/* ==========================================
   4. 配置项 & 表单
   ========================================== */
.wb-field-group { margin-bottom: 22px; }
.wb-field-group label { display: block; font-size: var(--font-xs); font-weight: 500; color: var(--text-grey); margin: 0 0 8px 12px; }
#settings-modal .wb-field-group label { margin-left: 0; }

.wb-field-label-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.wb-field-label-row label {
    margin-bottom: 0;
}

.wb-field-label-row .wb-btn--view {
    margin-right: 12px;
}

.wb-field-input {
    width: 100%; height: var(--field-h); padding: 0 16px;
    background: var(--field-bg); border: none; outline: none; box-shadow: none;
    border-radius: var(--radius-base); font-size: var(--font-base); color: var(--text-main); transition: background 0.3s ease, box-shadow 0.3s ease, color 0.3s ease; cursor: text;
    backdrop-filter: blur(16px) saturate(150%);
    -webkit-backdrop-filter: blur(16px) saturate(150%);
}

#studentNameInput.wb-field-input {
    height: var(--field-h-compact);
    padding: 0 12px;
    font-size: var(--font-xs);
    font-weight: 400;
}

.wb-field-input::placeholder {
    font-size: var(--font-xs);
    font-weight: 400;
    color: var(--text-grey);
    opacity: 0.9;
}

.wb-field-input:hover, .wb-field-input:focus { 
    background: var(--field-bg-active); 
    box-shadow: 0 0 0 2px var(--vitality-blue) !important; 
}

[data-theme="dark"] .wb-field-input:hover,
[data-theme="dark"] .wb-field-input:focus {
    background: var(--field-bg-active);
    box-shadow: 0 0 0 2px var(--vitality-blue) !important;
}

select.wb-field-input {
    appearance: none; -webkit-appearance: none;
    font-size: var(--font-xs);
    font-weight: 400;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat; background-position: right 14px center; background-size: 16px;
    padding-right: 40px; cursor: pointer; border: none;
}
[data-theme="dark"] select.wb-field-input {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f7' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
}

.wb-seg { display: flex; gap: 10px; height: var(--field-h); }
.wb-seg-option {
    flex: 1; display: flex; justify-content: center; align-items: center;
    background: var(--input-bg); border: none; outline: none; box-shadow: none;
    border-radius: var(--radius-base); font-size: var(--font-base); color: var(--text-grey);
    cursor: pointer; transition: background 0.3s ease, color 0.3s ease, opacity 0.3s ease, transform 0.3s ease; font-weight: 600; user-select: none;
}
.wb-seg-option.active {
    background: var(--btn-aqua-bg); color: var(--btn-aqua-text);
    box-shadow: none; backdrop-filter: blur(10px);
}

/* 🌟 新增防呆锁定状态 */
.wb-seg.disabled {
    opacity: 0.5;
    pointer-events: none;
    cursor: not-allowed;
    filter: grayscale(80%);
}

.wb-field-inline { position: relative; display: flex; align-items: center; width: 100%; }
.wb-field-inline .wb-field-input { padding-right: 70px; }
.wb-btn--inline-confirm {
    position: absolute; right: 6px; height: var(--field-h-compact); padding: 0 16px; z-index: 10;
    background: var(--text-main); color: var(--bg-center); border: none; outline: none;
    border-radius: var(--radius-base); font-size: var(--font-sm); font-weight: 600;
    cursor: pointer; transition: all 0.3s ease;
    opacity: 0; pointer-events: none; transform: translateX(5px);
}
.wb-btn--inline-confirm.show { opacity: 1; pointer-events: auto; transform: translateX(0); }
.wb-btn--inline-confirm:hover { opacity: 0.8; transform: translateX(0) scale(0.98); }

.wb-btn--confirm-small {
    padding: 0 16px; background: var(--text-main); color: var(--bg-center);
    border: none; outline: none; border-radius: var(--radius-base); font-weight: 600; font-size: var(--font-md);
    cursor: pointer; transition: 0.3s; white-space: nowrap; height: var(--field-h);
}
.wb-btn--confirm-small:hover { opacity: 0.8; transform: translateY(-1px); }

.wb-modal-secure-otp { display: flex; animation: slideDownFade 0.3s ease forwards; }
@keyframes slideDownFade { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }

.wb-account-delete-link { font-size: var(--font-md); color: var(--text-grey); text-decoration: underline; text-underline-offset: 4px; cursor: pointer; transition: color 0.3s; }
.wb-account-delete-link:hover { color: var(--btn-danger); }

