/* ==========================================
   MBTI测试系统 - 全局样式
   清新现代风格，适合移动端优先
   ========================================== */

/* ---------- 全局重置 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --primary: #6366F1;
    --primary-light: #818CF8;
    --primary-dark: #4F46E5;
    --accent: #F472B6;
    --bg: #F8FAFC;
    --card-bg: #FFFFFF;
    --text: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --shadow: 0 4px 24px rgba(99, 102, 241, 0.08);
    --shadow-lg: 0 8px 40px rgba(99, 102, 241, 0.15);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ---------- 页面切换 ---------- */
.page {
    display: none;
    min-height: 100vh;
    position: relative;
}

.page.active {
    display: flex;
    flex-direction: column;
}

/* ==========================================
   启动页
   ========================================== */
#page-home {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    justify-content: center;
    align-items: center;
    padding: 24px;
}

.home-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.4;
    animation: float 8s ease-in-out infinite;
}

.orb1 {
    width: 300px; height: 300px;
    background: rgba(255,255,255,0.3);
    top: -100px; right: -80px;
    animation-delay: 0s;
}

.orb2 {
    width: 200px; height: 200px;
    background: rgba(255,200,100,0.3);
    bottom: 20%; left: -60px;
    animation-delay: 2s;
}

.orb3 {
    width: 250px; height: 250px;
    background: rgba(200,100,255,0.25);
    bottom: -80px; right: -40px;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.05); }
}

.home-content {
    position: relative;
    z-index: 1;
    text-align: center;
    width: 100%;
    max-width: 400px;
    animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo-icon {
    font-size: 80px;
    margin-bottom: 16px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.app-title {
    font-size: 32px;
    font-weight: 900;
    color: white;
    margin-bottom: 8px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.app-subtitle {
    font-size: 16px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 32px;
}

.stats-row {
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 16px 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    margin-bottom: 32px;
    border: 1px solid rgba(255,255,255,0.3);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-num {
    font-size: 24px;
    font-weight: 800;
    color: white;
}

.stat-label {
    font-size: 12px;
    color: rgba(255,255,255,0.8);
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: rgba(255,255,255,0.3);
}

.feature-list {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 32px;
    border: 1px solid rgba(255,255,255,0.2);
    text-align: left;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    color: rgba(255,255,255,0.95);
    font-size: 15px;
    font-weight: 500;
}

.feature-item:not(:last-child) {
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.feature-icon {
    font-size: 20px;
}

.btn-start {
    width: 100%;
    padding: 18px 32px;
    background: white;
    color: var(--primary-dark);
    border: none;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    transition: var(--transition);
    margin-bottom: 16px;
}

.btn-start:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.2);
}

.btn-start:active {
    transform: translateY(0);
}

.btn-arrow {
    transition: var(--transition);
}

.btn-start:hover .btn-arrow {
    transform: translateX(4px);
}

.disclaimer {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
}

/* ==========================================
   测试页
   ========================================== */
#page-test {
    background: var(--bg);
}

.test-header {
    background: white;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.progress-bar {
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    transition: width 0.5s ease;
    width: 0%;
}

.test-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.question-counter {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.question-counter span {
    color: var(--primary);
    font-size: 16px;
}

.dim-tag {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.question-area {
    flex: 1;
    padding: 24px 20px;
    overflow-y: auto;
}

.question-card {
    background: white;
    border-radius: var(--radius);
    padding: 28px 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

.question-dim-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.question-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.7;
}

.options-area {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-btn {
    background: white;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    font-size: 15px;
    color: var(--text);
    line-height: 1.5;
    position: relative;
    overflow: hidden;
}

.option-btn:hover {
    border-color: var(--primary-light);
    background: rgba(99, 102, 241, 0.03);
}

.option-btn.selected {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
    color: var(--primary-dark);
    font-weight: 600;
}

.option-btn.selected::before {
    content: '';
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background: var(--primary);
    border-radius: 50%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z'/%3E%3C/svg%3E");
    background-size: 14px;
    background-position: center;
    background-repeat: no-repeat;
}

