:root {
    --primary-color: #003366; /* 深藏青，稳重专业 */
    --secondary-color: #0056b3; /* 亮蓝，用于交互元素 */
    --accent-color: #0056b3; 
    --bg-color: #f0f2f5; /* 更柔和的背景色 */
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #dcdfe6;
    --success-color: #67c23a;
    --error-color: #f56c6c;
    --shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    --radius: 4px; /* 更偏向商务的圆角 */
    --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* 性能优化 - 减少卡顿 */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: #f4f6f9; /* 浅灰蓝背景，更专业 */
    background-image: linear-gradient(135deg, #f4f6f9 0%, #eef2f5 100%);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* 性能优化 */
    will-change: scroll-position;
}

/* 启用GPU加速 */
.container,
.header-classic,
.form-card {
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

.container {
    width: 100%;
    max-width: 900px; /* 稍微加宽 */
    margin: 30px auto;
    padding: 0 20px;
}

/* Header & Logo - Classic Professional */
.header-classic {
    text-align: center;
    background: #fff;
    /* 添加微妙的纹理背景 */
    background-image: radial-gradient(#f0f2f5 1px, transparent 1px);
    background-size: 20px 20px;
    padding: 40px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08); /* 柔和的阴影 */
    border-top: 6px solid #003366; /* 顶部品牌色厚边框 */
    margin-bottom: 30px;
    position: relative;
}

/* Logo 样式 */
.logo-wrapper {
    margin-bottom: 20px;
}

.logo-img {
    height: 65px; /* 稍微加大 Logo */
    width: auto;
}

/* 公司名称 (中文) */
.org-name {
    color: #003366; /* 深藏青色 */
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 5px;
    letter-spacing: 1px;
}

/* 公司名称 (英文) */
.org-name-en {
    color: #666;
    font-size: 1rem;
    letter-spacing: 1px;
    margin-bottom: 25px;
    font-weight: 500;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

/* 精致分割线 */
.title-divider {
    height: 1px;
    background: #e0e0e0; /* 浅灰底线 */
    width: 70%;
    margin: 0 auto 30px auto;
    position: relative;
}

.title-divider::after {
    content: '';
    position: absolute;
    top: -2px; /* 稍微向上偏移以覆盖 */
    left: 50%;
    transform: translateX(-50%);
    width: 80px; /* 短横线宽度 */
    height: 5px;
    background: #0056b3; /* 亮蓝色强调线 */
    border-radius: 2px;
}

/* 表单标题 (中文) */
.doc-title {
    font-size: 1.6rem;
    color: #2c3e50;
    margin-bottom: 10px;
    font-weight: 600;
}

/* 表单标题 (英文) */
.doc-title-en {
    font-size: 0.8rem;
    color: #95a5a6;
    text-transform: uppercase;
    letter-spacing: 2px; /* 增加字间距，显得更高级 */
    margin: 0;
}

/* Card Style */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 40px;
    margin-bottom: 20px;
    border-top: 3px solid var(--primary-color);
}

/* Form Sections */
.form-section {
    margin-bottom: 30px;
}

.section-header {
    background-color: #f8f9fa;
    padding: 12px 15px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-color);
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
}

.section-header i {
    margin-right: 10px;
    color: var(--secondary-color);
    font-size: 1.2em;
}

.form-group {
    margin-bottom: 22px;
}

.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: flex-end; /* 改为底部对齐，让输入框在同一水平线 */
}

.form-col {
    flex: 1;
    min-width: 280px;
}

/* Labels & Inputs */
.form-label-bold {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
    line-height: 1.4;
    min-height: 60px; /* 增加到60px以适应两行英文 */
}

.form-sublabel {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 8px;
    display: block;
    line-height: 1.4;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.3s;
    background-color: #fff;
    line-height: 1.5;
    min-height: 44px;
    height: 44px; /* 强制固定高度 */
    box-sizing: border-box;
}

/* 隐藏 number 输入框的加减按钮 */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield; /* Firefox */
}

/* Textarea 需要自动高度 */
textarea {
    height: auto;
    min-height: 100px;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 4px rgba(0, 86, 179, 0.15);
}

/* Signature Module */
.signature-module {
    background: #fff;
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--secondary-color); /* 区分颜色 */
}

.module-header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.module-header h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 5px;
}