.wb-modal-select-row { display: flex; gap: 10px; align-items: flex-start; }
.wb-select { flex: 1; user-select: none; display: flex; flex-direction: column; position: relative; }
.wb-select.open { z-index: 10; }

.wb-select-display {
    width: 100%; height: var(--field-h-compact); padding: 0 12px; 
    background: var(--field-bg); border: none; outline: none; box-shadow: none !important;
    border-radius: var(--radius-base); font-size: var(--font-xs); font-weight: 400; color: var(--text-main); cursor: pointer; 
    display: flex; justify-content: space-between; align-items: center; transition: background 0.3s ease, box-shadow 0.3s ease, color 0.3s ease; 
}
.wb-select-display:hover, .wb-select.open .wb-select-display { 
    background: var(--field-bg-active);
    box-shadow: 0 0 0 2px var(--vitality-blue) !important; 
    border-color: var(--vitality-blue);
}

[data-theme="dark"] .wb-select-display:hover,
[data-theme="dark"] .wb-select.open .wb-select-display {
    background: var(--field-bg-active);
    box-shadow: 0 0 0 2px var(--vitality-blue) !important;
    border-color: transparent;
}

.wb-select-arrow { transition: transform 0.3s; stroke: var(--text-grey); }
.wb-select.open .wb-select-arrow { transform: rotate(180deg); }

.wb-select-options { 
    display: block; max-height: 0; overflow: hidden; opacity: 0; margin-top: 0; padding: 0 6px; 
    background: var(--select-popover-bg); backdrop-filter: blur(35px); -webkit-backdrop-filter: blur(35px); 
    border-radius: var(--radius-base); border: none; outline: none;
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1); list-style: none; 
    position: relative; 
    top: 0; left: 0; right: 0; 
    box-shadow: none; 
    pointer-events: none; z-index: 5;
}
.wb-select-options::-webkit-scrollbar { display: none; }
.wb-select.open .wb-select-options { max-height: 250px; opacity: 1; margin-top: 8px; padding: 6px; pointer-events: auto; overflow-y: auto;}
.wb-select-options li { padding: 12px 14px; font-size: var(--font-xs); color: var(--text-main); font-weight: 400; border-radius: var(--radius-base); cursor: pointer; transition: 0.2s; }
.wb-select-options li:hover {
    background: var(--accent-soft-bg-strong);
    color: var(--vitality-blue);
}
/* 科目可见性开关·禁用项灰显（管理端 subject_visibility 关闭的科目） */
.wb-select-options li.is-disabled {
    color: var(--text-tertiary, #b0b0b0);
    cursor: not-allowed;
    opacity: 0.55;
}
.wb-select-options li.is-disabled:hover {
    background: transparent;
    color: var(--text-tertiary, #b0b0b0);
}

#paperSelectWrapper .wb-select-options li { padding: 8px 12px; }
#paperSelectWrapper .wb-select-display {
    min-width: 0;
}
#paperSelectText {
    display: block;
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
#paperSelectWrapper .wb-select-arrow {
    flex: 0 0 auto;
    margin-left: 8px;
}
.paper-select-hint { font-size: 9px; color: rgba(142,142,147,0.6); margin-top: 8px; font-weight: 400; text-align: center; }
.paper-option-empty { color: var(--text-grey) !important; cursor: default !important; font-style: italic; pointer-events: none; }
.paper-option-cancel { color: var(--text-grey) !important; }
.paper-option-missing { color: var(--text-grey) !important; cursor: not-allowed !important; opacity: 0.62; }
.paper-option-missing:hover { background: transparent !important; color: var(--text-grey) !important; }

.wb-btn--view { padding: 0; height: auto; border: none; outline: none; background: transparent; font-size: var(--font-xs); font-weight: 500; color: var(--vitality-blue); text-decoration: none; cursor: pointer; transition: opacity 0.2s ease, color 0.2s ease; white-space: nowrap; margin-left: 0; }
.wb-btn--view:disabled { color: rgba(150,150,150,0.5); text-decoration: none; cursor: not-allowed; }

.wb-modal-subject-grid {
    display: flex;
    gap: 4px;
    margin-top: 6px;
    padding: 4px;
    background: var(--bg-page);
    border-radius: var(--radius-base);
    box-shadow: none;
}
.subject-card {
    flex: 1;
    min-height: 32px;
    padding: 7px 10px;
    background: transparent;
    border: none;
    outline: none;
    box-shadow: none;
    border-radius: calc(var(--radius-base) - 3px);
    text-align: center;
    font-size: var(--font-xs);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
    color: var(--text-grey);
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: 0.01em;
}
.subject-card:hover {
    transform: none;
    box-shadow: none;
    background: var(--accent-soft-bg);
}
.subject-card:active { transform: none; }

