/* ============================================================
   意见反馈 · 关于作者
   ------------------------------------------------------------
   命名空间 .fbk-*，自成一体：
   - 只消费 design-tokens / app-redesign 的既有变量，不新增调色板
   - 不覆写任何既有选择器（唯一的例外是在 .il-modal-overlay 上切换显隐，
     因为该外壳自带 display:flex）
   - 不使用 !important，不参与既有的样式覆盖层
   ============================================================ */

/* ------------------------------------------------------------
   1. 右下角双悬浮按钮
   ------------------------------------------------------------ */
.fbk-fabs {
    position: fixed;
    right: var(--space-6);
    bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
    z-index: var(--z-fixed);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    transition: opacity var(--transition-slow);
}

/* 沉浸式页面空闲时降低存在感，鼠标靠近或恢复操作后立刻还原 */
.fbk-fabs--dim {
    opacity: 0.3;
}

.fbk-fab {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    color: var(--ui-text-muted);
    cursor: pointer;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal),
        color var(--transition-normal), border-color var(--transition-normal);
}

.fbk-fab:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--ui-text);
    border-color: var(--ui-border-strong);
}

.fbk-fab:active {
    transform: scale(0.94);
}

.fbk-fab:focus-visible {
    outline: none;
    box-shadow: var(--shadow-md), var(--ui-ring);
}

.fbk-fab svg {
    width: 22px;
    height: 22px;
}

.fbk-fab--loading {
    pointer-events: none;
}

.fbk-fab--loading svg {
    animation: fbk-spin 0.8s linear infinite;
}

@keyframes fbk-spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 767.98px) {
    .fbk-fabs {
        right: var(--space-4);
        bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
    }

    .fbk-fab {
        width: 46px;
        height: 46px;
    }
}

/* ------------------------------------------------------------
   2. 意见反馈 Modal
   ------------------------------------------------------------ */
.fbk-modal {
    display: none;
    background: rgba(24, 26, 30, 0.45);
}

.fbk-modal.is-open {
    display: flex;
}

.fbk-modal__panel {
    width: 100%;
    max-width: 640px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
}

.fbk-modal__head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-5) var(--space-6) var(--space-4);
}

.fbk-modal__eyebrow {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--ui-text-muted);
    margin: 0 0 var(--space-1);
}

.fbk-modal__title {
    margin: 0;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--ui-text);
    letter-spacing: -0.01em;
}

.fbk-modal__subtitle {
    margin: var(--space-1) 0 0;
    font-size: var(--font-size-sm);
    color: var(--ui-text-muted);
    line-height: 1.6;
}

.fbk-modal__close {
    flex: none;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: none;
    border: none;
    border-radius: var(--radius-md);
    color: var(--ui-text-muted);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.fbk-modal__close:hover {
    background: var(--ui-surface-subtle);
    color: var(--ui-text);
}

.fbk-modal__body {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    padding: 0 var(--space-6) var(--space-5);
    overflow-y: auto;
}

.fbk-modal__foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--ui-border);
    background: var(--ui-surface);
}

.fbk-note {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-tiny);
    color: var(--ui-text-muted);
    line-height: 1.5;
}

.fbk-note svg {
    flex: none;
    width: 14px;
    height: 14px;
}

@media (max-width: 767.98px) {
    .fbk-modal {
        padding: 0;
        align-items: flex-end;
    }

    .fbk-modal__panel {
        max-height: 92vh;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    }

    .fbk-modal__head,
    .fbk-modal__body,
    .fbk-modal__foot {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }

    .fbk-modal__foot {
        flex-direction: column-reverse;
        align-items: stretch;
    }
}

/* ------------------------------------------------------------
   3. 表单控件
   ------------------------------------------------------------ */
.fbk-field {
    display: flex;
    flex-direction: column;
}

.fbk-field__top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

.fbk-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--ui-text);
}

.fbk-label__hint {
    font-weight: var(--font-weight-normal);
    font-size: var(--font-size-xs);
    color: var(--ui-text-muted);
}

.fbk-required {
    color: var(--ui-danger);
}

.fbk-counter {
    font-size: var(--font-size-xs);
    color: var(--ui-text-muted);
}

/* 接近字数上限时用语义色提醒；项目里 warning 与 danger 同色 */
.fbk-counter--warn {
    color: var(--ui-danger);
    font-weight: var(--font-weight-medium);
}

.fbk-input,
.fbk-textarea {
    width: 100%;
    background: var(--ui-surface-subtle);
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    font-family: inherit;
    font-size: var(--font-size-sm);
    color: var(--ui-text);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
        background var(--transition-fast);
}

.fbk-textarea {
    resize: none;
    line-height: 1.7;
}

.fbk-input::placeholder,
.fbk-textarea::placeholder {
    color: var(--ui-text-muted);
}