.module-header p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.signature-container {
    border: 2px dashed #b4bccc;
    border-radius: var(--radius);
    background-color: #fcfcfc;
    padding: 5px;
    position: relative;
    transition: border-color 0.3s;
}

.signature-container:hover {
    border-color: var(--secondary-color);
    background-color: #fff;
}

#signature-pad {
    width: 100%;
    height: 200px;
    display: block;
    cursor: crosshair;
    touch-action: none;
}

.signature-actions {
    margin-top: 8px;
    text-align: right;
}

.btn-clear {
    background-color: #fff;
    border: 1px solid var(--border-color);
    color: var(--text-light);
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.btn-clear:hover {
    border-color: var(--text-light);
    color: var(--text-color);
}

/* Submit Button */
.btn-submit {
    display: block;
    width: 100%;
    max-width: 300px;
    margin: 30px auto 0;
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    box-shadow: 0 4px 6px rgba(0, 51, 102, 0.2);
}

.btn-submit:hover {
    background-color: var(--secondary-color);
    box-shadow: 0 6px 8px rgba(0, 51, 102, 0.3);
}

.btn-submit:active {
    transform: translateY(1px);
}

.btn-submit:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    box-shadow: none;
}

/* Footer */
.footer {
    text-align: center;
    margin: 40px 0;
    color: var(--text-light);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        margin: 15px auto;
        padding: 0 10px;
    }
    
    .card {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 1.4rem;
    }
    
    .header h2 {
        font-size: 1.1rem;
    }
    
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    
    .form-col {
        min-width: 100%;
    }
    
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="date"],
    input[type="number"],
    select {
        font-size: 16px; /* 防止iOS放大 */
    }
}

/* Additional Utility Classes */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 15px;
}

.input-group-text {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Accordion Styles */
.accordion-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 15px;
    background: #fff;
    overflow: hidden;
    transition: box-shadow 0.3s;
}

.accordion-item:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.accordion-header {
    background-color: #f8f9fa;
    padding: 15px 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: background-color 0.2s;
}

.accordion-header:hover {
    background-color: #f0f2f5;
}

.accordion-header h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 600;
    display: flex;
    align-items: center;
}

.accordion-header h3 i {
    margin-right: 10px;
    color: var(--secondary-color);
    width: 20px;
    text-align: center;
}

.accordion-icon {
    transition: transform 0.3s ease;
    color: var(--text-light);
    font-size: 0.8rem;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease;
    background-color: #fff;
}

.accordion-item.active .accordion-content {
    max-height: 2000px; /* Large enough to fit content */
    padding: 20px;
    border-top: 1px solid var(--border-color);
    transition: max-height 0.5s ease-in, padding 0.3s ease;
}

/* Control Bar */
.control-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 0 5px;
}

.toggle-all-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 4px;
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: all 0.2s;
}

.toggle-all-btn:hover {
    background-color: #eef2f5;
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

/* Dark Mode Toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-color);
    padding: 5px;
    border-radius: 50%;
    transition: background-color 0.3s;
}

.theme-toggle:hover {
    background-color: rgba(0,0,0,0.05);
}

/* Dark Mode Styles */
body.dark-mode {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --text-light: #a0a0a0;
    --border-color: #404040;
    --primary-color: #4da3ff; /* Lighter blue for dark mode */
    --secondary-color: #66b2ff;
    background-image: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
}

body.dark-mode .header-classic {
    background: #2d2d2d;
    background-image: radial-gradient(#333 1px, transparent 1px);
    border-top-color: var(--primary-color);
}

body.dark-mode .org-name {
    color: #fff;
}

body.dark-mode .doc-title {
    color: #e0e0e0;
}

body.dark-mode .accordion-item {
    background: #2d2d2d;
    border-color: #404040;
}

body.dark-mode .accordion-header {
    background-color: #333;
}

body.dark-mode .accordion-header:hover {
    background-color: #3d3d3d;
}

body.dark-mode .accordion-content {
    background-color: #2d2d2d;
    border-top-color: #404040;
}

body.dark-mode input,
body.dark-mode select,
body.dark-mode textarea {
    background-color: #333;
    border-color: #404040;
    color: #e0e0e0;
}

body.dark-mode input:focus,
body.dark-mode select:focus,
body.dark-mode textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(77, 163, 255, 0.15);
}