.subject-card.active { 
    background: var(--accent-soft-bg) !important;
    color: var(--vitality-blue) !important;
    backdrop-filter: none; -webkit-backdrop-filter: none;
    box-shadow: none !important;
}

[data-theme="dark"] .wb-modal-subject-grid {
    background: var(--bg-page);
    box-shadow: none;
}

[data-theme="dark"] .subject-card:hover {
    background: var(--accent-soft-bg);
}

[data-theme="dark"] .subject-card.active {
    background: var(--accent-soft-bg-strong) !important;
    color: #f5f5f7 !important;
    box-shadow: none !important;
}

:root:not([data-theme="dark"]) .wb-modal-subject-grid {
    background: var(--bg-page);
    box-shadow: none;
}

:root:not([data-theme="dark"]) .subject-card {
    color: rgba(60, 60, 67, 0.72);
}

:root:not([data-theme="dark"]) .subject-card:hover {
    background: var(--accent-soft-bg);
}

:root:not([data-theme="dark"]) .subject-card.active {
    background: rgba(94, 106, 210, 0.12) !important;
    color: var(--vitality-blue) !important;
    box-shadow: none !important;
}

.wb-modal-generate-stack {
    width: 100%;
    margin-top: 15px;
    position: relative;
    background: rgba(34, 36, 40, 0);
    border-radius: var(--radius-base);
    overflow: visible;
    transition: background-color 0.28s ease, border-radius 0.28s ease;
}

.wb-modal-generate-stack.manual-open {
    background: var(--glass-panel-bg);
    border-radius: var(--radius-base);
    box-shadow: none;
    overflow: hidden;
}

.wb-btn--generate {
    width: 100%; margin-top: 0; padding: 14px;
    background: var(--btn-aqua-bg); color: var(--btn-aqua-text);
    border-radius: var(--radius-base); font-weight: 500; font-size: var(--font-sm); border: none; outline: none;
    cursor: pointer; transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, color 0.18s ease, opacity 0.18s ease;
    backdrop-filter: none; -webkit-backdrop-filter: none;
    box-shadow: none;
    position: relative;
    z-index: 2;
}
.wb-btn--generate:hover {
    transform: translateY(-1px);
    background: var(--btn-aqua-hover);
    box-shadow: none;
}
.wb-btn--generate:active {
    transform: translateY(0) scale(0.992);
    background: var(--btn-aqua-hover);
    box-shadow: none;
}

:root:not([data-theme="dark"]) .wb-aside .wb-field-input,
:root:not([data-theme="dark"]) .wb-aside .wb-select-display {
    background-color: var(--field-bg-panel);
}

:root:not([data-theme="dark"]) .wb-aside .wb-field-input:hover,
:root:not([data-theme="dark"]) .wb-aside .wb-field-input:focus,
:root:not([data-theme="dark"]) .wb-aside .wb-select-display:hover,
:root:not([data-theme="dark"]) .wb-aside .wb-select.open .wb-select-display {
    background-color: var(--field-bg-panel-active);
}

[data-theme="dark"] .wb-aside .wb-field-input,
[data-theme="dark"] .wb-aside .wb-select-display {
    background-color: var(--field-bg);
}

[data-theme="dark"] .wb-aside .wb-field-input:hover,
[data-theme="dark"] .wb-aside .wb-field-input:focus,
[data-theme="dark"] .wb-aside .wb-select-display:hover,
[data-theme="dark"] .wb-aside .wb-select.open .wb-select-display {
    background-color: var(--field-bg-active);
}

[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] input[type="search"],
[data-theme="dark"] input[type="tel"],
[data-theme="dark"] input[type="url"],
[data-theme="dark"] input[type="number"],
[data-theme="dark"] select,
[data-theme="dark"] textarea,
[data-theme="dark"] .wb-field-input,
[data-theme="dark"] .wb-select-display,
[data-theme="dark"] .wb-select-options,
[data-theme="dark"] .wb-downloads-list-search {
    background-color: var(--field-bg);
}

