd;

    --primary: #0078d4;
    --primary-hover: #106ebe;
    --primary-active: #005a9e;
    --primary-soft: #deecf9;

    --success: #107c10;
    --warning: #d83b01;
    --danger: #c50f1f;

    --tag-retail-bg: #deecf9;
    --tag-retail-text: #004578;
    --tag-volume-bg: #fde7e9;
    --tag-volume-text: #a4262c;
    --tag-m365-bg: #dff6dd;
    --tag-m365-text: #054b16;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.08);

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    --transition: 0.15s ease;
}

[data-theme="dark"] {
    --bg: #1f1f1f;
    --bg-card: #2b2b2b;
    --bg-elevated: #333333;
    --bg-hover: #383838;
    --bg-active: #1a3a5c;
    --bg-input: #383838;
    --bg-code: #1f1f1f;

    --border: #444444;
    --border-strong: #5c5c5c;
    --border-focus: #4cc2ff;

    --text: #f5f5f5;
    --text-secondary: #c8c8c8;
    --text-tertiary: #a0a0a0;
    --text-disabled: #6a6a6a;

    --primary: #4cc2ff;
    --primary-hover: #69caff;
    --primary-active: #79cdff;
    --primary-soft: #1a3a5c;

    --tag-retail-bg: #1a3a5c;
    --tag-retail-text: #99d6ff;
    --tag-volume-bg: #5a2024;
    --tag-volume-text: #ffa9a9;
    --tag-m365-bg: #1a3d20;
    --tag-m365-text: #92d894;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.4);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.5);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "PingFang SC", sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.5;
    transition: background var(--transition), color var(--transition);
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============ Header ============ */
.app-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    max-width: 1480px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-mark {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: linear-gradient(135deg, #d83b01 0%, #f25022 50%, #ffb900 100%);
    position: relative;
    flex-shrink: 0;
}

.logo-mark::after {
    content: "O";
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 18px;
}

.logo-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
}

.logo-subtitle {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    font-size: 16px;
}

.icon-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-strong);
}

/* ============ Layout ============ */
.layout {
    max-width: 1480px;
    margin: 0 auto;
    padding: 20px 24px;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 20px;
    width: 100%;
    flex: 1;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
}

.content {
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: 0;
}

/* ============ Card ============ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: var(--shadow-sm);
}

.card-flex {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.card-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.badge {
    background: var(--primary-soft);
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
}

/* ============ Search ============ */
.search-box {
    position: relative;
}

.search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
    font-size: 16px;
}

.search-box input {
    width: 100%;
    padding: 8px 12px 8px 32px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-input);
    color: var(--text);
    font-size: 13px;
    transition: border var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--border-focus);
}

/* ============ Filter Buttons ============ */
.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.filter-btn {
    padding: 5px 12px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition);
}

.filter-btn:hover {
    background: var(--bg-hover);
    color: var(--text);
}

.filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ============ Product List ============ */
.product-list {
    overflow-y: auto;
    flex: 1;
    max-height: calc(100vh - 480px);
    min-height: 300px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
}

.product-item {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background var(--transition);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.product-item:last-child {
    border-bottom: none;
}

.product-item:hover {
    background: var(--bg-hover);
}

.product-item.active {
    background: var(--bg-active);
    border-left: 3px solid var(--primary);
    padding-left: 9px;
}

.product-item-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    line-height: 1.3;
}

.product-item-meta {
    display: flex;
    gap: 6px;
    align-items: center;
    font-size: 11px;
    color: var(--text-tertiary);
}

/* ============ Tag ============ */
.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 500;
    line-height: 1.4;
}

.tag-retail       { background: var(--tag-retail-bg); color: var(--tag-retail-text); }
.tag-volume       { background: var(--tag-volume-bg); color: var(--tag-volume-text); }
.tag-subscription { background: var(--tag-m365-bg);   color: var(--tag-m365-text); }

.tag-family {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* ============ Form ============ */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px 16px;
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-row-wide {
    grid-column: 1 / -1;
}

.form-row label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.hint-inline {
    font-weight: 400;
    color: var(--text-tertiary);
    font-size: 11px;
}