.fbk-input:focus,
.fbk-textarea:focus {
    border-color: var(--ui-text);
    background: var(--ui-surface);
    box-shadow: var(--ui-ring);
}

/* 反馈类型：四张并排卡片 */
.fbk-types {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-2);
}

@media (max-width: 639.98px) {
    .fbk-types {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.fbk-type {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-2);
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-lg);
    color: var(--ui-text-muted);
    font-family: inherit;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: border-color var(--transition-fast), background var(--transition-fast),
        box-shadow var(--transition-fast), color var(--transition-fast);
}

.fbk-type svg {
    flex: none;
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.fbk-type:hover {
    border-color: var(--ui-border-strong);
    background: var(--ui-surface-subtle);
}

.fbk-type.is-active {
    border-color: var(--ui-text);
    background: var(--ui-surface-subtle);
    color: var(--ui-text);
    font-weight: var(--font-weight-semibold);
    box-shadow: 0 0 0 2px rgba(40, 42, 47, 0.1);
}

.fbk-type.is-active svg {
    transform: scale(1.1);
}

/* 截图上传 + 联系方式双列 */
.fbk-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-5);
}

@media (max-width: 639.98px) {
    .fbk-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

.fbk-col {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.fbk-dropzone {
    flex: 1;
    min-height: 104px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    padding: var(--space-4);
    background: var(--ui-surface-subtle);
    border: 2px dashed var(--ui-border);
    border-radius: var(--radius-lg);
    color: var(--ui-text-muted);
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-fast), background var(--transition-fast),
        color var(--transition-fast);
}

.fbk-dropzone:hover {
    border-color: var(--ui-text-muted);
    background: var(--ui-surface-selected);
}

.fbk-dropzone.is-drag {
    border-color: var(--ui-text);
    background: var(--ui-surface-selected);
    color: var(--ui-text);
}

.fbk-dropzone svg {
    width: 24px;
    height: 24px;
}

.fbk-dropzone__label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
}

.fbk-dropzone__hint {
    font-size: var(--font-size-tiny);
    color: var(--ui-text-muted);
}

.fbk-previews {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-2);
}

.fbk-previews:empty {
    display: none;
}

.fbk-preview {
    position: relative;
    width: 56px;
    height: 56px;
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-md);
    background: var(--ui-surface);
    overflow: hidden;
}

.fbk-preview img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.fbk-preview__remove {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: rgba(40, 42, 47, 0.65);
    border: none;
    border-radius: var(--radius-full);
    color: var(--ui-surface);
    font-size: var(--font-size-tiny);
    line-height: 1;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-fast), background var(--transition-fast);
}

.fbk-preview:hover .fbk-preview__remove,
.fbk-preview__remove:focus-visible {
    opacity: 1;
}

.fbk-preview__remove:hover {
    background: var(--ui-text);
}

/* 触摸设备没有 hover，删除按钮必须常驻可见 */
@media (hover: none) {
    .fbk-preview__remove {
        opacity: 1;
    }
}

.fbk-input-wrap {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
}

.fbk-input-wrap__icon {
    position: absolute;
    left: var(--space-3);
    display: flex;
    color: var(--ui-text-muted);
    pointer-events: none;
}

.fbk-input-wrap__icon svg {
    width: 16px;
    height: 16px;
}

.fbk-input--icon {
    padding-left: 40px;
}

.fbk-error {
    margin: var(--space-2) 0 0;
    font-size: var(--font-size-xs);
    color: var(--ui-danger);
    min-height: 1em;
}

.fbk-error:empty {
    display: none;
}

/* 主提交按钮 */
.fbk-submit {
    flex: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: 44px;
    padding: 0 var(--space-8);
    background: var(--ui-text);
    border: 1px solid var(--ui-text);
    border-radius: var(--radius-lg);
    color: var(--ui-surface);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.fbk-submit:hover:not(:disabled) {
    background: var(--primary-dark);
}

.fbk-submit:active:not(:disabled) {
    transform: scale(0.97);
}

.fbk-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.fbk-submit svg {
    width: 16px;
    height: 16px;
}

.fbk-submit--loading svg {
    animation: fbk-spin 0.8s linear infinite;
}

/* ------------------------------------------------------------
   4. 反馈详情页（移动端优先，在微信内置浏览器打开）
   ------------------------------------------------------------ */
.fbk-detail {
    min-height: 100vh;
    background: var(--ui-canvas);
    -webkit-font-smoothing: antialiased;
}

.fbk-detail__top {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    height: 56px;
    padding: 0 var(--space-4);
    background: rgba(252, 252, 253, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--ui-border);
}

.fbk-detail__back {
    flex: none;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: none;
    border: none;
    border-radius: var(--radius-full);
    color: var(--ui-text-secondary);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.fbk-detail__back:hover {
    background: var(--ui-surface-subtle);
}

