/* 全局样式重置与基础配置 */
:root {
    --primary-color: #0d6efd;
    --primary-light: #e7f1ff;
    --primary-dark: #0a58ca;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
    --transition-base: all 0.3s ease;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;
}

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

body {
    background-color: #f5f7fa;
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
    font-size: 0.9375rem;
    color: var(--dark-color);
    line-height: 1.6;
    min-height: 100vh;
    padding: 0;
    margin: 0;
}

/* 注册容器样式 */
.register-container {
    min-height: calc(100vh - 100px); /* 减去导航栏高度 */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    margin-bottom: 80px;
}

/* 注册卡片样式 */
.register-card {
    background-color: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow-hover);
    overflow: hidden;
    max-width: 480px;
    width: 100%;
    transition: var(--transition-base);
    margin-bottom: 22px;
}

.register-card:hover {
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.15);
}

.register-card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: 2rem;
    text-align: center;
}

.register-card-header .logo {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.register-card-header h3 {
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.register-card-header p {
    opacity: 0.9;
    margin: 0;
}

.register-card-body {
    padding: 2rem;
}

/* 表单控件样式 */
.form-control-custom {
    border: 1px solid #e0e0e0;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    transition: var(--transition-base);
    background-color: #fff;
}

.form-control-custom:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.1);
}

.form-label {
    font-weight: 500;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

/* 错误提示样式 */
.error-tip {
    display: none;
    color: var(--danger-color);
    font-size: 0.8125rem;
    margin-top: 0.25rem;
    line-height: 1.4;
}

.error-tip.server-error {
    display: block;
}

/* 密码输入组样式 */
.password-input-group {
    position: relative;
}

.password-toggle-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--secondary-color);
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 按钮样式 */
.btn-custom {
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    padding: 0.75rem 1.5rem;
    transition: var(--transition-base);
    font-weight: 500;
    border: none;
    width: 100%;
}

.btn-primary.btn-custom {
    background-color: var(--primary-color);
}

.btn-primary.btn-custom:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

/* 协议勾选样式 */
.protocol-check {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    color: var(--secondary-color);
}

.protocol-check .form-check-input {
    margin-top: 0.25rem;
    margin-right: 0.5rem;
}

.protocol-link {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-base);
    cursor: pointer;
}

.protocol-link:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

/* 登录链接 */
.login-link {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.875rem;
    color: var(--secondary-color);
}

.login-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-base);
}

.login-link a:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

/* 响应式样式 */
@media (max-width: 575.98px) {
    .register-card-body {
        padding: 1.5rem;
    }

    .register-card-header {
        padding: 1.5rem;
    }

    .protocol-check {
        gap: 0.5rem;
    }
}

/* 加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.register-card {
    animation: fadeIn 0.5s ease forwards;
}

/* 昵称输入提示 */
.nickname-tip {
    font-size: 0.8125rem;
    color: var(--secondary-color);
    margin-top: 0.25rem;
}

/* PDF模态框样式 */
.pdf-modal .modal-dialog {
    max-width: 95%;
    max-height: 95vh;
    height: 95vh;
    margin: 1vh auto;
}

.pdf-modal .modal-content {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.pdf-modal .modal-header {
    border-bottom: 1px solid #e9ecef;
    padding: 1rem 1.5rem;
}

.pdf-modal .modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.pdf-modal .modal-body {
    flex: 1;
    padding: 0;
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

#pdfViewer {
    width: 100%;
    flex: 1;
    overflow: auto;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 1rem;
    background-color: #f5f5f5;
}

.pdf-canvas-container {
    display: inline-block;
    /* 防止高清缩放后模糊 */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

#pdfCanvas {
    /* 高清渲染优化 */
    max-width: 100%;
    height: auto !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.pdf-loading {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.8);
    z-index: 10;
}

.pdf-error {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--danger-color);
    padding: 2rem;
    text-align: center;
}

.pdf-error i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

/* PDF控制栏样式 */
.pdf-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1rem;
    border-top: 1px solid #e9ecef;
    background-color: #f8f9fa;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.pdf-controls .btn {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.pdf-page-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.pdf-page-input {
    width: 60px;
    padding: 0.25rem 0.5rem;
    border: 1px solid #ced4da;
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 0.875rem;
}

.pdf-page-input:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.1);
}

.pdf-separator {
    color: var(--secondary-color);
    margin: 0 0.25rem;
}

/* 缩放控制样式 */
.pdf-zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.zoom-btn {
    width: 30px;
    height: 30px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.zoom-level {
    min-width: 60px;
    text-align: center;
    font-size: 0.875rem;
}