.opt-emoji {
    font-size: 20px;
    margin-right: 10px;
    vertical-align: middle;
}

.opt-text {
    font-size: 15px;
    vertical-align: middle;
}

.option-btn.selected .opt-text {
    color: var(--primary-dark);
}

.test-footer {
    background: white;
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-prev {
    padding: 10px 16px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-prev:not(:disabled):hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-prev:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.question-dots {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    max-width: 200px;
    justify-content: flex-end;
}

.q-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    transition: var(--transition);
}

.q-dot.answered {
    background: var(--primary-light);
}

.q-dot.current {
    background: var(--primary);
    width: 20px;
    border-radius: 4px;
}

/* ==========================================
   加载页
   ========================================== */
#page-loading {
    background: linear-gradient(135deg, var(--primary), #764ba2);
    justify-content: center;
    align-items: center;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-spinner {
    width: 80px;
    height: 80px;
    position: relative;
    margin: 0 auto 32px;
}

.spinner-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: white;
    animation: spin 1.2s linear infinite;
}

.spinner-ring:nth-child(2) {
    inset: 8px;
    animation-delay: 0.15s;
    border-top-color: rgba(255,255,255,0.7);
}

.spinner-ring:nth-child(3) {
    inset: 16px;
    animation-delay: 0.3s;
    border-top-color: rgba(255,255,255,0.4);
}

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

.loading-text {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
}

.loading-sub {
    font-size: 14px;
    opacity: 0.8;
}

/* ==========================================
   结果页
   ========================================== */
#page-result {
    background: var(--bg);
}

.result-header {
    background: linear-gradient(135deg, var(--primary) 0%, #764ba2 100%);
    padding-bottom: 60px;
    position: relative;
    overflow: hidden;
}

.result-bg-pattern {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
                      radial-gradient(circle at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 40%);
}

.result-hero {
    position: relative;
    z-index: 1;
    padding: 40px 24px 0;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    margin-bottom: 16px;
    backdrop-filter: blur(4px);
}

.hero-emoji {
    font-size: 64px;
    margin-bottom: 12px;
    display: block;
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.hero-type {
    font-size: 56px;
    font-weight: 900;
    color: white;
    letter-spacing: 8px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.2);
    margin-bottom: 8px;
}

.hero-name {
    font-size: 22px;
    font-weight: 700;
    color: rgba(255,255,255,0.95);
    margin-bottom: 4px;
}

.hero-alias {
    font-size: 14px;
    color: rgba(255,255,255,0.75);
}

.result-body {
    background: var(--bg);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    margin-top: -24px;
    position: relative;
    z-index: 2;
    padding: 8px 16px 80px;
}

.result-section {
    margin-bottom: 24px;
}

.section-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 14px;
    padding-top: 20px;
}

/* 维度条 */
.dimension-bars {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.dim-bar-item {
    background: white;
    border-radius: var(--radius);
    padding: 14px 16px;
    box-shadow: var(--shadow);
}

.dim-bar-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.dim-bar-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.dim-bar-values {
    font-size: 12px;
    color: var(--text-secondary);
}

.dim-bar-track {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    display: flex;
}

.dim-bar-fill-left {
    height: 100%;
    background: var(--primary);
    transition: width 1s ease;
    border-radius: 4px 0 0 4px;
}

.dim-bar-fill-right {
    height: 100%;
    background: var(--accent);
    transition: width 1s ease;
    border-radius: 0 4px 4px 0;
}

.dim-bar-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 6px;
    font-size: 11px;
    color: var(--text-light);
}

/* 性格解读卡片 */
.summary-card {
    background: white;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    line-height: 1.8;
    font-size: 15px;
    color: var(--text);
    border-left: 4px solid var(--primary);
}

/* 优劣势 */
.strength-weakness {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.sw-card {
    background: white;
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
}

.sw-card h3 {
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 10px;
}

.sw-strength h3 { color: #10B981; }
.sw-weakness h3 { color: #F59E0B; }

.sw-card ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sw-card ul li {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
    position: relative;
    padding-left: 12px;
}

