/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-color);
}

/* 登录页面样式 */
.login-page {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 440px;
}

.login-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    animation: slideIn 0.3s ease-out;
}

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

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    font-size: 48px;
    margin-bottom: 16px;
}

.logo img {
    display: block;
    margin: 0 auto;
    width: 96px;
    height: 96px;
    object-fit: contain;
}

.login-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

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

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="password"] {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.captcha-group {
    display: flex;
    gap: 12px;
    align-items: center;
}

.captcha-image {
    flex: 1;
    height: 60px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f9fafb;
    overflow: hidden;
    cursor: pointer;
    transition: border-color 0.2s;
}

.captcha-image:hover {
    border-color: var(--primary-color);
}

.captcha-image img {
    max-width: 100%;
    max-height: 100%;
    display: block;
}

.captcha-loading {
    color: var(--text-secondary);
    font-size: 13px;
}

.btn-refresh {
    width: 48px;
    height: 48px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: white;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-refresh:hover {
    border-color: var(--primary-color);
    background: #f9fafb;
    transform: rotate(180deg);
}

.btn-primary {
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

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

.btn-primary .spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.error-message,
.success-message {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    animation: fadeIn 0.3s ease-out;
}

.error-message {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.success-message {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.login-footer {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.login-footer p {
    color: var(--text-secondary);
    font-size: 13px;
}

.login-footer code {
    background: #f3f4f6;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
    font-size: 12px;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .login-card {
        padding: 24px;
    }

    .login-header h1 {
        font-size: 24px;
    }

    .logo {
        font-size: 40px;
    }
}