#app {
    --ico-primary: #4a6cf7;
    --ico-primary-dark: #3b5de0;
    --ico-radius: 14px;
    --ico-border: #e3e6ef;
    --ico-accent-bg: #eef1fe;
}

#app .ico-upload-card {
    padding: 0;
    overflow: hidden;
}

#app .ico-drop {
    border: 2px dashed var(--ico-border);
    border-radius: var(--ico-radius);
    margin: 18px;
    padding: 38px 20px;
    text-align: center;
    cursor: pointer;
    background: linear-gradient(180deg, #fafbff 0%, #f4f6fd 100%);
    transition: border-color .18s, background .18s, box-shadow .18s;
}

#app .ico-drop:hover {
    border-color: var(--ico-primary);
    background: linear-gradient(180deg, #f6f8ff 0%, #eef1fe 100%);
}

#app .ico-drop.dragover {
    border-color: var(--ico-primary);
    box-shadow: 0 0 0 4px rgba(74,108,247,.12);
    background: var(--ico-accent-bg);
}

#app .ico-drop-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--ico-primary);
}

#app .ico-drop-title {
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--text);
    margin: 4px 0 0;
}

#app .ico-drop-sub {
    font-size: .82rem;
    color: var(--text-secondary);
    margin: 0;
    max-width: 440px;
    line-height: 1.6;
}

#app .ico-source {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 18px;
    padding: 14px;
    border: 1px solid var(--ico-border);
    border-radius: var(--ico-radius);
    background: var(--bg);
}

#app .ico-source-thumb {
    width: 64px;
    height: 64px;
    border-radius: 10px;
    overflow: hidden;
    flex: none;
    background-color: #fff;
    background-image:
        linear-gradient(45deg, #e9ecf5 25%, transparent 25%),
        linear-gradient(-45deg, #e9ecf5 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #e9ecf5 75%),
        linear-gradient(-45deg, transparent 75%, #e9ecf5 75%);
    background-size: 14px 14px;
    background-position: 0 0, 0 7px, 7px -7px, -7px 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

#app .ico-source-thumb img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

#app .ico-source-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

#app .ico-source-meta #icoSourceName {
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#app .ico-source-size {
    font-size: .8rem;
    color: var(--text-secondary);
}

#app .btn-ghost {
    align-self: flex-start;
    margin-top: 4px;
    border: 1px solid var(--ico-border);
    background: var(--bg);
    color: var(--text);
    border-radius: 8px;
    padding: 5px 12px;
    font-size: .82rem;
    cursor: pointer;
    transition: border-color .15s, color .15s;
}

#app .btn-ghost:hover {
    border-color: var(--ico-primary);
    color: var(--ico-primary);
}

#app .ico-msg {
    margin: 0 18px 18px;
    padding: 10px 14px;
    border-radius: 10px;
    font-size: .85rem;
    background: #fdecec;
    color: #c0392b;
    border: 1px solid #f5c6c6;
}

/* 选项区布局 */
#app .ico-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 16px;
}

#app .ico-opts,
#app .ico-preview-card {
    padding: 18px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--ico-radius);
}

#app .ico-hint {
    font-size: .8rem;
    color: var(--text-secondary);
    margin: 6px 0 12px;
    line-height: 1.6;
}

#app .ico-size-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

#app .ico-size {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--ico-border);
    border-radius: 10px;
    padding: 10px 0;
    font-size: .82rem;
    cursor: pointer;
    background: var(--bg);
    transition: border-color .15s, background .15s, color .15s;
    user-select: none;
}

#app .ico-size input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

#app .ico-size:hover {
    border-color: var(--ico-primary);
}

#app .ico-size:has(input:checked) {
    border-color: var(--ico-primary);
    background: var(--ico-accent-bg);
    color: var(--ico-primary-dark);
    font-weight: 600;
}

#app .ico-radio-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

#app .ico-radio {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid var(--ico-border);
    border-radius: 10px;
    padding: 9px 14px;
    font-size: .85rem;
    cursor: pointer;
    background: var(--bg);
    transition: border-color .15s, background .15s, color .15s;
    user-select: none;
}

#app .ico-radio input {
    accent-color: var(--ico-primary);
}

#app .ico-radio.active {
    border-color: var(--ico-primary);
    background: var(--ico-accent-bg);
    color: var(--ico-primary-dark);
    font-weight: 600;
}

#app .ico-subopt {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 14px;
    padding: 12px 14px;
    border-radius: 10px;
    background: #f7f8fc;
    border: 1px solid var(--ico-border);
}

#app .ico-color-label {
    font-size: .85rem;
    color: var(--text);
}

#app .ico-subopt input[type="color"] {
    width: 38px;
    height: 30px;
    border: 1px solid var(--ico-border);
    border-radius: 8px;
    background: none;
    cursor: pointer;
    padding: 2px;
}

#app .ico-subopt input[type="range"] {
    flex: 1;
    accent-color: var(--ico-primary);
}

#app .ico-color-hex {
    font-size: .82rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
    min-width: 44px;
}

/* 预览 */
#app .ico-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
    gap: 14px;
}

#app .ico-prev {
    text-align: center;
}

#app .ico-prev-board {
    height: 92px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--ico-border);
}

#app .ico-prev-board.light {
    background:
        linear-gradient(45deg, #eef0f6 25%, transparent 25%),
        linear-gradient(-45deg, #eef0f6 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #eef0f6 75%),
        linear-gradient(-45deg, transparent 75%, #eef0f6 75%);
    background-color: #fbfcff;
    background-size: 14px 14px;
    background-position: 0 0, 0 7px, 7px -7px, -7px 0;
}

#app .ico-prev-board.dark {
    background: #2b2f3a;
}

#app .ico-prev-board canvas {
    image-rendering: auto;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,.12);
}

#app .ico-prev-label {
    margin-top: 7px;
    font-size: .78rem;
    color: var(--text-secondary);
}

#app .ico-prev-duo {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

/* 操作区 */
#app .ico-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 16px;
}

#app .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--ico-primary);
    color: #fff;
    border: none;
    border-radius: 10px;
    padding: 12px 22px;
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s, transform .05s;
}

#app .btn-primary:hover {
    background: var(--ico-primary-dark);
}

#app .btn-primary:active {
    transform: scale(.98);
}

#app .btn-primary:disabled {
    opacity: .6;
    cursor: progress;
}

#app .ico-actions-tip {
    font-size: .82rem;
    color: var(--text-secondary);
}

#app .ico-help {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: .86rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

#app .ico-help p {
    margin: 0;
}

@media (max-width: 720px) {
    #app .ico-grid {
        grid-template-columns: 1fr;
    }
    #app .ico-size-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    #app .ico-preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }
}