.sw-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

/* 职业标签 */
.career-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.career-tag {
    background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(244,114,182,0.1));
    border: 1px solid rgba(99,102,241,0.2);
    color: var(--primary-dark);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
}

.career-tag:hover {
    background: var(--primary);
    color: white;
}

/* 人际关系 */
.relationship-card {
    background: white;
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
}

.rel-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    font-size: 13px;
    color: var(--text);
}

.rel-item:not(:last-child) {
    border-bottom: 1px solid var(--border);
}

.rel-badge {
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
}

.rel-badge.star { background: #FEF3C7; color: #D97706; }
.rel-badge.good { background: #D1FAE5; color: #059669; }
.rel-badge.warn { background: #FEE2E2; color: #DC2626; }

/* 成长建议 */
.growth-card {
    background: white;
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
}

.growth-item {
    display: flex;
    gap: 10px;
    padding: 10px 0;
    font-size: 13px;
    color: var(--text);
    line-height: 1.6;
}

.growth-item:not(:last-child) {
    border-bottom: 1px solid var(--border);
}

.growth-num {
    width: 22px;
    height: 22px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    flex-shrink: 0;
}

/* 分享区域 */
.share-section {
    background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(244,114,182,0.05));
    border-radius: var(--radius);
    padding: 20px;
    border: 1px dashed rgba(99,102,241,0.3);
    text-align: center;
}

.share-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.share-cards {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    justify-content: center;
}

.share-card-item {
    width: 140px;
    height: 200px;
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.share-card-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.share-card-item canvas {
    width: 100%;
    height: 100%;
}

.btn-share-main {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #07C160, #06AD56);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    margin-bottom: 10px;
    transition: var(--transition);
}

.btn-share-main:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-share-secondary {
    width: 100%;
    padding: 12px;
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

/* 重试 */
.retry-section {
    text-align: center;
    padding: 20px 0;
}

.btn-retry {
    padding: 12px 32px;
    background: white;
    border: 2px solid var(--border);
    border-radius: 50px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-retry:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ==========================================
   分享卡片弹窗
   ========================================== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 100;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

.share-card-modal {
    background: white;
    border-radius: var(--radius);
    padding: 24px;
    max-width: 360px;
    width: 100%;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    background: rgba(0,0,0,0.05);
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-tip {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 12px;
}

/* ==========================================
   Toast提示
   ========================================== */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(30, 41, 59, 0.9);
    color: white;
    padding: 12px 24px;
    border-radius: 50px;
    font-size: 14px;
    opacity: 0;
    transition: var(--transition);
    z-index: 200;
    white-space: nowrap;
    backdrop-filter: blur(10px);
}

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

/* ==========================================
   5级量表样式
   ========================================== */
.scale-container {
    background: white;
    border-radius: var(--radius);
    padding: 20px 16px;
    box-shadow: var(--shadow);
}

.scale-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    padding: 0 4px;
}

.scale-label-left,
.scale-label-right {
    font-size: 12px;
    font-weight: 600;
}

.scale-label-left {
    color: #EF4444;
}

.scale-label-right {
    color: #22C55E;
}

.scale-buttons {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    gap: 6px;
}

.scale-btn {
    flex: 1;
    border: 2px solid var(--border);
    background: white;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 12px 4px;
    gap: 6px;
    min-height: 72px;
}

.scale-btn:hover {
    border-color: var(--primary-light);
    background: rgba(99, 102, 241, 0.04);
    transform: scale(1.04);
}

.scale-btn:active {
    transform: scale(0.97);
}

.scale-btn.selected {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(244,114,182,0.12));
    transform: scale(1.04);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.2);
}

.scale-btn-icon {
    font-size: 22px;
    line-height: 1;
}

.scale-btn.selected .scale-btn-icon {
    transform: scale(1.2);
}

.scale-btn-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.scale-btn.selected .scale-btn-label {
    color: var(--primary-dark);
    font-weight: 700;
}

.scale-selected-label {
    text-align: center;
    margin-top: 12px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: none;
    animation: fadeInUp 0.2s ease;
    background: rgba(99, 102, 241, 0.08);
    padding: 8px 16px;
    border-radius: 20px;
}