body.dark-mode .signature-container {
    background-color: #333;
    border-color: #404040;
}

body.dark-mode .btn-clear {
    background-color: #333;
    border-color: #404040;
    color: #a0a0a0;
}

body.dark-mode .btn-clear:hover {
    color: #fff;
    border-color: #fff;
}

body.dark-mode .toggle-all-btn {
    border-color: #404040;
    color: #e0e0e0;
}

body.dark-mode .toggle-all-btn:hover {
    background-color: #333;
}

body.dark-mode .theme-toggle {
    color: #ffd700; /* Gold for moon/sun */
}

body.dark-mode .theme-toggle:hover {
    background-color: rgba(255,255,255,0.1);
}

/* Auth Buttons */
.btn-auth {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 15px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
}

.btn-auth:hover {
    background: rgba(0,0,0,0.05);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

body.dark-mode .btn-auth {
    border-color: #404040;
    color: #e0e0e0;
}

body.dark-mode .btn-auth:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--primary-color);
}

/* ==========================================
   进度指示器
   ========================================== */
.progress-indicator {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    padding: 25px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    position: relative;
}

.progress-indicator::before {
    content: '';
    position: absolute;
    top: 44px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: var(--border-color);
    z-index: 0;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 1;
    flex: 1;
}

.progress-step-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-light);
    transition: all 0.3s ease;
    margin-bottom: 8px;
}

.progress-step-label {
    font-size: 12px;
    color: var(--text-light);
    text-align: center;
    transition: color 0.3s ease;
}

.progress-step.active .progress-step-circle {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.progress-step.active .progress-step-label {
    color: var(--primary-color);
    font-weight: 600;
}

.progress-step.completed .progress-step-circle {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.progress-step.completed .progress-step-circle::after {
    content: '✓';
    position: absolute;
}

.progress-step.completed .progress-step-label {
    color: var(--success-color);
}

/* 深色模式适配 */
body.dark-mode .progress-indicator {
    background: #1a1a1a;
}

body.dark-mode .progress-indicator::before {
    background: #404040;
}

body.dark-mode .progress-step-circle {
    background: #1a1a1a;
    border-color: #404040;
}

/* ==========================================
   移动端响应式优化
   ========================================== */
@media (max-width: 768px) {
    /* 进度指示器移动端优化 */
    .progress-indicator {
        padding: 15px 10px;
        overflow-x: auto;
        justify-content: flex-start;
        gap: 15px;
    }
    
    .progress-indicator::before {
        display: none;
    }
    
    .progress-step {
        min-width: 60px;
        flex: 0 0 auto;
    }
    
    .progress-step-circle {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
    
    .progress-step-label {
        font-size: 10px;
        max-width: 60px;
        line-height: 1.2;
    }
    
    /* 容器优化 */
    .container {
        margin: 15px auto;
        padding: 0 15px;
    }
    
    /* Header 优化 */
    .header-classic {
        padding: 25px 20px;
        margin-bottom: 20px;
    }
    
    .logo-img {
        max-height: 50px;
    }
    
    .doc-title {
        font-size: 18px;
        margin: 12px 0 5px 0;
    }
    
    .doc-title-en {
        font-size: 11px;
    }
    
    /* 表单间距优化 - 增加点击区域 */
    .form-group {
        margin-bottom: 20px;
    }
    
    /* 输入框优化 */
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="number"],
    input[type="date"],
    select,
    textarea {
        font-size: 16px !important; /* 防止 iOS 自动缩放 */
        min-height: 48px; /* 增加触摸区域 */
        padding: 14px 16px;
    }
    
    /* Select 下拉框优化 */
    select {
        background-size: 16px;
        padding-right: 40px;
    }
    
    /* Textarea 优化 */
    textarea {
        min-height: 120px;
        padding: 14px 16px;
    }
    
    /* 按钮优化 */
    button,
    .btn-submit {
        min-height: 48px;
        font-size: 16px;
        padding: 12px 20px;
    }
    
    /* Radio 和 Checkbox 优化 */
    .radio-group label,
    .checkbox-label {
        min-height: 44px; /* 增加点击区域 */
        padding: 12px;
        display: flex;
        align-items: center;
    }
    
    input[type="radio"],
    input[type="checkbox"] {
        width: 20px;
        height: 20px;
        margin-right: 10px;
    }
    
