:root {
    --shui-shell-max-width: 1240px;
    --shui-panel-bg: rgba(255, 255, 255, 0.94);
    --shui-panel-border: rgba(31, 122, 77, 0.18);
    --shui-panel-shadow: 0 16px 40px rgba(15, 53, 35, 0.10);
    --shui-surface-bg: rgba(245, 250, 246, 0.92);
    --shui-surface-border: rgba(31, 122, 77, 0.18);
    --shui-text-strong: #0d3a23;
    --shui-text-muted: rgba(13, 58, 35, 0.65);
    --shui-accent: var(--color-brand-primary);
    --shui-accent-alt: var(--color-brand-secondary);
    --shui-info: var(--color-info);
    --shui-success: var(--color-success);
    --shui-warning: var(--color-warning);
    --shui-gradient-start: #1f7a4d;
    --shui-gradient-end: #2c9760;
    --shui-radius-xl: 14px;
    --shui-radius-lg: 10px;
    --shui-radius-md: 8px;
    --shui-radius-sm: 6px;
    --shui-blur: 14px;

    /* IELTS CBT 风格变量 */
    --ielts-topbar-bg: linear-gradient(180deg, #14532d 0%, #1f7a4d 100%);
    --ielts-topbar-text: #ffffff;
    --ielts-topbar-accent: #ffd54a;
    --ielts-paper-bg: #f6faf7;
    --ielts-paper-border: #bcd8c5;
    --ielts-rule-line: #d0e3d5;

    /* Bauhaus Theme Variables for Settings View — green palette */
    --bauhaus-text-main: #0d3a23;
    --bauhaus-text-muted: #4a6e58;
    --bauhaus-accent-red: #c0392b;
    --bauhaus-accent-blue: #1f7a4d;
    --bauhaus-accent-dark: #14532d;
    --bauhaus-glass-border: rgba(31, 122, 77, 0.25);
    --bauhaus-glass-shadow: 0 6px 24px rgba(15, 53, 35, 0.10);

    /* 皮肤系统 — 供 CBT 界面细节引用，默认跟随绿色主题 */
    --cbt-tint-bg: #ecf6ef;
    --cbt-tint-border: #bcd8c5;
    --cbt-nav-text: #2b4d3b;
    --cbt-overlay-bg: rgba(13, 58, 35, 0.85);
    --cbt-boot-border: rgba(255, 213, 74, 0.4);
}

/* ============ 皮肤：橙色亮丽 ============ */
:root[data-theme="orange"] {
    --shui-panel-border: rgba(249, 115, 22, 0.20);
    --shui-surface-bg: rgba(255, 247, 237, 0.92);
    --shui-surface-border: rgba(249, 115, 22, 0.20);
    --shui-text-strong: #7c2d12;
    --shui-text-muted: rgba(124, 45, 18, 0.65);
    --shui-accent: #f97316;
    --shui-accent-alt: #fb923c;
    --shui-gradient-start: #f97316;
    --shui-gradient-end: #fb923c;
    --ielts-topbar-bg: linear-gradient(180deg, #c2410c 0%, #f97316 100%);
    --ielts-topbar-accent: #ffd54a;
    --ielts-paper-bg: #fff8f2;
    --ielts-rule-line: #f6c9a0;
    --bauhaus-text-main: #7c2d12;
    --bauhaus-text-muted: #b45309;
    --bauhaus-accent-blue: #f97316;
    --bauhaus-accent-dark: #c2410c;
    --bauhaus-glass-border: rgba(249, 115, 22, 0.28);
    --cbt-tint-bg: #fff1e6;
    --cbt-tint-border: #f6c9a0;
    --cbt-nav-text: #9a3412;
    --cbt-overlay-bg: rgba(124, 45, 18, 0.85);
    --cbt-boot-border: rgba(255, 213, 74, 0.4);
}

