/* ==============================
   1. 全局重置与基础样式
   ============================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', 'SimSun', sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* ==============================
   2. 公共组件样式 (两个页面共用)
   ============================== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1.05rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #28a745;
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.2);
}

.btn {
    display: block;
    width: 100%;
    background: linear-gradient(to right, #28a745, #218838);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
}

.btn:hover {
    background: linear-gradient(to right, #218838, #1e7e34);
    transform: translateY(-2px);
}

.footer {
    text-align: center;
    padding: 20px 30px;
    color: #777;
    border-top: 1px solid #eee;
    font-size: 0.9rem;
}

.alert {
    padding: 12px 15px;
    margin-bottom: 20px;
    border-radius: 6px;
    font-size: 0.95rem;
}

.alert-danger {
    background-color: #ffebee;
    color: #c62828;
    border: 1px solid #ffcdd2;
}

.alert-success {
    background-color: #e8f5e9;
    color: #388e3c;
    border: 1px solid #c8e6c9;
}

/* ==============================
   3. 登录页专属样式 (Login)
   ============================== */
.login-container {
    width: 100%;
    max-width: 480px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.login-header {
    background: linear-gradient(135deg, #28a745 0%, #218838 100%);
    color: white;
    padding: 35px 30px;
    text-align: center;
}

.login-header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.login-header p {
    font-size: 1.1rem;
    opacity: 0.9;
    letter-spacing: 0.5px;
}

.login-form {
    padding: 35px 30px;
}

.switch-link {
    text-align: center;
    margin-top: 15px;
    padding: 10px 0;
    border-top: 1px solid #eee;
}

.switch-link a {
    color: #28a745;
    text-decoration: none;
    font-weight: 500;
}

.switch-link a:hover {
    text-decoration: underline;
}

.register-link {
    text-align: center;
    margin-top: 15px;
}

.register-link a {
    color: #007bff;
    text-decoration: none;
    font-weight: 500;
}

.register-link a:hover {
    text-decoration: underline;
}

/* ==============================
   4. 注册页专属样式 (Register)
   ============================== */
.register-container {
    width: 100%;
    max-width: 500px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.register-header {
    background: linear-gradient(135deg, #28a745 0%, #218838 100%);
    color: white;
    padding: 35px 30px;
    text-align: center;
}

.register-header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.register-header p {
    font-size: 1.1rem;
    opacity: 0.9;
    letter-spacing: 0.5px;
}

.register-form {
    padding: 35px 30px;
}

.row {
    display: flex;
    gap: 15px;
}

.col-6 {
    flex: 1;
}

/* ✅ 返回患者登录链接 */
.back-link {
    text-align: center;
    margin-top: 15px;
    padding: 10px 0;
    border-top: 1px solid #eee;
}

.back-link a {
    color: #28a745;
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    padding: 5px 10px;
    transition: color 0.3s;
}

.back-link a:hover {
    text-decoration: underline;
    color: #218838;
}

/* 内联样式补充：确保警告文字醒目 */
.username-warning {
    font-size: 0.85rem;
    color: #dc3545; /* Bootstrap danger color */
    margin-top: 5px;
    display: block;
}
.username-hint {
    font-size: 0.8rem;
    color: #6c757d;
    margin-top: 2px;
    display: block;
}
/* 如果输入不合法，边框变红 */
.is-invalid-custom {
    border-color: #dc3545;
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23dc3545'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23dc3545' stroke='none'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}


/* =========================================
   5.响应式适配增强版：平板 & 手机（登录+注册共用）
   ========================================= */

/* 📱 平板适配 (≤ 992px) */
@media screen and (max-width: 992px) {
    body { padding: 30px 20px; }

    .login-container { max-width: 460px; }
    .register-container { max-width: 480px; }

    .login-header, .register-header { padding: 30px 25px; }
    .login-header h1, .register-header h1 { font-size: 2rem; }
    .login-header p, .register-header p { font-size: 1rem; }

    .login-form, .register-form { padding: 30px 25px; }
}

/* 📱 小平板 & 大手机 (≤ 768px) */
@media screen and (max-width: 768px) {
    body {
        padding: 20px 15px;
        align-items: flex-start; /* ⭐ 防止软键盘弹出时内容被挤出视口 */
    }

    .login-container, .register-container {
        max-width: 100%;
        border-radius: 12px;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
    }

    .login-header, .register-header { padding: 25px 20px; }
    .login-header h1, .register-header h1 { font-size: 1.6rem; margin-bottom: 8px; }
    .login-header p, .register-header p { font-size: 0.95rem; }

    .login-form, .register-form { padding: 25px 20px; }

    .form-group { margin-bottom: 18px; }
    .form-group label { font-size: 0.95rem; margin-bottom: 6px; }

    /* ⭐ 防止 iOS Safari 点击输入框自动缩放 */
    .form-control {
        padding: 12px 14px;
        font-size: 16px !important;
    }

    .btn {
        padding: 12px;
        font-size: 1rem;
    }
    .btn:hover { transform: none; } /* 禁用 hover 动画防 iOS 粘滞 */

    /* ⭐ 注册页双列堆叠后补充间距 */
    .row { flex-direction: column; gap: 0; }
    .col-6 { width: 100%; }
    .row .form-group { margin-bottom: 18px; }

    .alert { padding: 10px 14px; font-size: 0.9rem; }
    .footer { padding: 15px 20px; font-size: 0.85rem; }

    .switch-link, .register-link, .back-link {
        margin-top: 12px;
        padding: 8px 0;
    }
    .switch-link a, .register-link a, .back-link a {
        font-size: 0.9rem;
        padding: 6px;
        display: inline-block; /* 增大链接触控热区 */
    }
}

/* 📱 手机适配 (≤ 480px) */
@media screen and (max-width: 480px) {
    body {
        padding: 0;
        background: white; /* 移除渐变背景，减少小屏渲染开销 */
        min-height: 100dvh; /* 动态视口高度，适配移动端地址栏收缩 */
    }

    .login-container, .register-container {
        border-radius: 0;
        box-shadow: none;
        min-height: 100dvh;
        display: flex;
        flex-direction: column;
    }

    .login-header, .register-header {
        padding: 40px 20px 25px; /* 顶部预留安全区 */
        flex-shrink: 0;
    }
    .login-header h1, .register-header h1 { font-size: 1.5rem; }
    .login-header p, .register-header p { font-size: 0.85rem; letter-spacing: 0.3px; }

    .login-form, .register-form {
        padding: 20px;
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: center; /* ⭐ 表单内容垂直居中，避免贴顶 */
    }

    .form-group { margin-bottom: 20px; }
    .form-group label { font-size: 0.9rem; }
    .form-control {
        padding: 14px 15px; /* 增大触控热区 */
        border-radius: 10px;
    }

    .btn {
        padding: 15px;
        font-size: 1.05rem;
        border-radius: 10px;
        margin-top: 10px;
    }

    .alert {
        padding: 12px 15px;
        font-size: 0.85rem;
        border-radius: 8px;
    }

    .switch-link, .register-link, .back-link {
        flex-shrink: 0;
        margin-top: 15px;
    }
    .switch-link a, .register-link a, .back-link a {
        font-size: 0.95rem;
        padding: 10px;
    }

    .footer {
        padding: 15px 20px;
        font-size: 0.75rem;
        flex-shrink: 0;
    }
}