.hint {
    font-size: 12px;
    color: var(--text-tertiary);
}

input,
select,
textarea {
    width: 100%;
    padding: 7px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-input);
    color: var(--text);
    font-size: 13px;
    font-family: inherit;
    transition: border var(--transition);
}

select {
    appearance: none;
    background-image: linear-gradient(45deg, transparent 50%, var(--text-secondary) 50%),
                      linear-gradient(135deg, var(--text-secondary) 50%, transparent 50%);
    background-position: calc(100% - 16px) 50%, calc(100% - 11px) 50%;
    background-size: 5px 5px, 5px 5px;
    background-repeat: no-repeat;
    padding-right: 28px;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--border-focus);
}

textarea {
    height: 110px;
    resize: vertical;
    font-family: Consolas, "SF Mono", "Cascadia Code", monospace;
    font-size: 12px;
    line-height: 1.5;
}

/* ============ Segmented Control ============ */
.seg-control {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-input);
    width: fit-content;
}

.seg-btn {
    padding: 7px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: all var(--transition);
    min-width: 80px;
}

.seg-btn:not(:last-child) {
    border-right: 1px solid var(--border);
}

.seg-btn:hover {
    background: var(--bg-hover);
}

.seg-btn.active {
    background: var(--primary);
    color: white;
}

/* ============ Checkbox / Tag list ============ */
.checkbox-group,
.lang-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    max-height: 180px;
    overflow-y: auto;
}

.check-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    border-radius: 12px;
    cursor: pointer;
    font-size: 12px;
    color: var(--text);
    user-select: none;
    transition: all var(--transition);
}

.check-tag:hover {
    background: var(--bg-hover);
    border-color: var(--border-strong);
}

.check-tag input {
    width: 14px;
    height: 14px;
    margin: 0;
    padding: 0;
    cursor: pointer;
    accent-color: var(--primary);
}

.check-tag.checked {
    background: var(--primary-soft);
    border-color: var(--primary);
    color: var(--text);
}

/* ============ Buttons ============ */
.button-row {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}

.btn-primary,
.btn-secondary {
    padding: 8px 18px;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: white;
}

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

.btn-primary:active {
    background: var(--primary-active);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text);
    border-color: var(--border-strong);
}

.btn-secondary:hover {
    background: var(--bg-hover);
}

.btn-primary:disabled,
.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============ Product Info ============ */
.empty-hint {
    color: var(--text-tertiary);
    text-align: center;
    padding: 24px 0;
    font-size: 13px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px 20px;
    margin-top: 4px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.info-value {
    font-size: 13px;
    color: var(--text);
    word-break: break-all;
}

.info-value code {
    background: var(--bg-code);
    border: 1px solid var(--border);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: Consolas, "SF Mono", monospace;
    font-size: 12px;
}

.app-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
}

.app-chip {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    color: var(--text-secondary);
}

.app-chip.addon {
    background: var(--tag-m365-bg);
    color: var(--tag-m365-text);
    border-color: transparent;
}

.product-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 4px 0;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
}

.key-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 14px;
    padding: 10px 14px;
    background: var(--bg-code);
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-md);
}

.key-row code {
    font-family: Consolas, "SF Mono", monospace;
    font-size: 13px;
    color: var(--text);
    letter-spacing: 0.5px;
    flex: 1;
}

.key-row .btn-secondary {
    padding: 4px 12px;
    font-size: 12px;
}

code {
    font-family: Consolas, "SF Mono", monospace;
    font-size: 12px;
}

/* ============ Toast ============ */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 10px 20px;
    background: rgba(0, 0, 0, 0.85);
    color: white;
    border-radius: var(--radius-md);
    font-size: 13px;
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s ease;
    z-index: 1000;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============ Scrollbar ============ */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* ============ Responsive ============ */
@media (max-width: 980px) {
    .layout {
        grid-template-columns: 1fr;
        padding: 14px;
    }

    .product-list {
        max-height: 340px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .header-inner {
        padding: 12px 16px;
    }

    .logo-subtitle {
        display: none;
    }
}