/* ============ 皮肤：亮黄色 ============ */
:root[data-theme="yellow"] {
    --shui-panel-border: rgba(234, 179, 8, 0.22);
    --shui-surface-bg: rgba(255, 253, 240, 0.92);
    --shui-surface-border: rgba(234, 179, 8, 0.22);
    --shui-text-strong: #7a5b00;
    --shui-text-muted: rgba(122, 91, 0, 0.65);
    --shui-accent: #eab308;
    --shui-accent-alt: #fde047;
    --shui-gradient-start: #eab308;
    --shui-gradient-end: #fde047;
    --ielts-topbar-bg: linear-gradient(180deg, #a16207 0%, #eab308 100%);
    --ielts-topbar-accent: #ff8a3d;
    --ielts-paper-bg: #fffdf0;
    --ielts-rule-line: #f0da70;
    --bauhaus-text-main: #7a5b00;
    --bauhaus-text-muted: #92720a;
    --bauhaus-accent-blue: #eab308;
    --bauhaus-accent-dark: #a16207;
    --bauhaus-glass-border: rgba(234, 179, 8, 0.30);
    --cbt-tint-bg: #fff9db;
    --cbt-tint-border: #f0da70;
    --cbt-nav-text: #7a5b00;
    --cbt-overlay-bg: rgba(122, 91, 0, 0.85);
    --cbt-boot-border: rgba(255, 138, 61, 0.4);
}

/* ============ 皮肤：粉色 ============ */
:root[data-theme="pink"] {
    --shui-panel-border: rgba(236, 72, 153, 0.20);
    --shui-surface-bg: rgba(253, 242, 248, 0.92);
    --shui-surface-border: rgba(236, 72, 153, 0.20);
    --shui-text-strong: #831843;
    --shui-text-muted: rgba(131, 24, 67, 0.65);
    --shui-accent: #ec4899;
    --shui-accent-alt: #f472b6;
    --shui-gradient-start: #ec4899;
    --shui-gradient-end: #f472b6;
    --ielts-topbar-bg: linear-gradient(180deg, #9d174d 0%, #ec4899 100%);
    --ielts-topbar-accent: #ffd166;
    --ielts-paper-bg: #fff5fa;
    --ielts-rule-line: #f9c9de;
    --bauhaus-text-main: #831843;
    --bauhaus-text-muted: #be185d;
    --bauhaus-accent-blue: #ec4899;
    --bauhaus-accent-dark: #9d174d;
    --bauhaus-glass-border: rgba(236, 72, 153, 0.28);
    --cbt-tint-bg: #fdf2f8;
    --cbt-tint-border: #f9c9de;
    --cbt-nav-text: #9d174d;
    --cbt-overlay-bg: rgba(131, 24, 67, 0.85);
    --cbt-boot-border: rgba(255, 209, 102, 0.4);
}

/* ============ 皮肤：冬季·白色 ============ */
:root[data-theme="white"] {
    --shui-panel-border: rgba(148, 163, 184, 0.30);
    --shui-surface-bg: rgba(248, 250, 252, 0.94);
    --shui-surface-border: rgba(148, 163, 184, 0.28);
    --shui-text-strong: #1e293b;
    --shui-text-muted: rgba(30, 41, 59, 0.62);
    --shui-accent: #3b82f6;
    --shui-accent-alt: #93c5fd;
    --shui-gradient-start: #60a5fa;
    --shui-gradient-end: #bfdbfe;
    --ielts-topbar-bg: linear-gradient(180deg, #64748b 0%, #94a3b8 100%);
    --ielts-topbar-accent: #bfdbfe;
    --ielts-paper-bg: #f8fafc;
    --ielts-rule-line: #dbe4ee;
    --bauhaus-text-main: #1e293b;
    --bauhaus-text-muted: #475569;
    --bauhaus-accent-blue: #3b82f6;
    --bauhaus-accent-dark: #334155;
    --bauhaus-glass-border: rgba(148, 163, 184, 0.32);
    --cbt-tint-bg: #eef2f7;
    --cbt-tint-border: #dbe4ee;
    --cbt-nav-text: #334155;
    --cbt-overlay-bg: rgba(30, 41, 59, 0.82);
    --cbt-boot-border: rgba(191, 219, 254, 0.4);
}

body.hero-body {
    color: var(--shui-text-strong);
    position: relative;
    z-index: 0;
    isolation: isolate;
    background: var(--ielts-paper-bg);
    animation: none;
}

