/* ==========================================
   登录页面 - 全新设计
   ========================================== */

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-hover: #5568d3;
    --secondary-color: #764ba2;
    --text-dark: #1a1a2e;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 24px 48px rgba(102, 126, 234, 0.25);
}

/* 页面整体布局 */
.login-wrapper {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
    position: relative;
    overflow: hidden;
}

/* 动态背景 */
.login-wrapper::before {
    content: '';
    position: absolute;
    top: -10%;
    right: -10%;
    width: 50%;
    height: 50%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

.login-wrapper::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -10%;
    width: 40%;
    height: 40%;
    background: radial-gradient(circle, rgba(118, 75, 162, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(0, 0) scale(1); }
    75% { transform: translate(-30px, 30px) scale(0.95); }
}

/* 功能展示区 */
.feature-showcase {
    display: none;
}

/* 登录容器 */
.login-section {
    width: 100%;
    max-width: 480px;
    position: relative;
    z-index: 1;
}

.login-container {
    background: var(--bg-white);
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 登录头部 */
.login-header {
    padding: 3rem 2.5rem 2rem;
    text-align: center;
    position: relative;
    background: linear-gradient(180deg, rgba(102, 126, 234, 0.03) 0%, transparent 100%);
}

.login-header .login-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    background: var(--primary-gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    box-shadow: var(--shadow-md);
    animation: iconFloat 3s ease-in-out infinite;
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.login-header .login-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 0.5rem;
    letter-spacing: -0.5px;
}

.login-header .login-subtitle {
    font-size: 0.95rem;
    color: var(--text-gray);
    margin: 0;
    font-weight: 400;
}

/* 登录主体 */
.login-body {
    padding: 0 2.5rem 2.5rem;
}

/* 表单样式 */
.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    position: relative;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.form-group input {
    width: 100%;
    padding: 1rem 1rem 1rem 2.75rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.form-group input::placeholder {
    color: var(--text-light);
    opacity: 0.8;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-white);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1), var(--shadow-md);
}

.form-group input:hover:not(:focus) {
    border-color: #cbd5e1;
    background: var(--bg-white);
}

.form-group .input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: 1.125rem;
    pointer-events: none;
    transition: color 0.3s ease;
}

.form-group input:focus + .input-icon {
    color: var(--primary-color);
}

/* 密码切换按钮 */
.password-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.password-toggle:hover {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

/* 记住我区域 */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.form-check input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin: 0;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.form-check label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-gray);
    cursor: pointer;
    margin: 0;
}

.forgot-password {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.2s ease;
}

.forgot-password:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* 登录按钮 */
.btn-login {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--primary-gradient);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    margin-top: 0.75rem;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-login:hover::before {
    left: 100%;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.35);
}

.btn-login:active {
    transform: translateY(0);
}

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

/* 登录底部 */
.login-footer {
    padding: 2rem 2.5rem;
    text-align: center;
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    font-size: 0.875rem;
    color: var(--text-gray);
    margin: 0;
}

.login-footer a {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
}

.login-footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* 错误提示 */
.alert {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: none;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
}

.alert-danger i {
    color: #dc2626;
}

.alert-dismissible .btn-close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    padding: 0.25rem;
}

/* 模态框样式 */
.modal.show {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

.modal-content {
    border-radius: 20px;
    border: none;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border: none;
    padding: 1.5rem 2rem;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-weight: 700;
    color: var(--text-dark);
}

.modal-body {
    padding: 2rem;
}

.modal-footer {
    border: none;
    padding: 1.5rem 2rem;
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-wrapper {
        padding: 1.5rem;
    }

    .login-header {
        padding: 2rem 1.5rem 1.5rem;
    }

    .login-body {
        padding: 0 1.5rem 1.5rem;
    }

    .login-footer {
        padding: 1.5rem;
    }

    .login-header .login-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .login-wrapper {
        padding: 1rem;
    }

    .login-header {
        padding: 1.5rem 1.25rem 1.25rem;
    }

    .login-body {
        padding: 0 1.25rem 1.25rem;
    }

    .login-footer {
        padding: 1.25rem;
    }

    .form-group input {
        padding: 0.875rem 0.875rem 0.875rem 2.5rem;
        font-size: 0.95rem;
    }

    .login-header .login-title {
        font-size: 1.375rem;
    }

    .login-header .login-icon {
        width: 56px;
        height: 56px;
        font-size: 24px;
    }
}