/* 全局样式 - 默认暗黑模式 */
:root {
    --primary-color: #0a192f;
    --secondary-color: #64ffda;
    --text-primary: #ccd6f6;
    --text-secondary: #8892b0;
    --white: #e6f1ff;
    --bg-color: #0a192f;
    --card-bg: rgba(10, 25, 47, 0.8);
    --footer-bg: #020c1b;
    --news-bg: rgba(100, 255, 218, 0.03);
    --link-card-bg: rgba(100, 255, 218, 0.05);
    --header-bg: rgba(10, 25, 47, 0.9);
    
    /* 新增渐变和阴影 */
    --gradient-primary: linear-gradient(135deg, #0a192f 0%, #112240 100%);
    --card-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
    --btn-hover-shadow: 0 5px 15px rgba(100, 255, 218, 0.3);
}

/* 亮色模式 */
[data-theme="light"] {
    --primary-color: #f8f9fa;
    --secondary-color: #007bff;
    --text-primary: #212529;
    --text-secondary: #495057;
    --white: #ffffff;
    --bg-color: #f8f9fa;
    --card-bg: rgba(255, 255, 255, 0.9);
    --footer-bg: #e9ecef;
    --news-bg: rgba(0, 123, 255, 0.03);
    --link-card-bg: rgba(0, 123, 255, 0.05);
    --header-bg: rgba(248, 249, 250, 0.9);
    
    /* 新增亮色模式渐变和阴影 */
    --gradient-primary: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    --card-shadow: 0 10px 30px -15px rgba(0, 0, 0, 0.1);
    --btn-hover-shadow: 0 5px 15px rgba(0, 123, 255, 0.2);
}

* {
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

body {
    background: var(--gradient-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: var(--secondary-color);
    transition: all 0.3s ease;
}

a:hover {
    color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 卡片样式升级 */
.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(100, 255, 218, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

[data-theme="light"] .card {
    border: 1px solid rgba(0, 123, 255, 0.1);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 30px -15px rgba(2, 12, 27, 0.8);
}

[data-theme="light"] .card:hover {
    box-shadow: 0 20px 30px -15px rgba(0, 0, 0, 0.15);
}

/* 按钮样式升级 */
.btn {
    display: inline-block;
    padding: 12px 28px;
    background: transparent;
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0%;
    height: 100%;
    background: var(--secondary-color);
    transition: all 0.3s ease;
    z-index: -1;
    opacity: 0.1;
}

.btn:hover {
    background: rgba(100, 255, 218, 0.1);
    transform: translateY(-3px);
    box-shadow: var(--btn-hover-shadow);
}

.btn:hover::before {
    width: 100%;
}

[data-theme="light"] .btn:hover {
    background: rgba(0, 123, 255, 0.1);
}

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 20px 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--secondary-color);
}

.logo img {
    width: auto;
    height: 50px;
}

/* 汉堡菜单按钮 */
.hamburger {
    display: none;
    cursor: pointer;
    width: 30px;
    height: 21px;
    position: relative;
    z-index: 1001;
    background: none;
    border: none;
    padding: 0;
}

.hamburger span {
    display: block;
    position: absolute;
    height: 3px;
    width: 100%;
    background: var(--text-primary);
    border-radius: 3px;
    opacity: 1;
    left: 0;
    transform: rotate(0deg);
    transition: .25s ease-in-out;
}

.hamburger span:nth-child(1) {
    top: 0;
}

.hamburger span:nth-child(2),
.hamburger span:nth-child(3) {
    top: 9px;
}

.hamburger span:nth-child(4) {
    top: 18px;
}

.hamburger.open span:nth-child(1) {
    top: 9px;
    width: 0%;
    left: 50%;
}

.hamburger.open span:nth-child(2) {
    transform: rotate(45deg);
}

.hamburger.open span:nth-child(3) {
    transform: rotate(-45deg);
}

.hamburger.open span:nth-child(4) {
    top: 9px;
    width: 0%;
    left: 50%;
}

/* 主题切换开关 */
.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
    margin-left: 20px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--secondary-color);
}

input:checked + .slider:before {
    transform: translateX(30px);
}

.slider .icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    color: white;
}

.slider .moon {
    left: 8px;
}

.slider .sun {
    right: 8px;
}

/* 移动端导航菜单 */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 80px 30px 30px;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.mobile-nav.open {
    right: 0;
}

.mobile-nav-links {
    list-style: none;
}

.mobile-nav-links li {
    margin-bottom: 20px;
}

.mobile-nav-links a {
    color: var(--text-primary);
    font-size: 18px;
    display: block;
    padding: 10px 0;
}

.mobile-nav-links a:hover {
    color: var(--secondary-color);
}

.mobile-theme-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--text-secondary);
}

.mobile-theme-toggle span {
    color: var(--text-primary);
    font-size: 16px;
}

/* 模态框样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-content {
    background: var(--card-bg);
    width: 100%;
    max-width: 500px;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    position: relative;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-title {
    font-size: 24px;
    margin-bottom: 25px;
    color: var(--secondary-color);
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    z-index: 1001;
}