#shui-three-bg {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    transform: translateZ(0);
    backface-visibility: hidden;
    will-change: transform;
}

:root:not([data-theme="blue"]) body.hero-body::before {
    display: none;
}

.hero-shell {
    position: relative;
    z-index: 1;
    max-width: var(--shui-shell-max-width);
    margin: 0 auto;
    padding: clamp(32px, 5vw, 72px) clamp(16px, 5vw, 48px) 80px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.hero-header {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hero-header h1 {
    font-size: clamp(2.2rem, 4.5vw, 3.4rem);
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    letter-spacing: -0.02em;
    color: var(--shui-text-strong);
}

.hero-badge {
    font-size: 0.78rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    padding: 5px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    background: linear-gradient(135deg, var(--shui-accent) 0%, var(--shui-accent-alt) 100%);
    color: var(--color-white);
}

.hero-badge--cta {
    border: none;
    cursor: pointer;
    box-shadow: 0 12px 30px rgba(31, 122, 77, 0.35);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hero-badge--cta:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.75);
    outline-offset: 2px;
}

.hero-badge--cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 18px 36px rgba(118, 75, 162, 0.4);
}

.hero-header p {
    color: var(--shui-text-muted);
    font-size: 1.05rem;
}

.hero-nav {
    position: relative;
    display: flex;
    gap: 4px;
    padding: 6px;
    background: rgba(245, 245, 247, 0.55);
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.7);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04),
                inset 0 -1px 1px rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    overflow: hidden;
    isolation: isolate;
}

.hero-nav::before {
    display: none;
}

.hero-nav__liquid-indicator {
    position: absolute;
    left: 0;
    top: 0;
    z-index: 1;
    pointer-events: none;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.45), rgba(255, 255, 255, 0.05));
    box-shadow: 
        inset 0 2px 3px rgba(255, 255, 255, 0.9), 
        inset 0 -2px 5px rgba(255, 255, 255, 0.2),
        inset 0 0 10px rgba(255, 255, 255, 0.4),
        0 4px 12px rgba(0, 0, 0, 0.06);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    opacity: 0;
    transition: left 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.15),
                top 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.15),
                width 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.15),
                height 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.15),
                opacity 0.22s ease;
    will-change: left, top, width, height;
}

.hero-nav__btn {
    flex: 1;
    position: relative;
    z-index: 2;
    border: 1px solid transparent;
    background: transparent;
    color: rgba(60, 60, 67, 0.7);
    padding: 10px 14px;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 600;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    transition: color 260ms ease, background 260ms ease, box-shadow 260ms ease;
}

.hero-nav__btn::before {
    display: none;
}

.hero-nav__btn:hover {
    color: rgba(0, 0, 0, 0.85);
    background: rgba(255, 255, 255, 0.45);
    box-shadow: 0 2px 10px rgba(0,0,0,0.03), inset 0 1px 1px rgba(255,255,255,0.7);
}

.hero-nav__btn.active {
    color: #1d1d1f;
    background: transparent;
    box-shadow: none;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.hero-nav__btn.active::before {
    display: none;
}

.hero-nav.hero-nav--liquid-ready .hero-nav__liquid-indicator {
    opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
    .hero-nav__btn,
    .hero-nav__btn::before,
    .hero-nav__liquid-indicator {
        transition: none !important;
        animation: none !important;
    }
}

.ui-emoji-icon {
    display: inline-flex;
    width: 1em;
    height: 1em;
    color: currentColor;
    vertical-align: -0.14em;
    flex: 0 0 auto;
}

.ui-emoji-icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
    stroke-width: 1.8;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.tool-card-icon .ui-emoji-icon,
.theme-name .ui-emoji-icon,
.hero-panel__title .ui-emoji-icon {
    width: 1.15em;
    height: 1.15em;
}

