/* 全局样式 - 移动端优先 */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 容器 */
.container {
    max-width: 100%;
    padding: 0 15px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .container {
        max-width: 750px;
    }
}

@media (min-width: 992px) {
    .container {
        max-width: 970px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}

/* 头部导航 */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 1.25rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.nav-menu a:hover {
    opacity: 0.8;
}

/* 移动端导航切换 */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(102, 126, 234, 0.95);
        flex-direction: column;
        padding: 1rem;
        gap: 0.5rem;
    }

    .nav-menu.active {
        display: flex;
    }
}

/* 底部 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 2rem 0 1rem;
    margin-top: 3rem;
}

.footer-content {
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.copyright {
    color: #95a5a6;
    font-size: 0.875rem;
    margin-top: 1rem;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    line-height: 1.5;
    min-height: 2.75rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-outline {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
}

/* 标签样式 */
.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: #e3f2fd;
    color: #1976d2;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    margin-right: 0.5rem;
    margin-bottom: 0.25rem;
}

.tag-success {
    background: #e8f5e8;
    color: #2e7d32;
}

.tag-warning {
    background: #fff3e0;
    color: #f57c00;
}

.tag-danger {
    background: #ffebee;
    color: #c62828;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #495057;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: white;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-control::placeholder {
    color: #6c757d;
}

select.form-control {
    cursor: pointer;
}

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

/* 输入行 */
.input-row {
    margin-bottom: 1rem;
}

.input-row label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #495057;
}

.input-row input,
.input-row select,
.input-row textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.input-row input:focus,
.input-row select:focus,
.input-row textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

/* 双列布局 */
.double-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 768px) {
    .double-col {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

.col {
    display: flex;
    flex-direction: column;
}

/* 提示信息 */
.privacy-tip,
.security-tip {
    font-size: 0.875rem;
    color: #6c757d;
    margin-top: 0.5rem;
    padding-left: 1rem;
    border-left: 3px solid #e9ecef;
}

.security-tip {
    color: #856404;
    background-color: #fff3cd;
    border-left-color: #ffc107;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
}

/* 分割线 */
.divider {
    height: 1px;
    background: #e9ecef;
    margin: 2rem 0;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 2rem;
    color: #6c757d;
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
}

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

/* 工具类 */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.text-muted {
    color: #6c757d !important;
}

.text-primary {
    color: #667eea !important;
}

.text-success {
    color: #28a745 !important;
}

.text-warning {
    color: #ffc107 !important;
}

.text-danger {
    color: #dc3545 !important;
}

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 0.25rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.mb-5 { margin-bottom: 3rem !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: 0.25rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mt-5 { margin-top: 3rem !important; }

.p-0 { padding: 0 !important; }
.p-1 { padding: 0.25rem !important; }
.p-2 { padding: 0.5rem !important; }
.p-3 { padding: 1rem !important; }
.p-4 { padding: 1.5rem !important; }
.p-5 { padding: 3rem !important; }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }

.justify-content-center {
    justify-content: center !important;
}

.align-items-center {
    align-items: center !important;
}

.flex-column {
    flex-direction: column !important;
}

/* 响应式工具类 */
@media (max-width: 576px) {
    .d-sm-none { display: none !important; }
    .d-sm-block { display: block !important; }
}

@media (max-width: 768px) {
    .d-md-none { display: none !important; }
    .d-md-block { display: block !important; }
}

@media (max-width: 992px) {
    .d-lg-none { display: none !important; }
    .d-lg-block { display: block !important; }
}

/* 动画 */
.pulse-anim {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* 骨架屏 */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
    border-radius: 4px;
}

.skeleton-text:last-child {
    width: 80%;
}