[data-theme="dark"] input[type="text"]:hover,
[data-theme="dark"] input[type="text"]:focus,
[data-theme="dark"] input[type="password"]:hover,
[data-theme="dark"] input[type="password"]:focus,
[data-theme="dark"] input[type="email"]:hover,
[data-theme="dark"] input[type="email"]:focus,
[data-theme="dark"] input[type="search"]:hover,
[data-theme="dark"] input[type="search"]:focus,
[data-theme="dark"] input[type="tel"]:hover,
[data-theme="dark"] input[type="tel"]:focus,
[data-theme="dark"] input[type="url"]:hover,
[data-theme="dark"] input[type="url"]:focus,
[data-theme="dark"] input[type="number"]:hover,
[data-theme="dark"] input[type="number"]:focus,
[data-theme="dark"] select:hover,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:hover,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] .wb-field-input:hover,
[data-theme="dark"] .wb-field-input:focus,
[data-theme="dark"] .wb-select-display:hover,
[data-theme="dark"] .wb-select.open .wb-select-display,
[data-theme="dark"] .wb-downloads-list-search:hover,
[data-theme="dark"] .wb-downloads-list-search:focus-within {
    background-color: var(--field-bg-active);
}

[data-theme="dark"] .wb-downloads-list-search input,
[data-theme="dark"] .wb-downloads-list-search input:hover,
[data-theme="dark"] .wb-downloads-list-search input:focus {
    background: transparent;
}

.wb-btn--generate.abort {
    background: var(--btn-danger);
    color: #ffffff;
    border-color: transparent;
    box-shadow: none;
}

.wb-btn--generate.abort:hover {
    background: var(--btn-danger-hover);
    color: #ffffff;
    box-shadow: none;
}

.wb-btn--generate.abort:active {
    background: var(--btn-danger-hover);
    color: #ffffff;
    box-shadow: none;
}

.wb-btn--generate.cooldown { background: rgba(120, 120, 120, 0.15); color: rgba(150, 150, 150, 0.6); box-shadow: none; cursor: not-allowed; pointer-events: none; }
.wb-btn--generate.detecting {
    background: rgba(120, 120, 120, 0.18);
    color: rgba(110, 110, 115, 0.9);
    cursor: not-allowed;
    pointer-events: none;
    filter: none;
}
.wb-btn--generate.detecting:hover,
.wb-btn--generate.detecting:active {
    transform: none;
    box-shadow: none;
}

.wb-btn--generate.not-ready,
.wb-btn--generate:disabled:not(.abort):not(.cooldown):not(.detecting) {
    background: rgba(120, 120, 120, 0.16);
    color: rgba(120, 120, 120, 0.75);
    cursor: not-allowed;
    pointer-events: none;
    transform: none;
    box-shadow: none;
    filter: none;
}

.wb-modal-generate-stack.manual-open .wb-btn--generate {
    background: transparent;
    color: var(--text-main);
    border-radius: var(--radius-base) var(--radius-base) 0 0;
    box-shadow: none;
}

:root:not([data-theme="dark"]) .wb-modal-generate-stack.manual-open .wb-btn--generate {
    color: rgba(28, 28, 30, 0.82);
}

[data-theme="dark"] .wb-modal-generate-stack.manual-open .wb-btn--generate {
    color: rgba(245, 245, 247, 0.88);
}

.wb-modal-generate-stack.manual-open .wb-btn--generate:hover,
.wb-modal-generate-stack.manual-open .wb-btn--generate:active {
    transform: none;
    box-shadow: none;
}

.wb-modal-generate-stack.manual-open .wb-btn--generate.detecting {
    background: transparent;
    color: inherit;
    box-shadow: none;
}

:root:not([data-theme="dark"]) .wb-modal-generate-stack.manual-open .wb-btn--generate.detecting {
    color: rgba(60, 60, 67, 0.7);
}

[data-theme="dark"] .wb-modal-generate-stack.manual-open .wb-btn--generate.detecting {
    color: var(--text-grey);
}

.wb-modal-generate-stack.manual-open .wb-btn--generate.abort {
    background: var(--btn-danger);
    color: #ffffff;
}

.wb-modal-generate-stack.manual-open .wb-btn--generate.abort:hover,
.wb-modal-generate-stack.manual-open .wb-btn--generate.abort:active {
    background: var(--btn-danger-hover);
    color: #ffffff;
}

.wb-modal-exam-panel {
    --manual-choice-ease: cubic-bezier(0.22, 1, 0.36, 1);
    margin-top: 0;
    padding: 0 10px;
    background: transparent;
    border: none;
    border-radius: 0;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    position: relative;
    z-index: 1;
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition:
        max-height 0.28s var(--manual-choice-ease),
        opacity 0.22s ease,
        transform 0.28s var(--manual-choice-ease),
        padding 0.28s var(--manual-choice-ease);
}

.wb-modal-exam-panel.visible {
    max-height: 96px;
    opacity: 1;
    transform: translateY(0);
    padding: 8px 10px 10px;
    pointer-events: auto;
}

.wb-modal-exam-panel.closing {
    pointer-events: none;
}

.wb-modal-exam-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    transform-origin: center top;
    transition: transform 0.2s var(--manual-choice-ease), opacity 0.16s ease, filter 0.2s var(--manual-choice-ease);
}

