/* 登录页面样式 - 与index.html保持一致 */

/* 引入CSS变量 */
:root {
    /* 主色板 - 用于主要操作、品牌展示 */
    --primary-900: #1E3A8A;
    --primary-800: #1E40AF;
    --primary-700: #1D4ED8;
    --primary-600: #2563EB;
    --primary-500: #3B82F6;
    --primary-400: #60A5FA;
    --primary-300: #93C5FD;
    --primary-200: #BFDBFE;
    --primary-100: #DBEAFE;
    --primary-50:  #EFF6FF;

    /* 中性色板 - 用于文字、边框、背景 */
    --gray-900: #111827;
    --gray-800: #1F2937;
    --gray-700: #374151;
    --gray-600: #4B5563;
    --gray-500: #6B7280;
    --gray-400: #9CA3AF;
    --gray-300: #D1D5DB;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --gray-50:  #F9FAFB;

    /* 字体 */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
                        Helvetica, Arial, sans-serif;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* 间距 */
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-6: 24px;
}

body {
    background: linear-gradient(135deg, #1E40AF 0%, #2563EB 50%, #3B82F6 100%);
    font-family: var(--font-family-base);
    min-height: 100vh;
}

.min-vh-100 {
    min-height: 100vh;
}

/* 登录卡片样式 */
.card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    transition: box-shadow 0.3s ease;
    background: #FFFFFF;
    animation: cardEnter 0.5s ease-out;
    overflow: hidden;
}

.card:hover {
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.2);
}

@keyframes cardEnter {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.card-header {
    border-radius: 12px 12px 0 0 !important;
    border-bottom: 1px solid var(--gray-100);
    background: #FFFFFF !important;
    color: var(--gray-900) !important;
}

.card-header .logo-container {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #2563EB, #3B82F6);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: #FFFFFF;
    margin: 0 auto var(--space-4);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
    animation: logoPulse 2s ease-in-out infinite;
}

@keyframes logoPulse {
    0%, 100% {
        box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
    }
    50% {
        box-shadow: 0 8px 32px rgba(37, 99, 235, 0.5);
    }
}

.card-header h3 {
    font-weight: var(--font-bold);
    font-size: 18px;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.card-header p {
    font-size: 14px;
    color: var(--gray-500);
    margin: 0;
}

/* 表单样式 */
.form-control {
    border-radius: 10px;
    border: 1px solid var(--gray-300);
    padding: 14px 16px;
    font-size: 15px;
    transition: all 0.2s ease;
    color: var(--gray-900);
    background: #FFFFFF;
}

.form-control:hover {
    border-color: #D1D5DB;
}

.form-control:focus {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-control::placeholder {
    color: var(--gray-400);
}

.form-label {
    font-weight: var(--font-medium);
    color: var(--gray-700);
    margin-bottom: 8px;
    font-size: 14px;
}

.form-label i {
    color: var(--gray-500);
}

/* 按钮样式 */
.btn {
    border-radius: 10px;
    padding: 14px 24px;
    font-weight: var(--font-semibold);
    transition: all 0.2s ease;
    border: none;
    font-size: 16px;
}

.btn-primary {
    background: #2563EB;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
    background: #1D4ED8;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.btn-outline-secondary {
    border: 1px solid var(--gray-300);
    color: var(--gray-600);
    background: #FFFFFF;
}

.btn-outline-secondary:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    color: var(--gray-700);
}

/* 密码显示/隐藏按钮 */
#togglePassword {
    border-left: none;
    border-radius: 0 6px 6px 0;
}

.input-group .form-control:not(:first-child) {
    border-left: none;
    border-radius: 6px 0 0 6px;
}

/* 记住我复选框 */
.form-check-input {
    margin-top: 0.3em;
    border-color: var(--gray-300);
}

.form-check-input:checked {
    background-color: var(--primary-600);
    border-color: var(--primary-600);
}

.form-check-label {
    color: var(--gray-600);
    font-size: 14px;
}

/* 提示信息 - 卡片底部提示区 */
.login-hint {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: #F0F9FF;
    border-top: 1px solid #E0F2FE;
    font-size: 13px;
    color: #0369A1;
}

.login-hint i {
    color: #0EA5E9;
    font-size: 16px;
}

.login-hint strong {
    font-weight: 600;
}

/* 底部版权 */
.text-footer {
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
}

.text-footer i {
    color: rgba(255, 255, 255, 0.7);
}

/* 复选框自定义样式 */
.form-check-input {
    width: 18px;
    height: 18px;
    margin-top: 0.2em;
    border: 2px solid var(--gray-300);
    border-radius: 4px;
    cursor: pointer;
    accent-color: var(--primary-600);
    transition: all 0.2s ease;
}

.form-check-input:checked {
    background-color: var(--primary-600);
    border-color: var(--primary-600);
}

.form-check-label {
    color: var(--gray-700);
    font-size: 14px;
    cursor: pointer;
    user-select: none;
    padding-left: 4px;
}

/* 错误提示 */
.error-message {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    margin-bottom: 16px;
    background: #FEE2E2;
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 8px;
    font-size: 13px;
    color: #EF4444;
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-4px); }
    40%, 80% { transform: translateX(4px); }
}

/* 响应式适配 */
@media (max-width: 640px) {
    body {
        background: #FFFFFF;
    }
    
    .card {
        box-shadow: none;
        border-radius: 0;
    }
    
    .text-footer {
        color: var(--gray-500);
    }
    
    .text-footer i {
        color: var(--gray-500);
    }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .card {
        margin: 20px;
        border-radius: 10px;
    }
    
    .card-header {
        border-radius: 10px 10px 0 0 !important;
    }
    
    .form-control {
        padding: 10px 12px;
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    .btn {
        padding: 10px 20px;
    }
}

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

.card {
    animation: fadeIn 0.6s ease-out;
}

/* 加载动画 */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* 提示信息样式 */
.alert {
    border: none;
    border-radius: 8px;
    font-size: 13px;
}

.alert-info {
    background-color: #e3f2fd;
    color: #1976d2;
    border-left: 4px solid #1976d2;
}

/* 页脚样式 */
.text-muted {
    font-size: 12px;
    opacity: 0.7;
}

/* 图标美化 */
.fa-graduation-cap {
    color: rgba(255, 255, 255, 0.9);
}

.fa-user, .fa-lock {
    color: #6c757d;
}

/* 表单验证样式 */
.was-validated .form-control:valid {
    border-color: #28a745;
}

.was-validated .form-control:invalid {
    border-color: #dc3545;
}

.invalid-feedback {
    font-size: 12px;
    margin-top: 5px;
}

/* 背景渐变 */
body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
}

/* 响应式容器 */
.container-fluid {
    padding: 20px;
}

@media (max-width: 576px) {
    .container-fluid {
        padding: 10px;
    }
}