.hero-grid {
    display: grid;
    gap: 20px;
}

.hero-grid--stats {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.hero-card {
    position: relative;
    padding: 24px;
    border-radius: var(--shui-radius-lg);
    background: var(--shui-panel-bg);
    border: 1px solid var(--shui-panel-border);
    box-shadow: var(--shui-panel-shadow);
    backdrop-filter: blur(var(--shui-blur));
    overflow: hidden;
}

.hero-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(255, 255, 255, 0.65), transparent 55%);
    pointer-events: none;
}

.hero-card--stat {
    min-height: 150px;
}

.hero-card__label {
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--shui-text-muted);
}

.hero-card__value {
    font-size: clamp(2.4rem, 4vw, 3.1rem);
    font-weight: 700;
    margin-top: 16px;
    color: var(--shui-text-strong);
}

.hero-card__meta {
    margin-top: 6px;
    color: var(--shui-text-muted);
    font-size: 0.95rem;
}

.hero-panel {
    background: var(--shui-panel-bg);
    border-radius: var(--shui-radius-xl);
    border: 1px solid var(--shui-panel-border);
    padding: clamp(20px, 3vw, 32px);
    box-shadow: var(--shui-panel-shadow);
    backdrop-filter: blur(var(--shui-blur));
}

.hero-panel__header {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
}

.hero-panel__title {
    font-size: 1.45rem;
    font-weight: 600;
    color: var(--shui-text-strong);
}

.hero-panel__actions {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-end;
}

.shui-filter-group {
    justify-content: flex-start;
    gap: 8px;
}

.btn,
.hero-btn,
.hero-panel .btn,
.shui-filter-btn,
.exam-item-action-btn {
    color: #0f172a !important;
}

.shui-filter-btn {
    border-radius: 999px;
    padding: 8px 20px;
}

.hero-panel__muted {
    color: var(--shui-text-muted);
    margin-top: 6px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(31, 122, 77, 0.15);
    color: var(--shui-accent);
}

.hero-section {
    margin-bottom: 32px;
}

.hero-btn,
.hero-panel .btn:not(.hero-btn),
.shui-filter-btn {
    border-radius: var(--shui-radius-sm);
    border: none;
    background-image: linear-gradient(135deg, var(--shui-gradient-start), var(--shui-gradient-end));
    color: var(--color-white);
    padding: 10px 18px;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), background-image var(--transition-normal);
    box-shadow: 0 18px 35px rgba(0, 0, 0, 0.15);
}

.hero-btn:hover,
.hero-panel .btn:not(.hero-btn):hover,
.shui-filter-btn:hover,
.hero-btn:focus-visible,
.hero-panel .btn:not(.hero-btn):focus-visible,
.shui-filter-btn:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 22px 45px rgba(0, 0, 0, 0.22);
}

.hero-btn--ghost,
.hero-panel .btn.btn-secondary,
.shui-filter-btn[data-tone="ghost"] {
    background-image: none;
    background: rgba(255, 255, 255, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.5);
    color: var(--shui-text-strong);
    box-shadow: none;
}

.hero-btn--warn,
.hero-panel .btn.btn-warning {
    background-image: linear-gradient(135deg, rgba(212, 234, 216, 0.85), rgba(212, 234, 216, 1));
    color: #3b1f00;
}

.hero-panel .btn.btn-info {
    background-image: linear-gradient(135deg, rgba(44, 151, 96, 0.85), rgba(44, 151, 96, 1));
}

.hero-panel .btn.btn-secondary {
    color: var(--shui-text-strong);
}

.hero-settings-group {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.hero-settings-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* Specific Button Colors & Exquisite Overrides */

/* Apple Liquid Glassmorphism for Exam Item Action Buttons */
#browse-view .exam-item-action-btn {
    background: rgba(255, 255, 255, 0.35) !important;
    background-image: none !important;
    backdrop-filter: blur(20px) saturate(160%) !important;
    -webkit-backdrop-filter: blur(20px) saturate(160%) !important;
    border: 1px solid rgba(255, 255, 255, 0.5) !important;
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.9) !important;
    border-radius: var(--shui-radius-sm) !important;
    /* 圆角矩形，与卡片、筛选按钮统一 */
    color: #1d1d1f !important;
    font-weight: 600 !important;
    padding: 8px 16px !important;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1) !important;
    transform: translateY(0) scale(1) !important;
}