.wb-modal-exam-panel.step-transitioning .wb-modal-exam-grid {
    pointer-events: none;
}

.wb-modal-exam-panel.step-transition-out .wb-modal-exam-grid {
    transform: scale(0.986) translateY(-1px);
    opacity: 0.52;
    filter: saturate(0.92);
}

.wb-modal-exam-panel.step-transition-in .wb-modal-exam-grid {
    animation: manualChoiceStepIn 0.22s var(--manual-choice-ease);
}

@keyframes manualChoiceStepIn {
    from {
        transform: scale(0.992) translateY(4px);
        opacity: 0.4;
        filter: saturate(0.94);
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
        filter: none;
    }
}

.wb-modal-exam-choice {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 0 8px;
    background: var(--btn-aqua-bg);
    border: none;
    border-radius: var(--radius-base);
    color: #ffffff;
    box-shadow: none;
    cursor: pointer;
    transition: transform 0.2s var(--manual-choice-ease), background-color 0.22s var(--manual-choice-ease), opacity 0.2s ease, filter 0.2s ease, color 0.2s ease;
}

.wb-modal-exam-choice:hover {
    transform: translateY(-1px);
    background: var(--btn-aqua-hover);
    box-shadow: none;
}

.wb-modal-exam-choice:active {
    transform: scale(0.98);
}

.wb-modal-exam-choice:disabled {
    cursor: default;
    pointer-events: none;
}

.wb-modal-exam-choice.recommended {
    box-shadow: none;
}

.wb-modal-exam-choice.answer-key {
    background: var(--vitality-green);
}

.wb-modal-exam-choice.answer-key:hover {
    background: var(--vitality-green-hover);
}

.wb-modal-exam-choice__label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 1em;
    font-size: var(--font-xs);
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: opacity 0.12s ease, transform 0.18s var(--manual-choice-ease), letter-spacing 0.18s var(--manual-choice-ease);
}

.wb-modal-exam-choice__label.label-exit {
    opacity: 0;
    transform: translateY(-5px) scale(0.986);
    letter-spacing: 0.04em;
}

.wb-modal-exam-choice__label.label-enter {
    opacity: 0;
    transform: translateY(5px) scale(0.992);
    letter-spacing: 0.02em;
}

.wb-modal-exam-choice__label.label-enter.label-enter-active {
    opacity: 1;
    transform: translateY(0) scale(1);
    letter-spacing: 0.01em;
}

.wb-btn--center-short { 
    display: block; width: 180px; margin: 0 auto; padding: 14px; 
    background: var(--btn-aqua-bg); color: var(--btn-aqua-text); border: none; outline: none; border-radius: var(--radius-base); 
    font-weight: 700; cursor: pointer; transition: 0.3s; text-align: center; font-size: var(--font-base); 
    box-shadow: none; backdrop-filter: none;
}
.wb-btn--center-short:hover {
    background: var(--btn-aqua-hover);
    transform: translateY(-2px);
}

/* ==========================================
   5. 文件列表管理系统
   ========================================== */
#file-list-container {
    display: none;
    margin-top: 18px;
    padding: 0;
    background: transparent;
    box-shadow: none;
    border: none;
    outline: none;
    animation: fadeIn 0.3s ease;
}
@keyframes fadeIn { from{ opacity:0; transform:translateY(-5px); } to{ opacity:1; transform:translateY(0); } }

.wb-downloads-file-list__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    padding-left: 0;
}
.wb-downloads-file-list__title { font-size: var(--font-xs); font-weight: 500; color: var(--text-grey); }
.file-list-content,
#file-list-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}
.wb-btn--clear-all { background: none; border: none; outline: none; color: var(--btn-danger); font-size: var(--font-sm); font-weight: 600; cursor: pointer; transition: 0.2s; }
.wb-btn--clear-all:hover { opacity: 0.7; }
.file-item {
    display: block;
    width: 100%;
    min-height: 38px;
    padding: 7px 0;
    margin-bottom: 0;
    background: transparent;
    border-radius: var(--radius-base);
    border: none;
    outline: none;
    box-shadow: none;
    transition: transform 0.25s ease;
}
.file-item-stack {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr) 18px;
    grid-template-areas:
        "tag name delete"
        ". note .";
    column-gap: 8px;
    row-gap: 2px;
    width: 100%;
    min-width: 0;
}
.file-item-row {
    display: contents;
}
.file-tag-slot {
    grid-area: tag;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 42px;
    width: 42px;
    min-height: 18px;
}
.file-tag-group {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.file-item-main {
    grid-area: name;
    display: flex;
    align-items: center;
    min-width: 0;
}
.file-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    min-height: 15px;
    font-size: 9px;
    padding: 0 5px;
    border-radius: 999px;
    font-weight: 700;
    line-height: 15px;
    white-space: nowrap;
    text-align: center;
    box-sizing: border-box;
    border: none;
    letter-spacing: 0.01em;
    box-shadow: none;
}
.tag-paper,
.tag-paper-template,
.tag-paper-mock {
    background: rgba(0, 100, 210, 0.12);
    color: var(--vitality-blue);
}
.tag-paper-module {
    background: rgba(134, 184, 23, 0.16);
    color: #5F850F;
}
.tag-answer-key { background: var(--success-soft-bg); color: var(--success-ink); }
.tag-answer { background: var(--warning-soft-bg); color: var(--warning-ink); }