    /* 签名板优化 */
    #signature-pad {
        width: calc(100vw - 30px);
        margin-left: -15px;
        margin-right: -15px;
        border-radius: 0;
    }
    
    /* 控制栏优化 */
    .control-bar {
        flex-direction: column;
        gap: 10px;
        padding: 15px;
    }
    
    .auth-links {
        width: 100%;
        justify-content: center;
        margin-left: 0 !important;
    }
    
    .toggle-all-btn,
    .theme-toggle {
        width: 100%;
        justify-content: center;
    }
    
    /* Accordion 优化 */
    .accordion-header {
        padding: 15px;
        font-size: 16px;
    }
    
    .accordion-content {
        padding: 20px 15px;
    }
    
    /* 表单行布局 */
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    
    .form-col {
        width: 100%;
    }
    
    /* 受益人卡片优化 */
    .beneficiary-item {
        padding: 15px;
        margin: 0 -5px 15px -5px;
    }
    
    /* 签名清除按钮优化 */
    #clear-signature {
        width: 100%;
        margin-top: 10px;
    }
    
    /* Toast 消息优化 */
    .auto-save-toast {
        top: 10px !important;
        right: 10px !important;
        left: 10px !important;
        text-align: center;
        font-size: 13px !important;
    }
}

/* 小屏手机优化 (< 375px) */
@media (max-width: 374px) {
    .doc-title {
        font-size: 16px;
    }
    
    .form-label-bold,
    .form-sublabel {
        font-size: 13px;
    }
    
    input, select, textarea {
        font-size: 14px !important;
    }
}

/* 平板横屏优化 */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 720px;
    }
    
    .form-row {
        gap: 15px;
    }
}

/* ============================================
   表单验证增强样式（前台）
   ============================================ */

.form-group-enhanced {
    margin-bottom: 24px;
    position: relative;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 12px;
    color: var(--text-light);
    transition: color 0.2s;
    z-index: 1;
    pointer-events: none;
}

.input-wrapper input,
.input-wrapper select,
.input-wrapper textarea {
    padding-left: 40px;
    padding-right: 40px;
    border: 2px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.input-wrapper input:focus,
.input-wrapper select:focus,
.input-wrapper textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
    outline: none;
}

.input-wrapper input:focus + .input-icon,
.input-wrapper select:focus + .input-icon,
.input-wrapper textarea:focus + .input-icon {
    color: var(--primary-color);
}

/* 验证状态 */
.input-wrapper.valid input,
.input-wrapper.valid select,
.input-wrapper.valid textarea {
    border-color: var(--success-color);
    background-color: #f6ffed;
}

.input-wrapper.valid .input-status {
    opacity: 1;
    color: var(--success-color);
}

.input-wrapper.invalid input,
.input-wrapper.invalid select,
.input-wrapper.invalid textarea {
    border-color: var(--error-color);
    background-color: #fff2f0;
}

.input-wrapper.invalid .input-status {
    opacity: 1;
    color: var(--error-color);
}

.input-wrapper.invalid .input-status i::before {
    content: "\f06a";
}

.input-status {
    position: absolute;
    right: 12px;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
    font-size: 16px;
}

/* 抖动动画 */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    50% { transform: translateX(10px); }
    75% { transform: translateX(-5px); }
}

.shake {
    animation: shake 0.3s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

/* 字段消息 */
.field-message {
    margin-top: 8px;
    font-size: 13px;
    display: none;
    align-items: center;
    gap: 6px;
    padding: 4px 0;
}

.field-message.success {
    display: flex;
    color: var(--success-color);
}

.field-message.error {
    display: flex;
    color: var(--error-color);
}

.field-message i {
    font-size: 12px;
}

/* 必填标记 */
.required {
    color: var(--error-color);
    margin-left: 2px;
}

/* 帮助图标 */
.help-icon {
    display: inline-block;
    margin-left: 4px;
    color: var(--text-light);
    cursor: help;
    transition: color 0.2s;
}

.help-icon:hover {
    color: var(--primary-color);
}

/* Tooltip */
[data-tooltip] {
    position: relative;
}

[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    z-index: 1000;
    margin-bottom: 8px;
}

[data-tooltip]:hover::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.9);
    margin-bottom: 2px;
}

/* 加载条 */
.loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: transparent;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.2s;
}

.loading-bar.active {
    opacity: 1;
}

.loading-bar-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--primary-color);
}