.fbk-detail__title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--ui-text);
}

.fbk-detail__no {
    margin-left: auto;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: var(--font-size-tiny);
    color: var(--ui-text-muted);
}

.fbk-detail__main {
    max-width: 672px;
    margin: 0 auto;
    padding: var(--space-6) var(--space-4) 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.fbk-card {
    padding: var(--space-5);
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xs);
}

.fbk-card__title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin: 0 0 var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--ui-text);
}

.fbk-card__title svg {
    flex: none;
    width: 16px;
    height: 16px;
    color: var(--ui-text-muted);
}

.fbk-card__title-hint {
    font-weight: var(--font-weight-normal);
    font-size: var(--font-size-xs);
    color: var(--ui-text-muted);
}

.fbk-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.fbk-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 4px 10px;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
}

.fbk-badge svg {
    width: 14px;
    height: 14px;
}

.fbk-badge__dot {
    width: 6px;
    height: 6px;
    border-radius: var(--radius-full);
    background: currentColor;
}

.fbk-badge--bug {
    background: var(--ui-danger-soft);
    border-color: #fecaca;
    color: var(--ui-danger);
}

.fbk-badge--feature {
    background: var(--ui-success-soft);
    border-color: #bbf7d0;
    color: var(--ui-success);
}

.fbk-badge--ux,
.fbk-badge--other {
    background: var(--ui-surface-subtle);
    border-color: var(--ui-border);
    color: var(--ui-text-secondary);
}

.fbk-badge--done {
    background: var(--ui-success-soft);
    border-color: #bbf7d0;
    color: var(--ui-success);
}

.fbk-badge--pending {
    background: var(--ui-surface-subtle);
    border-color: var(--ui-border);
    color: var(--ui-text-muted);
}

.fbk-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-5);
    padding-top: var(--space-4);
    border-top: 1px solid var(--ui-border);
    font-size: var(--font-size-xs);
    color: var(--ui-text-muted);
}

.fbk-meta__item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.fbk-meta__item svg {
    width: 14px;
    height: 14px;
    color: var(--ui-text-muted);
}

.fbk-desc {
    font-size: var(--font-size-sm);
    line-height: 1.7;
    color: var(--ui-text-secondary);
    white-space: pre-wrap;
    word-break: break-word;
}

.fbk-shots {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
}

.fbk-shot {
    display: block;
    width: 100%;
    padding: 0;
    aspect-ratio: 16 / 9;
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-lg);
    background: var(--ui-surface-subtle);
    overflow: hidden;
    cursor: zoom-in;
}

.fbk-shot img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.fbk-shot:hover img {
    transform: scale(1.04);
}

.fbk-contact {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--ui-surface-subtle);
    border: 1px solid var(--ui-border);
    border-radius: var(--radius-md);
}

.fbk-contact__value {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: var(--font-size-sm);
    color: var(--ui-text);
    word-break: break-all;
}

.fbk-copy {
    flex: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    min-height: 32px;
    padding: 0 var(--space-2);
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--ui-text-muted);
    font-family: inherit;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.fbk-copy svg {
    width: 14px;
    height: 14px;
}

.fbk-copy:hover {
    color: var(--ui-text);
    background: var(--ui-surface-selected);
}

.fbk-copy.is-copied {
    color: var(--ui-success);
}

.fbk-detail__foot {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-4) var(--space-10);
    font-size: var(--font-size-xs);
    color: var(--ui-text-muted);
}

.fbk-detail__foot svg {
    width: 14px;
    height: 14px;
}

/* 图片放大 */
.fbk-lightbox {
    position: fixed;
    inset: 0;
    z-index: var(--z-popover);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    background: rgba(24, 26, 30, 0.9);
    cursor: zoom-out;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.fbk-lightbox.is-open {
    opacity: 1;
    pointer-events: auto;
}

.fbk-lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    transform: scale(0.94);
    transition: transform var(--transition-normal);
}

.fbk-lightbox.is-open img {
    transform: scale(1);
}

.fbk-lightbox__close {
    position: absolute;
    top: var(--space-6);
    right: var(--space-6);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: rgba(252, 252, 253, 0.12);
    border: none;
    border-radius: var(--radius-full);
    color: var(--ui-surface);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.fbk-lightbox__close:hover {
    background: rgba(252, 252, 253, 0.24);
}

/* ------------------------------------------------------------
   5. 无障碍与降级
   ------------------------------------------------------------ */
.fbk-visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (prefers-reduced-motion: reduce) {
    .fbk-fab,
    .fbk-fabs,
    .fbk-fab--loading svg,
    .fbk-submit--loading svg,
    .fbk-shot img,
    .fbk-lightbox,
    .fbk-lightbox img {
        transition: none;
        animation: none;
        transform: none;
    }
}