[data-theme="dark"] .tag-paper,
[data-theme="dark"] .tag-paper-template,
[data-theme="dark"] .tag-paper-mock {
    background: rgba(0, 100, 210, 0.24);
    color: #6EA8FF;
}

[data-theme="dark"] .tag-paper-module {
    background: rgba(134, 184, 23, 0.2);
    color: #B6E24C;
}

.file-item-name {
    display: inline-flex;
    align-items: center;
    height: 18px;
    font-size: var(--font-sm);
    line-height: 18px;
    color: var(--text-main);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    flex: 1 1 auto;
}
.file-item-name-button {
    display: inline-flex;
    align-items: center;
    width: 100%;
    height: 18px;
    padding: 0;
    margin: 0;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    cursor: pointer;
    text-align: left;
    min-width: 0;
    appearance: none;
    -webkit-appearance: none;
}
.file-item-name-track {
    position: relative;
    display: block;
    width: 100%;
    height: 18px;
    min-width: 0;
    overflow: hidden;
}
.file-item-name-text,
.file-item-name-edit {
    position: absolute;
    inset: 0;
    display: block;
    width: 100%;
    height: 18px;
    font-size: var(--font-sm);
    line-height: 18px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition:
        transform 0.34s cubic-bezier(0.22, 1, 0.36, 1),
        opacity 0.24s ease,
        color 0.22s ease,
        letter-spacing 0.22s ease;
}
.file-item-name-text {
    color: var(--text-main);
    transform: translateY(0);
    opacity: 1;
}
.file-item-name-edit {
    color: var(--vitality-blue);
    font-weight: 600;
    letter-spacing: 0.01em;
    transform: translateY(110%);
    opacity: 0;
}
.file-item-name-button:hover .file-item-name-text,
.file-item-name-button:focus-visible .file-item-name-text,
.file-item-name-button.is-open .file-item-name-text {
    transform: translateY(-110%);
    opacity: 0;
    letter-spacing: 0.015em;
}
.file-item-name-button:hover .file-item-name-edit,
.file-item-name-button:focus-visible .file-item-name-edit,
.file-item-name-button.is-open .file-item-name-edit {
    transform: translateY(0);
    opacity: 1;
}
.file-item-name-button:focus-visible {
    outline: none;
}
.file-item-notes {
    grid-area: note;
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}
.file-item-note {
    font-size: 11px;
    line-height: 1.15;
    color: var(--text-grey);
    opacity: 0.88;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    max-width: 100%;
}
.file-tag-status {
    width: 18px;
    height: 18px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
}
.file-tag-status.loading {
    background: var(--accent-soft-bg);
    color: var(--vitality-blue);
}
.file-tag-status.success {
    background: var(--vitality-green);
    color: #fff;
    animation: fileItemStatusPop 0.24s ease-out;
}
.file-tag-status.success svg {
    width: 11px;
    height: 11px;
}
.file-item-status {
    width: 18px;
    height: 18px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
}
.file-item-status.loading {
    background: var(--accent-soft-bg);
    color: var(--vitality-blue);
}
.file-item-spinner {
    width: 10px;
    height: 10px;
    border: 2px solid var(--accent-soft-border);
    border-top-color: var(--vitality-blue);
    border-radius: 50%;
    animation: fileItemSpin 0.8s linear infinite;
}
.file-item-status.success {
    background: var(--vitality-green);
    color: #fff;
    animation: fileItemStatusPop 0.24s ease-out;
}
.file-item-status.success svg {
    width: 11px;
    height: 11px;
}
.btn-delete-file {
    grid-area: delete;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    line-height: 18px;
    background: none;
    border: none;
    outline: none;
    color: var(--btn-danger);
    font-size: 16px;
    cursor: pointer;
    padding: 0;
    transition: 0.2s;
    margin-left: 0;
}
.btn-delete-file:hover { opacity: 0.6; }