#browse-view .exam-item-action-btn:hover,
#browse-view .exam-item-action-btn:focus-visible {
    background: rgba(255, 255, 255, 0.58) !important;
    box-shadow:
        0 8px 20px rgba(0, 0, 0, 0.07),
        inset 0 1px 0 rgba(255, 255, 255, 1) !important;
    transform: translateY(-1px) scale(1.01) !important;
    border-color: rgba(255, 255, 255, 0.75) !important;
}

/* Give the "Start" action a warm brand-tinted liquid glass */
#browse-view .exam-item-action-btn[data-action="start"] {
    background: linear-gradient(135deg, rgba(212, 234, 216, 0.3), rgba(44, 151, 96, 0.25)) !important;
    border-color: rgba(212, 234, 216, 0.4) !important;
    color: #2d5a58 !important;
}

#browse-view .exam-item-action-btn[data-action="start"]:hover {
    background: linear-gradient(135deg, rgba(212, 234, 216, 0.5), rgba(44, 151, 96, 0.4)) !important;
    border-color: rgba(44, 151, 96, 0.5) !important;
    box-shadow:
        0 8px 20px rgba(44, 151, 96, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 1) !important;
}

.data-management-panel .data-mgmt-btn {
    background-image: linear-gradient(135deg, var(--shui-gradient-start), var(--shui-gradient-end));
}

.data-management-panel .data-mgmt-btn:hover,
.data-management-panel .data-mgmt-btn:focus-visible {
    background-image: linear-gradient(135deg, rgba(44, 151, 96, 0.8), rgba(44, 151, 96, 1));
    box-shadow: 0 22px 45px rgba(0, 0, 0, 0.2);
}

.category-card .btn[data-action="browse-category"],
.category-card .btn[data-action="start-random-practice"] {
    background-image: none;
    background: rgba(255, 255, 255, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.55);
    color: #0f172a !important;
    box-shadow: 0 18px 35px rgba(15, 23, 42, 0.12);
    backdrop-filter: blur(18px);
}

.category-card .btn[data-action="browse-category"]:hover,
.category-card .btn[data-action="browse-category"]:focus-visible,
.category-card .btn[data-action="start-random-practice"]:hover,
.category-card .btn[data-action="start-random-practice"]:focus-visible {
    background: rgba(255, 255, 255, 0.5);
    transform: translateY(-1px);
    box-shadow: 0 22px 45px rgba(15, 23, 42, 0.18);
}

.shui-filter-btn[data-tone="ghost"] {
    padding: 8px 18px;
}

.category-grid .category-card,
.category-grid .category-card::before {
    background: rgba(255, 255, 255, 0.3);
}

.category-grid .category-card {
    border-radius: var(--shui-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.35);
    box-shadow: 0 24px 50px rgba(15, 23, 42, 0.18);
    backdrop-filter: blur(24px);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.category-grid .category-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(145deg, rgba(212, 234, 216, 0.08), rgba(44, 151, 96, 0.08));
    pointer-events: none;
    mix-blend-mode: screen;
}

.category-grid .category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 35px 60px rgba(15, 23, 42, 0.25);
}


.hero-surface {
    background: var(--shui-surface-bg);
    border-radius: var(--shui-radius-lg);
    border: 1px solid var(--shui-surface-border);
    padding: 20px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

#more-view .more-tools-grid {
    display: grid;
    gap: 18px;
}

#more-view .tool-card {
    border-radius: var(--shui-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(255, 255, 255, 0.28);
    backdrop-filter: blur(18px);
    box-shadow: 0 22px 44px rgba(0, 0, 0, 0.18);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), background var(--transition-normal);
    color: var(--shui-text-strong);
}

#more-view .tool-card:hover,
#more-view .tool-card:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 28px 52px rgba(0, 0, 0, 0.22);
    background: rgba(255, 255, 255, 0.38);
}

#boot-overlay {
    position: fixed;
    inset: 0;
    background: rgba(6, 11, 40, 0.6);
    backdrop-filter: blur(40px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 320ms ease, visibility 320ms ease;
}