.close-btn:hover {
    color: var(--secondary-color);
}

/* 步骤指示器升级 */
.steps {
    display: flex;
    margin-bottom: 25px;
    justify-content: center;
    gap: 40px;
}

.step {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--text-secondary);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    position: relative;
    transition: all 0.3s ease;
}

.step.active {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: scale(1.2);
    box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.3);
}

[data-theme="light"] .step.active {
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.3);
}

.step::before {
    content: '';
    position: absolute;
    width: 40px;
    height: 2px;
    background: var(--text-secondary);
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
}

.step:first-child::before {
    display: none;
}

/* 页脚 */
footer {
    background: var(--footer-bg);
    padding: 50px 0 20px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    list-style: none;
    margin-bottom: 30px;
}

.footer-links li {
    margin: 0 15px;
}

.copyright {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 加载状态 */
.loading-spinner {
    text-align: center;
    padding: 40px;
    grid-column: 1 / -1;
    color: var(--secondary-color);
    font-size: 18px;
}

.loading-spinner i {
    margin-right: 10px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    color: #ff6b6b;
    text-align: center;
    padding: 20px;
    grid-column: 1 / -1;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

/* 响应式设计 */
@media (max-width: 992px) {
    .nav-links {
        display: none;
    }
    
    .hamburger {
        display: block;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding-bottom: 50px;
        min-height: calc(100vh - 160px);
    }
    
    .page-title {
        font-size: 28px;
    }
    
    .card {
        padding: 20px;
    }
    
    .modal-content {
        width: 90%;
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .theme-switch {
        width: 50px;
        height: 25px;
        margin-left: 15px;
    }
    
    .slider:before {
        height: 18px;
        width: 18px;
        bottom: 3.5px;
        left: 3.5px;
    }
    
    input:checked + .slider:before {
        transform: translateX(25px);
    }
    
    .slider .icon {
        font-size: 12px;
    }
}

/* 表单样式升级 - 浮动标签效果 */
.form-group {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 25px;
}

.form-group label {
    flex-shrink: 0;
    width: 80px;
    text-align: right;
    margin-right: 10px;
}

.form-group input,
.form-group select,
.form-group textarea {
    flex-grow: 1;
    width: 100%;
    padding: 15px;
    border: 1px solid var(--text-secondary);
    border-radius: 8px;
    background: transparent;
    color: var(--text-primary);
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--secondary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.2);
}

[data-theme="light"] .form-group input:focus,
[data-theme="light"] .form-group select:focus,
[data-theme="light"] .form-group textarea:focus {
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
}

.form-group textarea {
    height: 100px;
    resize: vertical;
    min-height: 80px;
}

.form-group input::placeholder {
    color: var(--text-secondary);
    font-style: italic;
    transition: opacity 0.3s ease;
}

.form-group input:focus::placeholder {
    opacity: 0.6;
}

.example {
    display: block;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    clear: both;
}

/* 表单控件图标 */
.input-icon {
    position: relative;
}

.input-icon i {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.input-icon input:focus + i {
    color: var(--secondary-color);
}

/* 输入框状态样式 */
.input-success {
    border-color: #28a745;
}

.input-error {
    border-color: #dc3545;
}

.input-success:focus,
.input-error:focus {
    box-shadow: 0 0 0 2px rgba(40, 167, 69, 0.2), 0 0 0 4px #28a745;
}

[data-theme="light"] .input-success:focus,
[data-theme="light"] .input-error:focus {
    box-shadow: 0 0 0 2px rgba(40, 167, 69, 0.15), 0 0 0 4px #28a745;
}

/* 表单动作区域 */
.form-actions {
    margin-top: 30px;
    text-align: right;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .form-actions {
        margin-top: 20px;
        text-align: center;
    }
}

/* 密码强度提示 */
.password-strength {
    margin-top: 8px;
    height: 6px;
    border-radius: 3px;
    background: var(--text-secondary);
    overflow: hidden;
}

.password-strength-bar {
    height: 100%;
    width: 0%;
    background: #ffc107;
    transition: width 0.3s ease, background 0.3s ease;
}

.password-strength-bar.medium {
    background: #28a745;
}

.password-strength-bar.strong {
    background: #17a2b8;
}

/* 验证码按钮 */
.verification-code-btn {
    background: var(--secondary-color);
    color: var(--primary-color);
    border: none;
    border-radius: 4px;
    padding: 8px 15px;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.verification-code-btn:hover {
    opacity: 0.9;
}

.verification-code-btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 提交确认弹窗样式 */
#confirmDetails {
    background: rgba(10, 25, 47, 0.3);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.confirm-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.confirm-label {
    color: var(--text-secondary);
    width: 120px;
}

.confirm-value {
    font-weight: 500;
}

/* 新增：表单网格布局 */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .form-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .form-group label {
        width: 100%;
        text-align: left;
        margin-bottom: 8px;
    }
}

@media (max-width: 768px) {
    .page-title {
        font-size: 2rem;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
}