/* 进度段样式 */
.progress-segment {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 3px 6px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
    background: white;
    transition: var(--transition);
}

.progress-segment.active {
    border-width: 2px;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.15);
}

.progress-segment.completed {
    background: var(--primary);
    border-color: var(--primary);
}

.segment-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 16px;
    text-align: center;
}

.progress-segment.completed .segment-label {
    color: white;
}

.segment-dots {
    display: flex;
    gap: 1.5px;
    flex-wrap: nowrap;
}

.mini-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--border);
    transition: var(--transition);
}

.mini-dot.answered {
    background: var(--primary-light);
}

.mini-dot.current {
    background: var(--primary);
    transform: scale(1.5);
    box-shadow: 0 0 4px var(--primary);
}

/* ==========================================
   响应式
   ========================================== */
@media (max-width: 375px) {
    .hero-type { font-size: 44px; letter-spacing: 6px; }
    .strength-weakness { grid-template-columns: 1fr; }
    .share-cards { flex-direction: column; align-items: center; }
    .share-card-item { width: 160px; }
}

@media (min-width: 768px) {
    .question-area {
        max-width: 600px;
        margin: 0 auto;
    }
    .result-body {
        max-width: 600px;
        margin: -24px auto 0;
        padding: 8px 24px 80px;
    }
}

/* ===== 关于我们页面 ===== */
#page-about { display: none; padding: 0; background: linear-gradient(180deg, #667eea 0%, #764ba2 100%); min-height: 100vh; }
#page-about.active { display: block; }

.about-header {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(20px);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.about-header h2 {
  color: #fff;
  font-size: 20px;
  font-weight: 600;
  margin: 0;
  flex: 1;
  text-align: center;
  padding-right: 60px;
}
.btn-back {
  background: rgba(255,255,255,0.2);
  border: none;
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
  cursor: pointer;
}

.about-content {
  padding: 24px 20px 60px;
  max-width: 640px;
  margin: 0 auto;
}
.about-section {
  background: #fff;
  border-radius: 16px;
  padding: 24px 20px;
  margin-bottom: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.about-section h3 {
  color: #333;
  font-size: 17px;
  margin: 0 0 14px 0;
  padding-bottom: 10px;
  border-bottom: 2px solid #f0f0f0;
}
.about-section > p {
  color: #555;
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
}
.about-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.about-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: #555;
  font-size: 14px;
  line-height: 1.7;
  padding: 8px 0;
  border-bottom: 1px solid #f5f5f5;
}
.about-list li:last-child { border-bottom: none; }
.about-list .dot {
  background: #667eea;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  min-width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding: 0 4px;
}

.crowd-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.crowd-item {
  background: #f8f6ff;
  border-radius: 12px;
  padding: 14px 12px;
  font-size: 13px;
  color: #555;
  line-height: 1.6;
  text-align: center;
}
.crowd-item strong { color: #333; font-size: 14px; }

.pricing-table {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.price-item {
  border-radius: 12px;
  padding: 20px 14px;
  text-align: center;
}
.price-free {
  background: #f5f5f5;
  border: 2px solid #e0e0e0;
}
.price-pro {
  background: linear-gradient(135deg, #667eea, #764ba2);
  border: 2px solid transparent;
  color: #fff;
}
.price-name {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
  opacity: 0.8;
}
.price-free .price-name { color: #888; }
.price-amount {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 10px;
}
.price-free .price-amount { color: #333; }
.price-desc {
  font-size: 12px;
  line-height: 1.7;
  opacity: 0.85;
}
.price-unit { font-size: 13px; font-weight: 400; }

.about-contact p {
  margin: 6px 0;
  color: #555;
  font-size: 14px;
}

/* 关于我们入口链接 */
.about-entry {
  text-align: center;
  padding: 16px;
}
.about-link {
  color: rgba(255,255,255,0.7);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.3);
  padding-bottom: 2px;
}
.about-link:hover { color: #fff; border-color: #fff; }

@media (max-width: 400px) {
  .crowd-grid, .pricing-table { grid-template-columns: 1fr; }
}