#boot-overlay[data-hidden="true"] {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.boot-panel {
    width: min(420px, 90vw);
    padding: 36px;
    border-radius: var(--shui-radius-xl);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.35);
    text-align: center;
    color: var(--color-white);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}

.boot-logo {
    font-size: 1rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.boot-status {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 18px;
    font-size: 0.95rem;
}

.boot-progress {
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.18);
    overflow: hidden;
    margin-bottom: 12px;
}

.boot-progress__bar {
    display: block;
    height: 100%;
    width: 0%;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--shui-accent), var(--shui-accent-alt));
    transition: width 280ms ease;
}

.boot-progress__text {
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.9);
}

@media (max-width: 768px) {
    .hero-nav {
        flex-direction: column;
    }

    .hero-panel__header {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-panel__actions {
        width: 100%;
        justify-content: flex-start;
    }

    .hero-settings-actions {
        flex-direction: column;
    }
}

/* =========================================
   Bauhaus Settings View Styles (Merged)
   ========================================= */

#settings-view {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    margin-top: 20px;
}

#settings-view h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
    color: var(--bauhaus-text-main);
    letter-spacing: -0.03em;
    text-shadow: 0 2px 4px rgba(255, 255, 255, 0.5);
}

#settings-view .hero-settings-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

/* Bauhaus Card Style */
#settings-view .hero-panel {
    /* Updated background for better visibility and pale tint */
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(241, 245, 249, 0.88));
    backdrop-filter: blur(24px) saturate(120%);
    -webkit-backdrop-filter: blur(24px) saturate(120%);
    border: 1px solid var(--bauhaus-glass-border);
    border-radius: var(--shui-radius-lg);
    box-shadow: var(--bauhaus-glass-shadow);
    padding: 32px;
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

#settings-view .hero-panel:hover {
    transform: translateY(-4px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(255, 255, 255, 0.5) inset;
    border-color: rgba(255, 255, 255, 0.9);
}

/* Inner Glow/Highlight */
#settings-view .hero-panel::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

#settings-view h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--bauhaus-text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

#settings-view .hero-panel__muted {
    font-size: 0.9rem;
    color: var(--bauhaus-text-muted);
    margin-bottom: 24px;
}

/* Button Styles - Bauhaus Accents */
#settings-view .btn {
    border-radius: 999px;
    font-weight: 600;
    padding: 10px 24px;
    border: none;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

/* Enhanced Hover Effect */
#settings-view .btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.2), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

#settings-view .btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

#settings-view .btn:hover::after {
    opacity: 1;
}

#settings-view .btn:active {
    transform: translateY(-1px) scale(0.98);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Specific Button Colors */
#settings-view #clear-cache-btn {
    background: rgba(255, 255, 255, 0.7);
    color: var(--bauhaus-accent-red) !important;
    border: 1px solid rgba(220, 38, 38, 0.2);
}

#settings-view #clear-cache-btn:hover {
    background: var(--bauhaus-accent-red);
    color: white !important;
    box-shadow: 0 12px 24px rgba(220, 38, 38, 0.3);
    border-color: transparent;
}

#settings-view #load-library-btn,
#settings-view #library-config-btn,
#settings-view #force-refresh-btn,
#settings-view #theme-switcher-btn-entry {
    background: rgba(255, 255, 255, 0.7);
    color: var(--bauhaus-text-main) !important;
    border: 1px solid rgba(15, 23, 42, 0.15);
}

#settings-view #load-library-btn:hover,
#settings-view #library-config-btn:hover,
#settings-view #force-refresh-btn:hover,
#settings-view #theme-switcher-btn-entry:hover {
    background: var(--bauhaus-accent-blue);
    color: white !important;
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.3);
    border-color: transparent;
}

#settings-view .data-mgmt-btn {
    background: rgba(255, 255, 255, 0.7);
    color: var(--bauhaus-accent-dark) !important;
    border: 1px solid rgba(15, 23, 42, 0.15);
}

#settings-view .data-mgmt-btn:hover {
    background: var(--bauhaus-accent-dark);
    color: white !important;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.25);
    border-color: transparent;
}