/* 加载遮罩 */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.loading-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* 按钮加载状态 */
.btn.loading,
button.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn.loading::after,
button.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    color: white;
}

/* 自动保存指示器 */
.auto-save-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: white;
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--success-color);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none;
    z-index: 1000;
    will-change: opacity, transform;
}

.auto-save-indicator.show {
    opacity: 1;
    transform: translateY(0);
}

.auto-save-indicator i {
    animation: none; /* 移除可能的旋转动画 */
}

/* ============================================
   性能优化 - 减少重绘和回流
   ============================================ */

/* 优化所有过渡效果，只使用transform和opacity */
input,
textarea,
select,
button {
    transition: border-color 0.2s ease, background-color 0.2s ease, opacity 0.2s ease;
}

/* 优化悬浮效果 */
.btn-submit:hover,
button:hover {
    transform: translateY(-1px);
    transition: transform 0.2s ease, background-color 0.2s ease;
}

/* 移除可能导致卡顿的背景动画 */
body {
    background-attachment: scroll; /* 避免fixed导致的性能问题 */
}

/* 优化固定定位元素 */
.chat-widget,
.auto-save-indicator {
    transform: translateZ(0);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

/* 移除不必要的阴影过渡 */
.form-card,
.header-classic {
    transition: none;
}
    font-size: 16px;
}

/* 按钮触摸优化 */
@media (hover: none) and (pointer: coarse) {
    .btn,
    button,
    .submit-btn {
        min-height: 48px;
        padding: 14px 28px;
        font-size: 16px;
    }
}



/* ============================================
   多步骤表单样式
   ============================================ */

/* 步骤导航按钮容器 */
.step-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
    margin: 30px 0 20px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* 步骤按钮基础样式 */
.btn-step {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
    justify-content: center;
}

/* 上一步按钮 */
.btn-prev {
    background: #fff;
    color: var(--primary-color);
    border: 2px solid var(--border-color);
}

.btn-prev:hover {
    background: #f5f7fa;
    border-color: var(--primary-color);
    transform: translateX(-2px);
}

/* 下一步按钮 */
.btn-next {
    background: var(--primary-color);
    color: #fff;
    margin-left: auto;
}

.btn-next:hover {
    background: var(--secondary-color);
    transform: translateX(2px);
}

/* 提交按钮 */
.btn-submit {
    background: var(--success-color);
    color: #fff;
    margin-left: auto;
}

.btn-submit:hover {
    background: #85ce61;
    box-shadow: 0 4px 12px rgba(103, 194, 58, 0.3);
}

/* 进度指示器增强样式 */
.progress-step.completed .progress-step-circle {
    background: var(--success-color);
    color: #fff;
    border-color: var(--success-color);
}

.progress-step.completed .progress-step-circle::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 14px;
}

.progress-step.completed .progress-step-label {
    color: var(--success-color);
    font-weight: 600;
}

.progress-step.active .progress-step-circle {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 51, 102, 0.1);
    animation: pulse 2s infinite;
}

.progress-step.active .progress-step-label {
    color: var(--primary-color);
    font-weight: 600;
}

/* 脉冲动画 */
@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 4px rgba(0, 51, 102, 0.1);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(0, 51, 102, 0.2);
    }
}

/* 可点击的已完成步骤悬浮效果 */
.progress-step.completed:hover .progress-step-circle {
    transform: scale(1.1);
    transition: transform 0.2s ease;
}

/* 深色模式适配 */
body.dark-mode .step-navigation {
    background: #2c2c2c;
}

body.dark-mode .btn-prev {
    background: #3a3a3a;
    color: #fff;
    border-color: #555;
}

body.dark-mode .btn-prev:hover {
    background: #4a4a4a;
    border-color: var(--secondary-color);
}

/* 响应式适配 */
@media (max-width: 768px) {
    .step-navigation {
        padding: 15px;
        gap: 10px;
    }

    .btn-step {
        padding: 10px 16px;
        font-size: 14px;
        min-width: 100px;
    }

    .btn-step i {
        display: none; /* 移动端隐藏图标节省空间 */
    }
}

@media (max-width: 480px) {
    .step-navigation {
        flex-direction: column;
        gap: 10px;
    }

    .btn-step {
        width: 100%;
        margin-left: 0 !important;
    }
}