@keyframes fileItemSpin {
    to { transform: rotate(360deg); }
}

@keyframes fileItemStatusPop {
    0% { transform: scale(0.75); opacity: 0.2; }
    100% { transform: scale(1); opacity: 1; }
}

@media (max-width: 640px) {
    .wb-modal-exam-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   6. 显示模式切换图标
   ========================================== */
.theme-toggle-icon-btn { 
    padding: 0; 
    display: flex; align-items: center; justify-content: center; 
    background: transparent !important;
    border: none;
    border-radius: 999px;
    cursor: pointer; transition: 0.3s; color: var(--text-grey); 
    width: var(--field-h-compact); height: var(--field-h-compact); align-self: flex-start;
}
.theme-toggle-icon-btn:hover { background: var(--accent-soft-bg); color: var(--vitality-blue); }
.header-theme-toggle { align-self: auto; }

.sun-icon { display: none; width: 17px; height: 17px; }
.moon-icon { display: block; width: 17px; height: 17px; }

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }

/* v2: upload-zone 固定 fixed 在底部.
   - left 永远不动 (跟 sidebar+aside 同步, 跟 drawer 无关)
   - right 跟随 drawer 开/关收缩 (drawer 开 → 右边界向左移, 宽度缩小, 跟主区视觉一致)
   - 跟主区的区别: 不在 wb-shell flex 里, 不被 padding-right 拉扯产生不必要的 transition */
#upload-zone {
    position: fixed;
    bottom: var(--frame-content-offset);
    left: calc(var(--sidebar-rail-shell-w) + var(--sidebar-panel-w) + var(--layout-gap) * 2);
    right: var(--frame-content-offset);
    /* 超宽屏封顶 + 居中: 上传区不再撑满工作区(那样会拉得过宽/空旷), 封顶到舒适宽度,
       多出来的宽度靠 margin auto 自动分到两侧当留白; 跟正上方居中的球对齐成一根居中列。 */
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    height: var(--upload-zone-h);
    display: flex;
    gap: var(--surface-gap);
    z-index: var(--z-content);
    transition: right var(--anim-drawer-d) var(--ease-apple),
                gap var(--anim-drawer-d) var(--ease-apple),
                transform 0.45s var(--ease-apple),
                opacity 0.32s ease;
}
body.wb-drawer-open #upload-zone {
    right: calc(var(--drawer-w) + var(--frame-content-offset) + var(--layout-gap));
}
#upload-zone:has(.wb-upload-card.is-paper-hidden) { gap: 0; }
.wb-answer-shell {
    flex: 1;
    min-width: 0;
    height: 100%;
    position: relative;
}
.wb-answer-shell .wb-upload-card {
    height: 100%;
}
.wb-upload-card {
    flex: 1; position: relative;
    /* v2: dashed 边框 + 透明 bg, 上传区不再用玻璃实色面板 */
    background: transparent;
    border: 1.5px dashed var(--divider);
    border-radius: var(--radius-base);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    transition: flex 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s ease, transform 0.2s ease, border-color 0.2s ease;
    cursor: pointer; overflow: hidden;
}
.wb-upload-card.is-paper-hidden { flex: 0; opacity: 0; border-width: 0; padding: 0; pointer-events: none; overflow: hidden; }
.wb-upload-card.is-manual-mode {
    align-items: stretch;
    justify-content: stretch;
    cursor: text;
    padding: 0;
}

.wb-upload-card.is-dragover { border-color: var(--vitality-blue); }
.wb-upload-card:hover { border-color: var(--vitality-blue); transform: translateY(-1px); }
.wb-upload-card.is-manual-mode:hover {
    transform: none;
    border-color: var(--input-border);
    box-shadow: none;
}

/* hover/dragover 只让虚线边框变蓝 (见上方 .wb-upload-card:hover / .is-dragover),
   不再叠加 inset 实线环 —— 之前实线环 + 虚线 = 双边框, 去掉实线那条。 */
:root:not([data-theme="dark"]) .wb-upload-card.is-manual-mode:hover {
    border-color: var(--upload-border);
    box-shadow: none;
}