#settings-view .hero-surface {
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 12px;
    padding: 16px;
    backdrop-filter: blur(12px);
}

@media (max-width: 768px) {
    #settings-view .hero-settings-group {
        grid-template-columns: 1fr;
    }
}

/* =========================================
   IELTS Computer-delivered Test (CBT) Skin
   仿真雅思官方机考界面：顶栏、字体、按钮风格
   ========================================= */

.ielts-topbar {
    width: 100%;
    background: var(--ielts-topbar-bg);
    color: var(--ielts-topbar-text);
    border-radius: 4px;
    padding: 14px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    flex-wrap: wrap;
    box-shadow: 0 4px 14px rgba(15, 53, 35, 0.18);
    font-family: var(--font-family-primary);
    margin-bottom: 18px;
    border-bottom: 3px solid var(--ielts-topbar-accent);
}

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

.ielts-topbar__logo {
    background: #ffffff;
    color: var(--bauhaus-accent-dark);
    font-weight: 800;
    font-size: 1rem;
    letter-spacing: 0.18em;
    padding: 8px 14px;
    border-radius: 3px;
    border: 2px solid var(--ielts-topbar-accent);
    box-shadow: inset 0 -3px 0 var(--ielts-topbar-accent);
}

.ielts-topbar__titles {
    display: flex;
    flex-direction: column;
    line-height: 1.25;
}

.ielts-topbar__title {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.ielts-topbar__subtitle {
    font-size: 0.82rem;
    opacity: 0.85;
    letter-spacing: 0.03em;
}

.ielts-topbar__meta {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 0.88rem;
    font-weight: 600;
}

.ielts-topbar__candidate,
.ielts-topbar__clock {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 6px 12px;
    border-radius: 3px;
    letter-spacing: 0.04em;
}

.ielts-topbar__clock {
    font-variant-numeric: tabular-nums;
    min-width: 78px;
    text-align: center;
}

.ielts-topbar__divider {
    opacity: 0.4;
}

.ielts-topbar__badge {
    background: var(--ielts-topbar-accent);
    color: var(--bauhaus-accent-dark);
    padding: 6px 12px;
    border-radius: 3px;
    font-weight: 700;
    letter-spacing: 0.04em;
    border: 1px solid rgba(20, 83, 45, 0.25);
}

.hero-header__tagline {
    display: inline-block;
    margin-left: 14px;
    padding: 4px 12px;
    font-size: 0.35em;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    vertical-align: middle;
    color: var(--bauhaus-accent-blue);
    background: var(--cbt-tint-bg);
    border: 1px solid var(--cbt-tint-border);
    border-radius: 3px;
}

.hero-header h1 {
    font-family: var(--font-family-primary);
    color: var(--shui-text-strong);
}

.ielts-footer-credit {
    margin-top: 28px;
    padding: 16px 18px;
    text-align: center;
    border-top: 1px dashed var(--ielts-rule-line);
    background: var(--cbt-tint-bg);
    border-radius: 4px;
    color: var(--bauhaus-accent-dark);
    font-family: var(--font-family-primary);
}

.ielts-footer-credit__line {
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    opacity: 0.8;
    margin-bottom: 4px;
}

.ielts-footer-credit__author {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.ielts-footer-credit__author strong {
    color: var(--bauhaus-accent-blue);
    background: #ffffff;
    padding: 2px 10px;
    border-radius: 3px;
    border: 1px solid var(--cbt-tint-border);
}

/* 让整体界面更接近 IELTS 官方 CBT — 更方正、低圆角、更高对比 */
.hero-panel {
    border-radius: 6px;
    border: 1px solid var(--shui-panel-border);
    background: #ffffff;
    backdrop-filter: none;
}

.hero-card {
    border-radius: 6px;
    border: 1px solid var(--shui-panel-border);
    background: #ffffff;
    backdrop-filter: none;
}

.hero-card::after {
    display: none;
}

.hero-nav {
    border-radius: 4px;
    background: #ffffff;
    border: 1px solid var(--shui-panel-border);
    box-shadow: 0 2px 6px rgba(15, 53, 35, 0.05);
    padding: 4px;
}