.wb-upload-card h3 { font-size: var(--font-md); font-weight: 500; margin-bottom: 8px; color: var(--text-grey); pointer-events: none; transition: color 0.3s; }
.wb-upload-card p { font-size: var(--font-xs); font-weight: 400; color: var(--text-grey); opacity: 0.7; pointer-events: none; transition: color 0.3s; }
.wb-upload-card.is-dragover h3, .wb-upload-card.is-has-file h3 { color: var(--vitality-blue); }
.wb-file-input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; z-index: -1; }
.wb-answer-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 18px;
}
.wb-answer-placeholder[hidden],
.wb-upload-card-action[hidden] {
    display: none !important;
}
.wb-upload-card-action {
    position: absolute;
    right: 12px;
    bottom: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 30px;
    height: 30px;
    border-radius: 999px;
    border: 1px solid var(--input-border);
    background: var(--glass-panel-bg);
    color: var(--text-grey);
    font-size: var(--font-xs);
    font-weight: 600;
    cursor: pointer;
    z-index: 4;
    transition:
        width 0.42s cubic-bezier(0.22, 1, 0.36, 1),
        padding 0.42s cubic-bezier(0.22, 1, 0.36, 1),
        gap 0.42s cubic-bezier(0.22, 1, 0.36, 1),
        border-color 0.24s ease,
        background 0.24s ease,
        color 0.24s ease,
        opacity 0.24s ease,
        transform 0.32s cubic-bezier(0.22, 1, 0.36, 1);
}
[data-theme="dark"] .wb-upload-card-action {
    background: transparent;
}
.wb-upload-card-action {
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}
.wb-upload-card-action svg {
    width: 12px;
    height: 12px;
    flex: 0 0 12px;
}
.wb-upload-card-action-label {
    max-width: 0;
    opacity: 0;
    overflow: hidden;
    white-space: nowrap;
    transform: translateX(-8px);
    transition:
        max-width 0.42s cubic-bezier(0.22, 1, 0.36, 1),
        opacity 0.24s ease,
        transform 0.32s cubic-bezier(0.22, 1, 0.36, 1);
}
.wb-upload-card-action--expand {
    width: 32px;
    padding: 0 9px;
    gap: 0;
    overflow: hidden;
}
.wb-answer-shell:not(.is-manual-mode) .wb-upload-card-action--expand:hover,
.wb-answer-shell:not(.is-manual-mode) .wb-upload-card-action--expand:focus-visible {
    width: 94px;
    padding: 0 12px 0 10px;
    gap: 6px;
    color: var(--vitality-blue);
    transform: none;
    background: transparent;
    border-color: rgba(56, 163, 255, 0.34);
}
.wb-answer-shell:not(.is-manual-mode) .wb-upload-card-action--expand:hover .wb-upload-card-action-label,
.wb-answer-shell:not(.is-manual-mode) .wb-upload-card-action--expand:focus-visible .wb-upload-card-action-label {
    max-width: 48px;
    opacity: 1;
    transform: translateX(0);
}
.wb-answer-shell.is-manual-mode .wb-upload-card-action--expand {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.96);
}
.wb-upload-card-action--switch {
    width: 32px;
    padding: 0 9px;
    gap: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transform: scale(0.96);
}
.wb-answer-shell.is-manual-mode .wb-upload-card-action--switch {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
}
.wb-upload-card-action--switch:hover,
.wb-upload-card-action--switch:focus-visible {
    width: 94px;
    padding: 0 12px 0 10px;
    gap: 6px;
    color: var(--vitality-blue);
    background: transparent;
    border-color: rgba(56, 163, 255, 0.34);
    transform: scale(1);
}
.wb-upload-card-action--switch:hover .wb-upload-card-action-label,
.wb-upload-card-action--switch:focus-visible .wb-upload-card-action-label {
    max-width: 48px;
    opacity: 1;
    transform: translateX(0);
}
.wb-manual-panel {
    width: 100%;
    flex: 1 1 auto;
    display: flex;
    align-items: stretch;
    height: 100%;
    margin-top: 0;
    position: relative;
    z-index: 1;
}
.wb-manual-panel[hidden] {
    display: none !important;
}
.wb-manual-textarea {
    width: 100%;
    min-height: 100%;
    height: 100%;
    resize: none;
    border-radius: inherit;
    border: none;
    background: transparent;
    color: var(--text-main);
    font-size: 12px;
    line-height: 1.55;
    padding: 18px 18px 52px;
    outline: none;
    transition: color 0.2s ease, background 0.2s ease;
}
.wb-manual-textarea::placeholder {
    color: var(--text-grey);
    opacity: 0.72;
}
.wb-manual-textarea:focus {
    box-shadow: none;
}
.wb-answer-card.is-manual-mode:focus-within {
    border-color: var(--vitality-blue);
    box-shadow: inset 0 0 0 1.5px rgba(56, 163, 255, 0.88);
}
:root:not([data-theme="dark"]) .wb-answer-card.is-manual-mode:focus-within {
    box-shadow: inset 0 0 0 2px var(--vitality-blue);
}