.hero-nav__btn {
    border-radius: 3px;
    font-family: var(--font-family-primary);
    font-weight: 600;
    color: var(--cbt-nav-text);
}

.hero-nav__btn.active {
    background: var(--ielts-topbar-bg);
    color: #ffffff;
    text-shadow: none;
}

.hero-nav__btn:hover {
    background: var(--cbt-tint-bg);
    color: var(--bauhaus-accent-dark);
}

.hero-nav.hero-nav--liquid-ready .hero-nav__liquid-indicator {
    display: none;
}

.hero-btn,
.hero-panel .btn:not(.hero-btn),
.shui-filter-btn {
    border-radius: 4px;
    background-image: linear-gradient(180deg, var(--bauhaus-accent-blue) 0%, var(--bauhaus-accent-dark) 100%);
    color: #ffffff;
    font-weight: 600;
    letter-spacing: 0.02em;
    box-shadow: 0 2px 4px rgba(15, 53, 35, 0.18);
    border: 1px solid var(--bauhaus-accent-dark);
}

.hero-btn:hover,
.hero-panel .btn:not(.hero-btn):hover,
.shui-filter-btn:hover {
    background-image: linear-gradient(180deg, var(--shui-gradient-end) 0%, var(--bauhaus-accent-blue) 100%);
    box-shadow: 0 4px 8px rgba(15, 53, 35, 0.22);
    transform: translateY(-1px);
}

.hero-btn--ghost,
.hero-panel .btn.btn-secondary,
.shui-filter-btn[data-tone="ghost"] {
    background: #ffffff;
    background-image: none;
    border: 1px solid var(--cbt-tint-border);
    color: var(--bauhaus-accent-blue);
    box-shadow: none;
}

.shui-filter-btn.active,
.shui-filter-btn[aria-pressed="true"] {
    background-image: linear-gradient(180deg, var(--bauhaus-accent-blue) 0%, var(--bauhaus-accent-dark) 100%) !important;
    color: #ffffff !important;
    border-color: var(--bauhaus-accent-dark) !important;
}

/* 设置页 — 沿用同一套绿色 */
#settings-view .hero-panel {
    background: #ffffff;
    border: 1px solid var(--shui-panel-border);
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(15, 53, 35, 0.06);
    backdrop-filter: none;
}

#settings-view .hero-panel:hover {
    transform: none;
    box-shadow: 0 4px 12px rgba(15, 53, 35, 0.10);
}

#settings-view #load-library-btn:hover,
#settings-view #library-config-btn:hover,
#settings-view #force-refresh-btn:hover,
#settings-view #theme-switcher-btn-entry:hover {
    background: var(--bauhaus-accent-blue);
}

#settings-view .data-mgmt-btn {
    background: #ffffff;
    color: var(--bauhaus-accent-dark) !important;
    border: 1px solid var(--cbt-tint-border);
}

#settings-view .data-mgmt-btn:hover {
    background: var(--bauhaus-accent-dark);
    color: #ffffff !important;
    box-shadow: 0 6px 14px rgba(20, 83, 45, 0.20);
}

#settings-view h2,
#settings-view h3 {
    font-family: var(--font-family-primary);
    color: var(--bauhaus-accent-dark);
}

/* 启动屏 — 跟随当前皮肤 */
#boot-overlay {
    background: var(--cbt-overlay-bg);
}

.boot-panel {
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--cbt-boot-border);
}

.boot-logo {
    color: var(--ielts-topbar-accent);
    font-weight: 800;
}

.boot-progress__bar {
    background: linear-gradient(90deg, var(--ielts-topbar-accent), #ffffff);
}

/* 题库浏览的视图：纸张白底 */
.view {
    background: #ffffff;
    border-color: var(--cbt-tint-border);
    border-radius: 6px;
}

@media (max-width: 768px) {
    .ielts-topbar {
        flex-direction: column;
        align-items: flex-start;
        padding: 12px 14px;
    }

    .ielts-topbar__meta {
        flex-wrap: wrap;
    }
}